subject:( Unstructured Grids)

NSYSU

1. Hung, Sheng-Tang. A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay.

Degree: Master, Marine Environment and Engineering, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1007113-134156

► Coastal lagoon is tend to encounter some impact of disturbance especially in rainfall events. During the heavy rain, the nutrients may transport from landside to… (more)

▼ Coastal lagoon is tend to encounter some impact of disturbance especially in rainfall events. During the heavy rain, the nutrients may transport from landside to lagoon by inflow. The abundance of nutrients may caused ecosystem loss of balance. Dapeng Bay is located in southwestern Taiwan, which is an enclosed shallow coastal lagoon. Recently Dapeng Bay is developing into an international tourist and recreation area by Tourism Bureau, MOTC. In order to study the water quality and ecosystem impact after the develoment projects, we established a high resolution 3-D FEM numerical water dynamical model by using unstructured grids, and the model is not only coupled with biology states variables but also using on case studies. Wet and dry seasons are clear seasonal phenomena in southern Taiwan. Heavy rainfall has significant influence on the salinity of surface water, local effects near the two discharges would bring high concentration of nutrients to the territorial water.Therefore, this study is based on the long term observation data. Assuming silicon and phosphorus nutrients are adequate supply, we added both tidal circulation and meteorological factors to simulated the nitrogen base biology simulation. The results show that Dapeng Bay is a nutrients excess area. After we calculated the model results of fluxes of phytoplankton carbon and compared the results to eutrophication standard defined by Nixon, we discovered that the water body of Dapeng Bay has already become eutrophic in the early spring, and it even have phenomena of hypertrophication after the heavy rainfall events. The biological model simulation results are summarized and analyzed that although tidal inlets dredging project and strong wind stress help to improve the water circulation of Dapeng Bay, but the nutrients fluxes of model results show that a large influx of nutrients would still accumulate in Dapeng Bay during the rainfall events. Advisors/Committee Members: Fang-Yin Lee (chair), Jason Yu (committee member), Hao-Cheng Yu (chair).

Subjects/Keywords: Eutrophication; Lagoon; Tidal circulation; Unstructured grids; Biological Model

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hung, S. (2013). A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1007113-134156

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hung, Sheng-Tang. “A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay.” 2013. Thesis, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1007113-134156.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hung, Sheng-Tang. “A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay.” 2013. Web. 02 Mar 2021.

Vancouver:

Hung S. A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1007113-134156.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hung S. A 3-D FEM Numerical Model Using Unstructured Grids to Study Nutrients Circulation in Dapeng Bay. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1007113-134156

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Javadi, Mehran. Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids .

Degree: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper, 2020, Chalmers University of Technology

URL: http://hdl.handle.net/20.500.12380/302147

► Large Eddy Simulation (LES) has become a promising CFD method for flows in which turbulence plays a dominant role such as many complex engineering systems.… (more)

Subjects/Keywords: Computational Fluid Dynamics; WMLES; Unstructured grids; Accuracy; OpenFOAM

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Javadi, M. (2020). Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids . (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/302147

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Javadi, Mehran. “Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids .” 2020. Thesis, Chalmers University of Technology. Accessed March 02, 2021. http://hdl.handle.net/20.500.12380/302147.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Javadi, Mehran. “Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids .” 2020. Web. 02 Mar 2021.

Vancouver:

Javadi M. Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids . [Internet] [Thesis]. Chalmers University of Technology; 2020. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/20.500.12380/302147.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Javadi M. Evaluating the Performance of Wall-Modelled Large-Eddy Simulation on Unstructured Grids . [Thesis]. Chalmers University of Technology; 2020. Available from: http://hdl.handle.net/20.500.12380/302147

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

3. Hunt, Mark Anthony. Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments.

Degree: MS, Aerospace Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10132016-175205/ ;

► The MSU Loci/BLAST CFD code was used to study blast wave interactions with structures for different urban environments. A series of analyses which included… (more)

Subjects/Keywords: shock waves; CFD; blast loads; grids; Loci/BLAST; blast wave; blast analysis; composite; overset; unstructured

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hunt, M. A. (2016). Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10132016-175205/ ;

Chicago Manual of Style (16^th Edition):

Hunt, Mark Anthony. “Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments.” 2016. Masters Thesis, Mississippi State University. Accessed March 02, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10132016-175205/ ;.

MLA Handbook (7^th Edition):

Hunt, Mark Anthony. “Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments.” 2016. Web. 02 Mar 2021.

Vancouver:

Hunt MA. Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Mar 02]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10132016-175205/ ;.

Council of Science Editors:

Hunt MA. Evaluation of unstructured and overset grid methods for blast analysis using Loci/BLAST with emphasis on urban environments. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10132016-175205/ ;

4. Renata Sampaio da Rocha. Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas.

Degree: 2007, Instituto Nacional de Pesquisas Espaciais

URL: http://urlib.net/sid.inpe.br/[email protected]/2007/04.04.17.29

►

O presente trabalho apresenta a especificação de uma biblioteca computacional que está sendo desenvolvida com a finalidade de auxiliar na busca de erros que surgem… (more)

▼

O presente trabalho apresenta a especificação de uma biblioteca computacional que está sendo desenvolvida com a finalidade de auxiliar na busca de erros que surgem durante o desenvolvimento de um modelo numérico. A referida biblioteca mostra cromogramas das variáveis sendo calculadas. Ela é capaz de atualizar os campos calculados em cada iteração, o que é interessante para localização e identificação de possíveis fontes de instabilidades. A especificação foi realizada ao mesmo tempo em que se fez a investigação de vários métodos numéricos para se determinar o mais adequado na modelagem do reator HFCVD utilizado no LAS/INPE. Simulações mostraram que uma alternativa viável para tratamento dos termos difusivos das equações do transporte é a Abordagem Baseada no Circuncentro, já para o acoplamento pressão-velocidade o método que obteve maior êxito foi o método PRIME. A utilização da biblioteca de visualização foi um fator determinante na solução de problemas que surgiram durante a implementação dos métodos numéricos testados.

This work presents the specification of a computational library currently being developed in order to help find the errors that appear during the development of a numerical model. This library shows chromograms of the variable fields being calculated. It is capable to bring up to date the fields calculated in each iteration, this characteristic is interesting for localization and identification of possible sources of instabilities. The specification was carried through at the same time that several numeric methods were tested in order to find which were best suited for modeling the HFCVD reactor being currently utilized in the LAS/INPE. Simulations have shown that circumcenter based approach is a viable alternative for the transport equation diffusive terms modeling and for the pressure-velocity coupling the PRIME method was the best suited. The use of the new visualization library was a determinative factor in the solution of problems that had appeared during the implementation of the tested numerical methods.

Advisors/Committee Members: Haroldo Fraga de Campos Velho, Jerônimo dos Santos Travelho, Helcio Francisco Vila Nova, Maurício Ribeiro Baldan, Sebastião Cardoso, Amilcar Porto Pimenta.

Subjects/Keywords: Computational fluid dynamics; unstructured grids; flow laminar; navier; stokes equation; finite volume method

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rocha, R. S. d. (2007). Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas. (Thesis). Instituto Nacional de Pesquisas Espaciais. Retrieved from http://urlib.net/sid.inpe.br/[email protected]/2007/04.04.17.29

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rocha, Renata Sampaio da. “Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas.” 2007. Thesis, Instituto Nacional de Pesquisas Espaciais. Accessed March 02, 2021. http://urlib.net/sid.inpe.br/[email protected]/2007/04.04.17.29.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rocha, Renata Sampaio da. “Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas.” 2007. Web. 02 Mar 2021.

Vancouver:

Rocha RSd. Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas. [Internet] [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2007. [cited 2021 Mar 02]. Available from: http://urlib.net/sid.inpe.br/[email protected]/2007/04.04.17.29.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rocha RSd. Estudo de métodos numéricos para solução de problemas de fenômenos de transporte em malhas não estruturadas. [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2007. Available from: http://urlib.net/sid.inpe.br/[email protected]/2007/04.04.17.29

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

5. Bosma, S.B.M. (author). A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:f6bce1fc-6843-48fa-9d4f-ac0579449ac9

►

A novel multiscale method for discrete fracture modeling on unstructured grids (MS-DFM) is developed. To this end, the DFM fine-scale discrete system is constructed using… (more)

Subjects/Keywords: multiscale finite volume; unstructured grids; discrete fracture modeling; flow in fractured porous media; algebraic multiscale

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bosma, S. B. M. (. (2017). A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f6bce1fc-6843-48fa-9d4f-ac0579449ac9

Chicago Manual of Style (16^th Edition):

Bosma, S B M (author). “A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids.” 2017. Masters Thesis, Delft University of Technology. Accessed March 02, 2021. http://resolver.tudelft.nl/uuid:f6bce1fc-6843-48fa-9d4f-ac0579449ac9.

MLA Handbook (7^th Edition):

Bosma, S B M (author). “A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids.” 2017. Web. 02 Mar 2021.

Vancouver:

Bosma SBM(. A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02]. Available from: http://resolver.tudelft.nl/uuid:f6bce1fc-6843-48fa-9d4f-ac0579449ac9.

Council of Science Editors:

Bosma SBM(. A Multiscale Finite Volume Method for Discrete Fracture Modeling on Unstructured Grids. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:f6bce1fc-6843-48fa-9d4f-ac0579449ac9

University of Western Ontario

6. DeGroot, Christopher T. Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung.

Degree: 2012, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/655

► Transport in porous media has many practical applications in science and engineering. This work focuses on the development of numerical methods for analyzing porous media… (more)

▼ Transport in porous media has many practical applications in science and engineering. This work focuses on the development of numerical methods for analyzing porous media flows and uses two major applications, metal foams and the human lung, to demonstrate the capabilities of the methods. Both of these systems involve complex pore geometries and typically involve porous domains of complex shape. Such geometric complexities make the characterization of the relevant effective properties of the porous medium as well as the solution of the governing equations in conjugate fluid-porous domains challenging. In porous domains, there are typically too many individual pores to consider transport processes directly; instead the governing equations are volume-averaged to obtain a new sets of governing equations describing the conservation laws in a bulk sense. There are, however, unknown pore-level terms remaining in the volume-averaged equations that must be characterized using effective properties that account for the effects of processes at the pore level. Once closed, the volume-averaged equations can be solved numerically, however currently available numerical methods for conjugate domains do not perform well at fluid-porous interfaces when using unstructured grids. In light of the preceding discussion, the goals of this work are: (i) to develop a finite-volume-based numerical method for solving fluid flow and non-equilibrium heat transfer problems in conjugate fluid-porous domains that is compatible with general unstructured grids, (ii) to characterize the relevant flow and thermal properties of an idealized graphite foam, (iii) to determine the permeability of an alveolated duct, which is considered as a representative element of the respiratory region of the human lung, and (iv) to conduct simulations of airflow in the human lung using a novel fluid-porous description of the domain. Results show that the numerical method that has been developed for conjugate fluid-porous systems is able to maintain accuracy on all grid types, flow directions, and flow speeds considered. This work also introduces a comprehensive set of correlations for the effective properties of graphite foam, which will be useful for studying the performance of devices incorporating this new material. In order to model air flow in the lung as a porous medium, the permeability of an alveolated duct is obtained using direct pore-level simulations. Finally, simulations of air flow in the lung are presented which use a novel fluid-porous approach wherein the upper airways are considered as a pure fluid region and the smaller airways and alveoli are considered as a porous domain.

Subjects/Keywords: porous media; finite volume methods; unstructured grids; thermal dispersion; metal foams; human lung; Applied Mechanics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

DeGroot, C. T. (2012). Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/655

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

DeGroot, Christopher T. “Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung.” 2012. Thesis, University of Western Ontario. Accessed March 02, 2021. https://ir.lib.uwo.ca/etd/655.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

DeGroot, Christopher T. “Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung.” 2012. Web. 02 Mar 2021.

Vancouver:

DeGroot CT. Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung. [Internet] [Thesis]. University of Western Ontario; 2012. [cited 2021 Mar 02]. Available from: https://ir.lib.uwo.ca/etd/655.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

DeGroot CT. Numerical Modelling of Transport in Complex Porous Media: Metal Foams to the Human Lung. [Thesis]. University of Western Ontario; 2012. Available from: https://ir.lib.uwo.ca/etd/655

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

7. Al Farhan, Mohammed. Unstructured Computations on Emerging Architectures.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/644902

► This dissertation describes detailed performance engineering and optimization of an unstructured computational aerodynamics software system with irregular memory accesses on various multi- and many-core emerging… (more)

▼ This dissertation describes detailed performance engineering and optimization of an unstructured computational aerodynamics software system with irregular memory accesses on various multi- and many-core emerging high performance computing scalable architectures, which are expected to be the building blocks of energy-austere exascale systems, and on which algorithmic- and architecture-oriented optimizations are essential for achieving worthy performance. We investigate several state-of-the-practice shared-memory optimization techniques applied to key kernels for the important problem class of unstructured meshes. We illustrate for a broad spectrum of emerging microprocessor architectures as representatives of the compute units in contemporary leading supercomputers, identifying and addressing performance challenges without compromising the floating-point numerics of the original code. While the linear algebraic kernels are bottlenecked by memory bandwidth for even modest numbers of hardware cores sharing a common address space, the edge-based loop kernels, which arise in the control volume discretization of the conservation law residuals and in the formation of the preconditioner for the Jacobian by finite-differencing the conservation law residuals, are compute-intensive and effectively exploit contemporary multi- and many-core processing hardware. We therefore employ low- and high-level algorithmic- and architecture-specific code optimizations and tuning in light of thread- and data-level parallelism, with a focus on strong thread scaling at the node-level. Our approaches are based upon novel multi-level hierarchical workload distribution mechanisms of data across different compute units (from the address space down to the registers) within every hardware core. We analyze the demonstrated aerodynamics application on specific computing architectures to develop certain performance metrics and models to bespeak the upper and lower bounds of the performance. We present significant full application speedup relative to the baseline code, on a succession of many-core processor architectures, i.e., Intel Xeon Phi Knights Corner (5.0x) and Knights Landing (2.9x). In addition, the performance of Knights Landing outperforms, at significantly lower power consumption, Intel Xeon Skylake with nearly twofold speedup. These optimizations are expected to be of value for many other unstructured mesh partial differential equation-based scientific applications as multi- and many- core architecture evolves. Advisors/Committee Members: Keyes, David E. (advisor), Moshkov, Mikhail (committee member), Hadwiger, Markus (committee member), Bagci, Hakan (committee member), Chow, Edmond (committee member).

Subjects/Keywords: Performance Optimizations; Thread-level parallelism; Data-level parallelism; Unstructured Grids; Computational Aerodynamics; Intel Xeon Phi

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al Farhan, M. (2019). Unstructured Computations on Emerging Architectures. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/644902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al Farhan, Mohammed. “Unstructured Computations on Emerging Architectures.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed March 02, 2021. http://hdl.handle.net/10754/644902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al Farhan, Mohammed. “Unstructured Computations on Emerging Architectures.” 2019. Web. 02 Mar 2021.

Vancouver:

Al Farhan M. Unstructured Computations on Emerging Architectures. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10754/644902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al Farhan M. Unstructured Computations on Emerging Architectures. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/644902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

8. Blades, Eric Lindsay. A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations.

Degree: PhD, Mechanical Engineering, 2004, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10142004-165050/ ;

► The primary objective of this study is to develop a sliding interface method for simulations involving relative rotational grid motion suitable for unstructured grid topologies.… (more)

▼ The primary objective of this study is to develop a sliding interface method for simulations involving relative rotational grid motion suitable for unstructured grid topologies. The present method alleviates computationally expensive grid deformation, remeshing, and hole cutting procedures. Rotational motion is accomplished by rigidly rotating a subdomain representing the moving component. At the subdomain interface boundary, the faces along the interfaces are extruded into the adjacent subdomain to create new volume elements and provide a one-cell overlap. These new volume elements close the control volumes for the nodes on the interface surface and allow a flux to be computed across the subdomain interface. An interface flux is computed independently for each subdomain. The values of the solution variables and other quantities for the nodes created by the extrusion process are found by interpolation. The extrusion is done so that the interpolation will maintain information as localized as possible. A parallel implementation of the neighbor search is used to find the extruded points in the adjacent subdomain. The method has been implemented in a parallel, node-centered finite volume, high-resolution viscous flow solver. The method does not impose any restrictions on the subdomain interface aside from the axisymmetric limitation required for rotational motion. In addition, the grid on the subdomain interface is arbitrary. The boundary surfaces between the two subdomains can have independent grids from one another. They do not have to connect in a one-to-one manner and there are no symmetry or pattern restrictions placed on the surface grid. A variety of numerical simulations were performed on several small-scale model problems to examine conservation of the interface flux. Overall flux conservation errors were found to be comparable to that for fully connected and fully conservative simulations. In addition, excellent agreement was obtained with both theoretical and experimental results. Three large-scale applications were also used to validate the method and highlight some of the advantages of the sliding interface method compared to the current state-of- the-art for unstructured grid applications. This sliding interface method requires no geometric modifications and has significantly shorter run times Furthermore, there were no apparent adverse effects on the numerical solutions by not strictly enforcing flux conservation at the subdomain boundary. Advisors/Committee Members: David L Marcum (chair), James C. Newman, III (committee member), D. Keith Walters (committee member), W. Roger Briley (committee member), David L. Whitfield (committee member).

Subjects/Keywords: sliding interface; moving mesh; unstructured grids; flux conservation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Blades, E. L. (2004). A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10142004-165050/ ;

Chicago Manual of Style (16^th Edition):

Blades, Eric Lindsay. “A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations.” 2004. Doctoral Dissertation, Mississippi State University. Accessed March 02, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10142004-165050/ ;.

MLA Handbook (7^th Edition):

Blades, Eric Lindsay. “A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations.” 2004. Web. 02 Mar 2021.

Vancouver:

Blades EL. A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations. [Internet] [Doctoral dissertation]. Mississippi State University; 2004. [cited 2021 Mar 02]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10142004-165050/ ;.

Council of Science Editors:

Blades EL. A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations. [Doctoral Dissertation]. Mississippi State University; 2004. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10142004-165050/ ;

9. Lopes, Pedro Pais. Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas.

Degree: Mestrado, Ciência da Computação, 2010, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/45/45134/tde-10092010-114051/ ;

►

A computacao paralela, empregada no meio cientifico para resolucao de problemas que de- mandam grande poder computacional, teve nos ultimos anos o surgimento de um… (more)

▼

A computacao paralela, empregada no meio cientifico para resolucao de problemas que de- mandam grande poder computacional, teve nos ultimos anos o surgimento de um novo tipo de comunicacao entre instancias do paralelismo. Trata-se da Comunicacao Unilateral (CUL), onde somente uma instancia realiza a operacao de transferencia de informacoes, e esta ocorre em segundo plano, ao contrario da Comunicacao Bilateral (CBL), onde uma instancia envia a informacao e a outra recebe. Neste contexto se buscou analisar os beneficios que a CUL agrega ao paralelismo de um programa que se utiliza de uma grade nao estruturada em me- moria. Duas formas de apoio ao paralelismo foram utilizadas: uma biblioteca, a \"Message Passing Interface(̈MPI) (especificamente a sua parte que descreve a CUL), e uma extensao a linguagem Fortran, o Coarray Fortran (CAF). A semantica do MPI CUL e mais complexa que a do CAF, mas a do CAF e mais restritiva. Para analisar a semantica e desempenho da CUL foi realizada uma ambientacao utilizando MPI CUL e CAF no paralelismo de um programa simples, denominado jogo da Vida (Game of Life), com grade estruturada e com otimo desempenho paralelo atraves do MPI CBL. Na programacao o MPI CUL se mostrou verborragico (aumento do numero de linhas de codigo) e complexo, principalmente quando se utiliza um controle refinado de sincronismo entre as imagens. Ja o CAF reduziu o nu- mero de linhas de codigo (entre 20% e 40%), e o sincronismo e muito mais simples. Os resultados mostraram uma piora no desempenho no caso do MPI CUL, mas para o CAF o desempenho absoluto foi melhor que a implementacao original ate o numero de nucleos de processamento que compartilham a mesma memoria. Para grades nao estruturadas se utilizou o Ocean Land Atmospheric Model (OLAM), um modelo de simulacao do sistema terrestre com grade baseada em prismas triangulares, paralelizado atraves de MPI CBL. A implementacao da comunicacao por MPI CUL na estrutura do paralelismo existente mos- trou que esta semantica possui alguns pontos que podem prejudicar a programacao, como o tratamento da exposicao de memoria (cada instancia tem uma memoria exposta de tamanho diferente) e como e realizado o sincronismo entre as instancias. Em termos de desempenho as curvas de speed-ups mostraram que o MPI CUL prejudicou o OLAM independentemente da implementacao das bibliotecas ou do equipamento utilizado, com reducao de pelo menos 20% no speed-up para sete ou mais processadores. Assim como no jogo da Vida o MPI com comunicacao unilateral penalizou o desempenho.

Parallel computing is used to solve many scientific problems that demand intensive compu- ting power. Recently a new paradigm of communication between instances of the parallelism has appeared, called the one-sided communication (OSC), where only one instance performs the operation of information transfer, occurring in the background, as opposed to the two- sided communication (TSC), where one instance sends the information and the other receives it. In this context we analyze the benefits that OSC aggregates…

Advisors/Committee Members: Song, Siang Wun.

Subjects/Keywords: CAF; CAF; Grades não estruturadas; MPI; MPI; OLAM; OLAM; Paralelismo; Parallelism; Sincronismo; Speed-up; Speed-up; Syncronism; Unstructured grids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lopes, P. P. (2010). Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/45/45134/tde-10092010-114051/ ;

Chicago Manual of Style (16^th Edition):

Lopes, Pedro Pais. “Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas.” 2010. Masters Thesis, University of São Paulo. Accessed March 02, 2021. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-10092010-114051/ ;.

MLA Handbook (7^th Edition):

Lopes, Pedro Pais. “Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas.” 2010. Web. 02 Mar 2021.

Vancouver:

Lopes PP. Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas. [Internet] [Masters thesis]. University of São Paulo; 2010. [cited 2021 Mar 02]. Available from: http://www.teses.usp.br/teses/disponiveis/45/45134/tde-10092010-114051/ ;.

Council of Science Editors:

Lopes PP. Análise de benefícios do paralelismo por comunicação unilateral em aplicações com grades não estruturadas. [Masters Thesis]. University of São Paulo; 2010. Available from: http://www.teses.usp.br/teses/disponiveis/45/45134/tde-10092010-114051/ ;

10. Sahut, Guillaume. Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids.

Degree: Docteur es, Mécanique des fluides Energétique, Procédés, 2019, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2019GREAI083

►

Cette thèse a pour objectif la simulation numérique du phénomène d'ébullition sur maillages non structurés. L'ébullition est le changement de phase des particules fluides de… (more)

▼

Cette thèse a pour objectif la simulation numérique du phénomène d'ébullition sur maillages non structurés. L'ébullition est le changement de phase des particules fluides de la phase liquide vers la phase vapeur sous l'action des flux thermiques à l'interface séparant les deux phases. Il s'agit donc d'un phénomène rencontré au sein d'écoulements diphasiques et piloté par le taux de transfert de masse à l'interface. Ce taux de transfert de masse est calculé à partir des flux thermiques de part et d'autre de l'interface. Cela implique donc la nécessité d'adopter une méthode de suivi d'interface très précise pour localiser l'interface à tout instant de la simulation. Les équations de Navier-Stokes sont alors couplées à l'équation de la chaleur par l'intermédiaire du taux de transfert de masse à l'interface. De telles simulations ont été menées par Tanguy et al. (J. Comput. Phys., 2014) sur des maillages cartésiens axisymétriques en deux dimensions. Dans cette thèse, nous étendons cette méthodologie à des maillages non structurés en trois dimensions (maillages composés de tétraèdres non réguliers utiles pour décrire des géométries complexes). Pour ce faire, nous avons développé un solveur spécifique dans le code YALES2 (code diphasique basé sur la méthode des volumes finis pour des maillages 3D non structurés). Le suivi de l'interface est assuré par la méthode Level Set. Le changement de phase engendre des discontinuités de vitesse et de pression à l'interface qui dépendent notamment du taux de transfert de masse. Ces discontinuités sont prises en compte par la méthode Ghost Fluid à l'aide de deux champs de vitesse et deux champs de température. Cette méthodologie étant déjà bien établie pour des maillages structurés cartésiens, l'apport de cette thèse réside dans la possibilité de simuler le changement de phase par ébullition sur des maillages non structurés en trois dimensions. Les spécificités des maillages non structurés ont nécessité de nombreux développements pour la réinitialisation de la fonction Level Set après advection, ainsi que l'utilisation d'opérateurs d'ordres élevés pour le calcul du taux de transfert de masse à l'interface. L'ensemble des développements proposés est finalement validé sur maillages non structurés à l'aide du cas-test analytique d'une bulle 3D en expansion dans un liquide surchauffé au repos.

The objective of this thesis is the numerical simulation of the boiling henomenon on unstructured grids. Boiling is the phase change of fluid particles from the liquid phase to the vapor phase under the action of thermal fluxes at the interface separating the two phases. Boiling is thus encountered in two-phase flows and driven by the mass transfer rate at the interface. This mass transfer rate is computed from the thermal fluxes on both sides of the interface. Consequently, a highly accurate numerical method is needed to locate the interface throughout the simulation. The Navier-Stokes equations are then coupled to the heat equation by means of the mass transfer rate at the interface. Such…

Advisors/Committee Members: Marty, Philippe (thesis director), Balarac, Guillaume (thesis director), Ghigliotti, Giovanni (thesis director).

Subjects/Keywords: Écoulements diphasiques; Ébullition; Calcul haute performance; Maillages non structurés; Two-Phase flows; Boiling; High-Performance computing; Unstructured grids; 620

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sahut, G. (2019). Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2019GREAI083

Chicago Manual of Style (16^th Edition):

Sahut, Guillaume. “Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids.” 2019. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed March 02, 2021. http://www.theses.fr/2019GREAI083.

MLA Handbook (7^th Edition):

Sahut, Guillaume. “Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids.” 2019. Web. 02 Mar 2021.

Vancouver:

Sahut G. Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2019. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2019GREAI083.

Council of Science Editors:

Sahut G. Simulation numérique de l'ébullition sur maillages non structurés : Numerical simulation of boiling on unstructured grids. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2019. Available from: http://www.theses.fr/2019GREAI083

Delft University of Technology

11. Naifar, F. A finite volume solver for the simulation of transport processes.

Degree: 2006, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1

► The simulation of the tracer transport process is an increasingly important tool to predict the distribution of pollution released in coastal waters. The equation that… (more)

▼ The simulation of the tracer transport process is an increasingly important tool to predict the distribution of pollution released in coastal waters. The equation that governs the tracer transport is the advection-diffusion equation. Thanks to the tremendous developments in computer resources and in computing techniques, it has become possible to solve this equation for multi-dimensional problems and in complex domains. This thesis, devoted to this subject of tracer transport, consists of two main parts. The first deals with the existing 2-D transport solver and emphasizes notably on the improvements brought to this solver. Based on the finite volume method, the solver uses input data obtained from a separate flow solver. It was shown that a preprocessing step of the flow parameters according to newly developed techniques is required in order to ensure the positivity of the computed concentrations and the mass conservation of the overall solution. In order to be able to adopt a different time step in the transport solver than used for the flow computation, the usage of time integrated flow data has proven to be an efficient technique. The improvements brought to the 2-D solver were tested through the numerical application to a real-life case. The Dutch coastline case was chosen because of its importance from the environmental point of view. In the second part of the thesis, a 3-D version of the transport solver is developed. In the vertical direction, the physical domain is subdivided in a fixed number of layers, while in the horizontal direction, the domain is represented using an unstructured grid. The numerical estimation of the different fluxes of the adopted finite volume method are described in detail. The 3-D version requires also the preprocessing of the input flow data prior to their use in order to avoid the occurrence of unrealistic sources and sinks. The testing of the newly developed 3-D solver is achieved using two numerical applications. The first is a hypothetical test case consisting of simulating a tracer release in a river stretch and the second is a real-life application concerning the Dutch coastline. Different vertical profiles for the vertical diffusion coefficient were tested since this term plays an important role in the vertical mixing. Advisors/Committee Members: Heemink, A.W., Stelling, G.S., Wilders, P..

Subjects/Keywords: finite volume; transport; unstructured grids; positivity; mass conservation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Naifar, F. (2006). A finite volume solver for the simulation of transport processes. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1

Chicago Manual of Style (16^th Edition):

Naifar, F. “A finite volume solver for the simulation of transport processes.” 2006. Doctoral Dissertation, Delft University of Technology. Accessed March 02, 2021. http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1.

MLA Handbook (7^th Edition):

Naifar, F. “A finite volume solver for the simulation of transport processes.” 2006. Web. 02 Mar 2021.

Vancouver:

Naifar F. A finite volume solver for the simulation of transport processes. [Internet] [Doctoral dissertation]. Delft University of Technology; 2006. [cited 2021 Mar 02]. Available from: http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1.

Council of Science Editors:

Naifar F. A finite volume solver for the simulation of transport processes. [Doctoral Dissertation]. Delft University of Technology; 2006. Available from: http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; urn:NBN:nl:ui:24-uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1 ; http://resolver.tudelft.nl/uuid:07102bcb-dc4e-4bd4-9691-9de832ffa2e1

12. Djeddi, Seyedreza. Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks.

Degree: 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/5276

► With the growing environmental consciousness, the global perspective in energy production is shifting towards renewable resources. As recently reported by the Office of Energy Efficiency… (more)

▼ With the growing environmental consciousness, the global perspective in energy production is shifting towards renewable resources. As recently reported by the Office of Energy Efficiency & Renewable Energy at the U.S. Department of Energy, wind-generated electricity is the least expensive form of renewable power and is becoming one of the cheapest forms of electricity from any source. The aeromechanical design of wind turbines is a complex and multidisciplinary task which necessitates a high-fidelity flow solver as well as efficient design optimization tools. With the advances in computer technologies, Computational Fluid Dynamics (CFD) has established its role as a high-fidelity tool for aerodynamic design.In this dissertation, a grid-transparent unstructured two- and three-dimensional compressible Reynolds-Averaged Navier-Stokes (RANS) solver, named UNPAC, is developed. This solver is enhanced with an algebraic transition model that has proven to offer accurate flow separation and reattachment predictions for the transitional flows. For the unsteady time-periodic flows, a harmonic balance (HB) method is incorporated that couples the sub-time level solutions over a single period via a pseudo-spectral operator. Convergence to the steady-state solution is accelerated using a novel reduced-order-model (ROM) approach that can offer significant reductions in the number of iterations as well as CPU times for the explicit solver. The unstructured grid is adapted in both steady and HB cases using an r-adaptive mesh redistribution (AMR) technique that can efficiently cluster nodes around regions of large flow gradients.Additionally, a novel toolbox for sensitivity analysis based on the discrete adjoint method is developed in this work. The Fast automatic Differentiation using Operator-overloading Technique (FDOT) toolbox uses an iterative process to evaluate the sensitivities of the cost function with respect to the entire design space and requires only minimal modifications to the available solver. The FDOT toolbox is coupled with the UNPAC solver to offer fast and accurate gradient information. Ultimately, a wrapper program for the design optimization framework, UNPAC-DOF, has been developed. The nominal and adjoint flow solutions are directly incorporated into a gradient-based design optimization algorithm with the goal of improving designs in terms of minimized drag or maximized efficiency.

Subjects/Keywords: Computational Fluid Dynamics (CFD); Unstructured/Mixed Grids; Design Optimization; Adjoint Sensitivity Analysis; Adaptive Grid Redistribution; Convergence Acceleration

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Djeddi, S. (2018). Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/5276

Chicago Manual of Style (16^th Edition):

Djeddi, Seyedreza. “Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks.” 2018. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed March 02, 2021. https://trace.tennessee.edu/utk_graddiss/5276.

MLA Handbook (7^th Edition):

Djeddi, Seyedreza. “Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks.” 2018. Web. 02 Mar 2021.

Vancouver:

Djeddi S. Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2018. [cited 2021 Mar 02]. Available from: https://trace.tennessee.edu/utk_graddiss/5276.

Council of Science Editors:

Djeddi S. Towards Adaptive and Grid-Transparent Adjoint-Based Design Optimization Frameworks. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_graddiss/5276

Virginia Tech

13. Kashefi, Ali. A Finite-Element Coarse-GridProjection Method for Incompressible Flows.

Degree: MS, Engineering Science and Mechanics, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/79948

► Coarse grid projection (CGP) methodology is a novel multigrid method for systems involving decoupled nonlinear evolution equations and linear elliptic Poisson equations. The nonlinear equations… (more)

Subjects/Keywords: Semi-implicit time integration; Finite elements; Coarse-grid projection; Unstructured grids; Geometric multigrid methods; Pressure-correction schemes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kashefi, A. (2017). A Finite-Element Coarse-GridProjection Method for Incompressible Flows. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/79948

Chicago Manual of Style (16^th Edition):

Kashefi, Ali. “A Finite-Element Coarse-GridProjection Method for Incompressible Flows.” 2017. Masters Thesis, Virginia Tech. Accessed March 02, 2021. http://hdl.handle.net/10919/79948.

MLA Handbook (7^th Edition):

Kashefi, Ali. “A Finite-Element Coarse-GridProjection Method for Incompressible Flows.” 2017. Web. 02 Mar 2021.

Vancouver:

Kashefi A. A Finite-Element Coarse-GridProjection Method for Incompressible Flows. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10919/79948.

Council of Science Editors:

Kashefi A. A Finite-Element Coarse-GridProjection Method for Incompressible Flows. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/79948

Virginia Tech

14. Bruner, Christopher William Stuteville. Parallelization of the Euler Equations on Unstructured Grids.

Degree: PhD, Aerospace and Ocean Engineering, 1996, Virginia Tech

URL: http://hdl.handle.net/10919/30397

► Several different time-integration algorithms for the Euler equations are investigated on two distributed-memory parallel computers using an explicit message-passing paradigm: these are classic Euler Explicit,… (more)

Subjects/Keywords: unstructured grids; parallel algorithms; computational fluid dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bruner, C. W. S. (1996). Parallelization of the Euler Equations on Unstructured Grids. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/30397

Chicago Manual of Style (16^th Edition):

Bruner, Christopher William Stuteville. “Parallelization of the Euler Equations on Unstructured Grids.” 1996. Doctoral Dissertation, Virginia Tech. Accessed March 02, 2021. http://hdl.handle.net/10919/30397.

MLA Handbook (7^th Edition):

Bruner, Christopher William Stuteville. “Parallelization of the Euler Equations on Unstructured Grids.” 1996. Web. 02 Mar 2021.

Vancouver:

Bruner CWS. Parallelization of the Euler Equations on Unstructured Grids. [Internet] [Doctoral dissertation]. Virginia Tech; 1996. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10919/30397.

Council of Science Editors:

Bruner CWS. Parallelization of the Euler Equations on Unstructured Grids. [Doctoral Dissertation]. Virginia Tech; 1996. Available from: http://hdl.handle.net/10919/30397

Virginia Tech

15. Newman, James Charles III. Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations.

Degree: PhD, Mechanical Engineering, 1997, Virginia Tech

URL: http://hdl.handle.net/10919/30711

► The first two steps in the development of an integrated multidisciplinary design optimization procedure capable of analyzing the nonlinear fluid flow about geometrically complex aeroelastic… (more)

▼ The first two steps in the development of an integrated multidisciplinary design optimization procedure capable of analyzing the nonlinear fluid flow about geometrically complex aeroelastic configurations have been accomplished in the present work. For the first step, a three-dimenstional unstructured grid approach to earodynamic shape sensitivity analysis and design optimization has been developed. The advantage of unstructured grids, when compared with a structured-grid approach, is their inherent ability to discretize irregularly shaped domains with greater efficiency and less effort. Hence, this approach is ideally suited fro geometrically complex configurations of practical interest. In this work the time-dependent, nonlinear Euler equations are solved using an upwind, cell-centered, finite-volume scheme. The descrete, linearized systems which result from this scheme are solved iteratively by a preconditioned conjugate-gradient-like algorithm known as GMRES for the two-dimensional cases and a Gauss-Seidel algorithm for the three-dimensional; at steady-state, similar procedures are used to solve the accompanying linear aerodynamic sensitivitiy equations in incremental iterative form. As shown, this particular form of the sensitivity equation makes large-scale gradient-based aerodynamic optimization possible bytaking advantage of memory efficient methods to construct exact Jacobian matrix-vector products. Various surface parameterization techniques have been employed in the current study to control the shape of the design surface. Once this surface has been deformed, the interior volume of the unstructured grid is adapted by considering the mesh as a system of interconnected tension springs. Grid sensitivities are obtained by differentiating the surface parameterization and the grid adaptiation algorithms with ADIFOR, an advanced automatic-differentiation software tool. To demonstrate the ability of this procedure to analyze and design complex configurations of practical interest, the sensitivity analysis and shape optimization has been performaed for several two- and three-dimensional cases. In two-dimensions, an initially symmetric NACA-0012 airfoil and a high-lift multielement airfoil were examined. For the three-dimensional configurations, an initially rectangular wing with uniform NACA-0012 cross-scetions was optimized; in additions, a complete Boeing 747-200 aircraft was studied. Furthermore, the current study also examines the effect of inconsistency in the order of spatial accuracy between the nonlinear fluid and linear shape sensitivity equations. The second step was to develop a computationally efficient, high-fidelity, integrated static aeroelastic analysis procedure. To accomplish this, a structural analysis code was coupled with the aforementioned unstructured grid aerodynamic analysis solver. The use of an unstructured grid scheme for the aerodynamic analysis enhances the interactions compatibility with the wing structure. The structural analysis utilizes finite elements to… Advisors/Committee Members: Barnwell, Richard W. (committeechair), West, Robert L. Jr. (committee member), Ng, Wing Fai (committee member), Scott, Elaine P. (committee member), Taylor, A. C. (committee member).

Subjects/Keywords: Static Aeroelastic Analysis; Unstructured Grids; Aerodynamic Shape Optimization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Newman, J. C. I. (1997). Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/30711

Chicago Manual of Style (16^th Edition):

Newman, James Charles III. “Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations.” 1997. Doctoral Dissertation, Virginia Tech. Accessed March 02, 2021. http://hdl.handle.net/10919/30711.

MLA Handbook (7^th Edition):

Newman, James Charles III. “Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations.” 1997. Web. 02 Mar 2021.

Vancouver:

Newman JCI. Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations. [Internet] [Doctoral dissertation]. Virginia Tech; 1997. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10919/30711.

Council of Science Editors:

Newman JCI. Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations. [Doctoral Dissertation]. Virginia Tech; 1997. Available from: http://hdl.handle.net/10919/30711

16. Bruno Ramon Batista Fernandes. Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance.

Degree: Master, 2014, Universidade Federal do Ceará

URL: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12055 ;

►

In reservoir simulation, the compositional model is one of the most used models for enhanced oil recovery. However, the physical model involves a large number… (more)

▼

In reservoir simulation, the compositional model is one of the most used models for enhanced oil recovery. However, the physical model involves a large number of equations with a very complex interplay between equations. The model is basically composed of balance equations and equilibrium constraints. The way these equations are solved, the degree of implicitness, the selection of the primary equations, primary and secondary variables have a great impact on the computation time. In order to verify these effects, this work proposes the implementation and comparison of some implicit and semi-implicit methods. The following formulations are tested: an IMPEC (implicit pressure, explicit composition), an IMPSAT (implicit pressure and saturations), and two fully implicit formulations, in which one these formulations is being proposed in this work. However, the literature reports some intrinsic inconsistencies of the IMPSAT formulation mentioned. In order to verify it, an iterative IMPSAT is implemented to check the quality of the IMPSAT method previously mentioned. The finite volume method is used to discretize the formulations using Cartesian grids and unstructured grids in conjunction with the EbFVM (Element based finite volume method) for 2D and 3D reservoirs. The implementations have been performed in the UTCOMP simulator from the University of Texas at Austin. The results of several case studies are compared in terms of volumetric oil and gas rates and the total CPU time. It was verified that the FI approaches increase their performance, when compared to the other approaches, as the grid is refined. A good performance was observed for the IMPSAT approach when compared to the IMPEC formulation. However, as more complex stencils are used, the IMPSAT performance reduces.

Em simulaÃÃo de reservatÃrios, o modelo composicional Ã um dos mais usados para a recuperaÃÃo avanÃada de petrÃleo. Entretanto, o modelo fÃsico envolve um grande nÃmero de equaÃÃes com uma complexa interelaÃÃo entre elas. O modelo Ã basicamente composto por equaÃÃes de balanÃo e restriÃÃes de equilÃbrio. A forma como essas equaÃÃes sÃo resolvidas como, o grau de implicitude, a seleÃÃo das equaÃÃes primÃrias, variÃveis primÃrias e secundÃrias tem um grande impacto no tempo de computaÃÃo. Com o intuito de verificar esse efeito, esse trabalho propÃe a implementaÃÃo e comparaÃÃo de alguns mÃtodos implÃcitos e semi-implÃcitos. As seguintes formulaÃÃes sÃo testadas: uma IMPEC (implicit pressure, explicit composition), uma IMPSAT (implicit pressure and saturations), e duas formulaÃÃes totalmente implicitas, das quais uma destas estÃ sendo proposta neste trabalho. Entretanto, a literatura relata algumas inconsistÃncias intrÃnsecas da formulaÃÃo IMPSAT mencionada. Para verificar isso, um IMPSAT iterativo foi implementado para verificar a qualidade nos resultados do mÃtodo IMPSAT prÃviamente mencionado. O mÃtodo de volumes finitos Ã usado para discretizar as formulaÃÃes usando malhas Cartesianas e nÃo-estruturadas em conjunto com o EbFVM (Element based finite…

Advisors/Committee Members: SebastiÃo MardÃnio Pereira de Lucena, Clovis Raimundo Maliska, Francisco Marcondes.

Subjects/Keywords: PRINCIPIOS VARIACIONAIS E METODOS NUMERICOS; Engenharia quÃmica; SimulaÃÃo; Volumes finitos; MecÃnica dos fluidos; Escoamento em meios porosos; Malhas nÃo-estruturadas; Compositional Simulation; EbFVM; IMPEC; IMPSAT; Fully Implicit; Unstructured grids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fernandes, B. R. B. (2014). Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance. (Masters Thesis). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12055 ;

Chicago Manual of Style (16^th Edition):

Fernandes, Bruno Ramon Batista. “Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance.” 2014. Masters Thesis, Universidade Federal do Ceará. Accessed March 02, 2021. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12055 ;.

MLA Handbook (7^th Edition):

Fernandes, Bruno Ramon Batista. “Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance.” 2014. Web. 02 Mar 2021.

Vancouver:

Fernandes BRB. Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance. [Internet] [Masters thesis]. Universidade Federal do Ceará 2014. [cited 2021 Mar 02]. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12055 ;.

Council of Science Editors:

Fernandes BRB. Implicit and semi-implicit techniques for the compositional petroleum reservoir simulation based on volume balance. [Masters Thesis]. Universidade Federal do Ceará 2014. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12055 ;

Mississippi State University

17. Balsubramanian, Ravishankar. ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS.

Degree: MS, Computational Engineering, 2002, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10032002-113749/ ;

► Within the design process, computational fluid dynamics is typically used to compute specific quantities that assess the performance of the apparatus under investigation. These quantities… (more)

▼ Within the design process, computational fluid dynamics is typically used to compute specific quantities that assess the performance of the apparatus under investigation. These quantities are usually integral output functions such as force and moment coefficients. However, to accurately model the configuration, the geometric features and the resulting physical phenomena must be adequately resolved. Due to limited computational resources a compromise must be made between the fidelity of the solution obtained and the available resources. This creates a degree of uncertainty about the error in the computed output functions. To this end, the current study attempts to address this problem for two-dimensional inviscid, incompressible flows on unstructured grids. The objective is to develop an error estimation and grid adaptive strategy for improving the accuracy of output functions from computational fluid dynamic codes. The present study employs a discrete adjoint formulation to arrive at the error estimates in which the global error in the output function is related to the local residual errors in the flow solution via adjoint variables as weighting functions. This procedure requires prolongation of the flow solution and adjoint solution from coarse to finer grids and, thus, different prolongation operators are studied to evaluate their influence on the accuracy of the error correction terms. Using this error correction procedure, two different adaptive strategies may be employed to enhance the accuracy of the chosen output to a prescribed tolerance. While both strategies strive to improve the accuracy of the computed output, the means by which the adaptation parameters are formed differ. The first strategy improves the computable error estimates by forming adaptation parameters based on the level of error in the computable error estimates. A grid adaptive scheme is then implemented that takes into account the error in both the primal and dual solutions. The second strategy uses the computable error estimates as indicators in an iterative grid adaptive scheme to generate grids that produce accurate estimates of the chosen output. Several test cases are provided to demonstrate the effectiveness and robustness of the error correction procedure and the grid adaptive methods. Advisors/Committee Members: Dr. Clarence O. E. Burg (committee member), Dr. James C. Newman, III (chair), Dr. Kidambi Sreenivas (committee member).

Subjects/Keywords: unstructured grids; output-based adaptation; sensitivity analysis; computational fluid dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Balsubramanian, R. (2002). ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10032002-113749/ ;

Chicago Manual of Style (16^th Edition):

Balsubramanian, Ravishankar. “ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS.” 2002. Masters Thesis, Mississippi State University. Accessed March 02, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10032002-113749/ ;.

MLA Handbook (7^th Edition):

Balsubramanian, Ravishankar. “ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS.” 2002. Web. 02 Mar 2021.

Vancouver:

Balsubramanian R. ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS. [Internet] [Masters thesis]. Mississippi State University; 2002. [cited 2021 Mar 02]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10032002-113749/ ;.

Council of Science Editors:

Balsubramanian R. ERROR ESTIMATION AND GRID ADAPTATION FOR FUNCTIONAL OUTPUTS USING DISCRETE-ADJOINT SENSITIVITY ANALYSIS. [Masters Thesis]. Mississippi State University; 2002. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10032002-113749/ ;

Pontifical Catholic University of Rio de Janeiro

18. [No author]. [pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS.

Degree: 2020, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=47746

►

[pt] A simulação numérica é uma ferramenta essencial para a engenharia de reservatórios moderna, em particular no desenvolvimento de campos de óleo marítimos. A maioria… (more)

▼

[pt] A simulação numérica é uma ferramenta essencial para a engenharia de reservatórios moderna, em particular no desenvolvimento de campos de óleo marítimos. A maioria das simulações de reservatórios utilizam malhas estruturadas em três dimensões, com tamanho variando de alguns milhares a dezenas de milhões de células. Algumas simulações apresentam um alto custo computacional que pode dificultar os estudos de desenvolvimento de um campo, mesmo com a alta capacidade computacional disponível hoje. Malhas de simulação não-estruturadas são uma alternativa para reduzir o tamanho dos modelos de reservatórios (e, consequentemente, o tempo de execução das simulações), sem sacrificar a qualidade dos resultados. Este trabalho utiliza malhas de Voronoi, também conhecidas como malhas de bissetores perpendiculares, uma vez que suas propriedades permitem simplificar as equações discretizadas do escoamento em comparação com outros tipos de malhas não-estruturadas. Dois passos são críticos para a criação de um modelo não-estruturado de reservatórios a partir de um modelo geológico refinado: geração da malha e transferência de escala das propriedades. A maioria dos métodos propostos para ambas as tarefas utilizam informações de simulações na malha refinada. Embora essa abordagem apresente bons resultados, pode ser muito custosa e precisa ser refeita caso haja alterações significativas nas condições de escoamento. Este trabalho discute técnicas para geração de malha e transferência de escala que não dependam de simulações na escala fina. As técnicas utilizam apenas a distribuição de propriedades de reservatórios e o posicionamento de poços, falhas e outras feições discretas. A abordagem adotada para geração da malha parte de uma disposição regular de pontos que são redistribuídos de acordo com um mapa de espaçamento previamente definido. Dois algoritmos iterativos para redistribuição desses pontos baseados em modelos físicos são propostos. Diversos critérios de espaçamento também são investigados. Dois algoritmos de transferência de escala em malhas não-estruturadas são propostos. Estes métodos se baseiam nas técnicas de Cardwell and Parsons e de renormalização para transferência de escala em malhas estruturadas. Por fim, exemplos representativos são utilizados para demonstrar as potencialidades e eficácia das estratégias propostas.

[en] Numerical simulation represents an essential tool for modern reservoir engineering, especially for the development of offshore oil fields. Most reservoir simulations are performed on three-dimensional structured grids, with a size ranging from a few thousands to tens of millions of cells. Some simulations can have a high computational cost that hinders the field development studies, even using the processing power available nowadays. Unstructured meshes are an effective alternative to reduce the size of reservoir models (and, consequently, the overall simulation time) without sacrificing the quality of the results. In this work, we adopt Voronoi meshes, also known as perpendicular bisector grids,…

Subjects/Keywords: [pt] MALHAS NAO ESTRUTURADAS; [en] UNSTRUCTURED MESHES; [pt] SIMULACAO DE RESERVATORIOS; [en] RESERVOIR SIMULATION; [pt] MALHAS DE VORONOI; [en] VORONOI GRIDS; [pt] TRANSFERENCIA DE ESCALA; [en] UPSCALING

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

author], [. (2020). [pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=47746

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “[pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS.” 2020. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed March 02, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=47746.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “[pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS.” 2020. Web. 02 Mar 2021.

Vancouver:

author] [. [pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2020. [cited 2021 Mar 02]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=47746.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. [pt] ESTRATÉGIAS DE GERAÇÃO DE MALHAS NÃO-ESTRUTURADAS E TRANSFERÊNCIA DE ESCALA PARA SIMULAÇÃO DE ESCOAMENTO EM RESERVATÓRIOS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2020. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=47746

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Soismier, Matthieu. Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects.

Degree: Docteur es, Mécanique des fluides Energétique, Procédés, 2016, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2016GREAI113

►

Les motoristes aéronautiques souhaitent disposer de la représentation la plus fidèle possible du fonctionnement des propulseurs, dans une perspective d'amélioration continue de leurs performances. Les… (more)

▼

Les motoristes aéronautiques souhaitent disposer de la représentation la plus fidèle possible du fonctionnement des propulseurs, dans une perspective d'amélioration continue de leurs performances. Les modèles numériques doivent donc intégrer au maximum les détails géométriques susceptibles d'influencer la physique de l'écoulement analysé. La prise en compte de tels effets technologiques s'avère difficile dans le contexte des solveurs structurés disponibles.Une stratégie hybride de prise en compte des effets technologiques fait coexister au sein d'un même domaine de calcul des zones structurées et non structurées. La flexibilité de génération d'un maillage non structuré permet une prise en compte aisée des détails géométriquement complexes tandis que la préservation de zones structurées dans une majeure partie du domaine de calcul permet de bénéficier de l'efficacité d'un solveur structuré. La présente thèse contribue au développement de cette stratégie hybride au sein du solveur elsA de l'ONERA en proposant des gains de précision et de robustesse par rapport à la version initialement développée pour établir la faisabilité et l'intérêt de l'approche. Après un état de l'art des techniques de discrétisation spatiale disponibles dans cette version initiale, différentes améliorations (techniques de moindres carrés, approche dite quasi-Green, méthode d'estimation des gradients aux faces) ont été analysées puis implémentées et validées sur des cas académiques. Le choix d'une stratégie hybride avec raccords coïncidents entre zones structurées et non-structurées conduit à des déformations de maillage dans la zone d'interface structuré / non-structuré qui ont exigé le développement supplémentaire de techniques d'amélioration de la robustesse (limiteurs physiques ou géométriques). Le solveur hybride rassemblant ces différentes fonctionnalités a permisde simuler avec succès des géométries d'aubes isolées dotées d'effets technologiques tels que congé de raccordement, trous de refroidissement, fentes de bord de fuite, cheminées internes d'alimentation. Enfin, une stratégie permettant l'utilisation de l'approche hybride en étage complet a été proposée et appliquée à la simulation hybride de l'interaction rotor/stator pour la configuration VKI-BRITE CT3, en stationnaire et en instationnaire, respectivement via une condition de plan de mélange et une condition de chorochronicité.

The aerospace engine manufacturers wish to rely on the most accurate description of their propulsion systems in order to continuously improve their performance levels. Therefore, numerical models must include as much as possible geometrical details likely to impact the physics of the flow under study. Taking into account such technological effects turns out to be a difficult task when working with available structured solvers. A hybrid strategy takes advantage of structured and unstructured zones within the same computational domain in order to efficiently describe technological effects. Geometrically complex local details are easily accounted for thanks…

Advisors/Committee Members: Corre, Christophe (thesis director).

Subjects/Keywords: Turbomachines; Maillages hybrides structurés/non structurés; Solveur hybride robuste; Trou de refroidissement; Interaction rotor/stator; Turbomachinery; Hybrid structured / unstructured grids; Robust hybrid solver; Cooling hole; Rotor/stator interaction; 620

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soismier, M. (2016). Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2016GREAI113

Chicago Manual of Style (16^th Edition):

Soismier, Matthieu. “Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects.” 2016. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed March 02, 2021. http://www.theses.fr/2016GREAI113.

MLA Handbook (7^th Edition):

Soismier, Matthieu. “Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects.” 2016. Web. 02 Mar 2021.

Vancouver:

Soismier M. Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2016. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2016GREAI113.

Council of Science Editors:

Soismier M. Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines : Hybrid structured / unstructured solution strategy for the simulation of turbomachinery technological effects. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2016. Available from: http://www.theses.fr/2016GREAI113

20. Pont, Grégoire. Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires.

Degree: Docteur es, Mécanique-matériaux, 2015, Paris, ENSAM

URL: http://www.theses.fr/2015ENAM0008

►

Cette thèse est principalement dédiée à la simulation des écoulements massivement décollés dans le domaine spatial. Nous avons restreint notre étude aux écoulements d'arrière-corps, pour… (more)

▼

Cette thèse est principalement dédiée à la simulation des écoulements massivement décollés dans le domaine spatial. Nous avons restreint notre étude aux écoulements d'arrière-corps, pour lesquels ces décollements sont imposés par des changements brutaux de la géométrie. Dans le domaine spatial, le caractère fortement compressible des écoulements rencontrés impose l'utilisation de schémas numériques robustes. D'un autre coté, la simulation fine de la turbulence impose des schémas d'ordre élevé et peu dissipatifs. Ces deux spécifications, apparemment contradictoires, doivent pourtant coexister au sein d'une même simulation. Les modèles de turbulence ainsi que les schémas de discrétisation sont indissociables et leur couplage doit impérativement être considéré. Les schémas numériques doivent garder leur précision formelle dans des géométries complexes et des maillages très irréguliers imposés par le contexte industriel. Cette étude analyse le schéma de discrétisation utilisé dans le code de calcul FLUSEPA développé par Airbus Defence & Space. Ce schéma est robuste et précis pour des écoulements avec chocs et il présente une faible sensibilité au maillage (l'ordre 3 étant conservé même sur des maillages fortement perturbés). Malheureusement, le schéma possède une trop faible résolvabilité liée à un niveau de dissipation trop élevé pour envisager des simulations hybrides RANS/LES. Pour pallier à cet inconvénient, nous nous sommes penchés vers une solution basée sur un recentrage conditionnel et local : dans les zones dominées par des structures tourbillonnaires, une fonction analytique assure un recentrage local lorsque la stabilité numérique le permet. Cette condition de stabilité assure le couplage entre le schéma et le modèle. De cette manière, les viscosités laminaire et tourbillonnaire sont les seules à jouer un rôle dans les régions dominées par la vorticité et servent aussi à stabiliser le schéma numérique. Cette étude présente de plus une comparaison qualitative et quantitative de plusieurs modèles hybrides RANS/LES, à égalité de maillage et de schéma utilisés Pour cela, un certain nombre d'améliorations (notamment de leur capacité à résoudre les instabilités de Kelvin-Helmohlotz sans retard), proposées dans la littérature ou bien introduites dans cette thèse, sont prises en compte. Les applications numériques étudiées concernent des géométries allant de la marche descendante au lanceur spatial complet à échelle réduite.

This thesis is mainly dedicated to the simulation of massively separated flows in the space domain. We restricted our study to afterbody flows, where the separation is imposed by abrupt geometry changes. In the space domain, highly compressible flows require the use of robust numerical schemes. On the other hand, the simulation of turbulence imposes high-order low dissipative numerical schemes. These two specifications, apparently contradictory, must coexist within the same simulation. The…

Advisors/Committee Members: Cinnella, Paola (thesis director), Robinet, Jean-Christophe (thesis director), Brenner, Pierre (thesis director).

Subjects/Keywords: Volumes finis d'ordre élevé; VC scheme; Méthodes Numériques; Flusepa; Modèles hybride RANS/LES; Turbulence; High order finite volumes; VC scheme; Irregular grids; Unstructured girds; Flusepa; Hybrid RANS/LES models

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pont, G. (2015). Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires. (Doctoral Dissertation). Paris, ENSAM. Retrieved from http://www.theses.fr/2015ENAM0008

Chicago Manual of Style (16^th Edition):

Pont, Grégoire. “Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires.” 2015. Doctoral Dissertation, Paris, ENSAM. Accessed March 02, 2021. http://www.theses.fr/2015ENAM0008.

MLA Handbook (7^th Edition):

Pont, Grégoire. “Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires.” 2015. Web. 02 Mar 2021.

Vancouver:

Pont G. Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires. [Internet] [Doctoral dissertation]. Paris, ENSAM; 2015. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2015ENAM0008.

Council of Science Editors:

Pont G. Self adaptive turbulence models for unsteady compressible flows Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires : Modèles de turbulence auto-adaptatifs pour la simulation des écoulements compressibles instationnaires. [Doctoral Dissertation]. Paris, ENSAM; 2015. Available from: http://www.theses.fr/2015ENAM0008

21. LIU YANGYANG. DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS.

Degree: 2020, National University of Singapore

URL: https://scholarbank.nus.edu.sg/handle/10635/166577

Subjects/Keywords: high-order; unstructured grids; finite volume method; compressible; incompressible; PEEB limiter

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

YANGYANG, L. (2020). DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS. (Thesis). National University of Singapore. Retrieved from https://scholarbank.nus.edu.sg/handle/10635/166577

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

YANGYANG, LIU. “DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS.” 2020. Thesis, National University of Singapore. Accessed March 02, 2021. https://scholarbank.nus.edu.sg/handle/10635/166577.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

YANGYANG, LIU. “DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS.” 2020. Web. 02 Mar 2021.

Vancouver:

YANGYANG L. DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS. [Internet] [Thesis]. National University of Singapore; 2020. [cited 2021 Mar 02]. Available from: https://scholarbank.nus.edu.sg/handle/10635/166577.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

YANGYANG L. DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS. [Thesis]. National University of Singapore; 2020. Available from: https://scholarbank.nus.edu.sg/handle/10635/166577

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Zaytsev, Victor. Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids.

Degree: Docteur es, Géostatistique, 2016, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2016PSLEM094

►

La simulation des phénomènes physiques exige souvent l’utilisation d’une discrétisation du milieu sous forme de maillage. Un exemple de ce type de situation est la… (more)

▼

La simulation des phénomènes physiques exige souvent l’utilisation d’une discrétisation du milieu sous forme de maillage. Un exemple de ce type de situation est la simulation d’écoulement de fluides et la simulation du stress géomécanique pour les gisements pétroliers. Dans ces cas, le milieu étudié n’est pas homogène et l'hypothèse sur l’homogénéité de ce milieu peut mener à des résultats incorrects. C’est pourquoi la simulation des hétérogénéités est très importante pour ce genre de problèmes.Cette thèse est consacrée à la simulation géostatistique des hétérogénéités sur les maillages non-structurés par les méthodes géostatistiques non-linéaires. Le but de cette thèse est la création d’algorithmes de simulation des hétérogénéités directement sur les maillages non-structurés, sans utiliser les maillages fins réguliers intermédiaires et de l’upscaling. On présente deux modèles théoriques pour les simulations des variables continues sur les maillages non-structurés qui sont les deux versions différentes du modèle Gaussien discret (DGM) - DGM 1 et DGM 2. Le modèle théorique utilisé dans cette thèse permet de convertir le problème de simulation sur un maillage non-structuré en un problème de simulation d’un vecteur Gaussien multivarié et l’application de fonctions de transformation adaptées pour chaque élément du vecteur. La simulation de faciès est aussi envisagée en utilisant une généralisation des modèles pluri-Gaussiens et Gaussien tronqués pour les maillages non-structurés.L’application des méthodes développées est illustrée sur un gisement pétrolier - le cas d’étude X (gisement du gaz offshore).

Simulations of physical phenomenon often require discretizing the medium with a mesh. An example of this type of simulation is the simulation of fluid flow through a porous medium and the evaluation of the geomechanical stress in the petroleum reservoir. The studied medium is often not homogeneous and applying a homogeneity hypothesis can lead to incorrect simulation results. That makes simulation of heterogeneities important for this kind of problems.This thesis is devoted to geostatistical simulations of heterogeneities on unstructured grids using methods of non-linear geostatistics. The objective of this work is the development of algorithms for simulating heterogeneities directly on unstructured grids without using intermediate fine scale regular grids and upscaling. We present two theoretical models for geostatistical simulations of continuous parameters on unstructured grids which are different generalizations of the Discrete Gaussian model (DGM) – DGM 1 and DGM 2. The proposed theoretical models enable converting the problem of geostatistical simulation on an unstructured grid into the well-studied problem of simulating multivariate Gaussian random vectors followed by application of block-dependent transformation functions. The problem of simulating facies is also addressed in this work, for which generalizations of pluri-Gaussian and truncated Gaussian simulation models for unstructured grids are proposed.An…

Advisors/Committee Members: Wackernagel, Hans (thesis director).

Subjects/Keywords: Maillage non-structuré; Simulation des hétérogénéités; Géostatistiques non-linéaires; Modèle Gaussien discret; Unstructured grids; Heterogeneities simulation; Non-linear geostatistics; Discrete Gaussian model; 551.015

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zaytsev, V. (2016). Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2016PSLEM094

Chicago Manual of Style (16^th Edition):

Zaytsev, Victor. “Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids.” 2016. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed March 02, 2021. http://www.theses.fr/2016PSLEM094.

MLA Handbook (7^th Edition):

Zaytsev, Victor. “Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids.” 2016. Web. 02 Mar 2021.

Vancouver:

Zaytsev V. Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2016. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2016PSLEM094.

Council of Science Editors:

Zaytsev V. Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés : Stochastic methods for modeling uncertainties on unstructured grids. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2016. Available from: http://www.theses.fr/2016PSLEM094

Université de Lorraine

23. Raguenel, Margaux. Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe.

Degree: Docteur es, Géosciences, 2019, Université de Lorraine

URL: http://www.theses.fr/2019LORR0338

► La quantification des ressources géologiques naturelles (huile, gaz, eau, dépôts minéraux, énergie géothermique, etc.) nécessite une compréhension et une description précises des hétérogénéités géologiques et… (more)

▼ La quantification des ressources géologiques naturelles (huile, gaz, eau, dépôts minéraux, énergie géothermique, etc.) nécessite une compréhension et une description précises des hétérogénéités géologiques et des processus physico-chimiques qui contrôlent leur formation, leur mise en place, leur préservation et leur récupération. Pour caractériser le comportement physique des réservoirs, des modèles géologiques en 2D, 3D et 4D servent de base aux simulations numériques. Un modèle numérique requiert l’intégration et l’homogénéisation de nombreuses données obtenues à différentes échelles. Cela exige hypothèses, choix et simplifications pour représenter la complexité des objets géologiques et des processus physiques avec un nombre limité de paramètres. Dans le cas des études de réservoirs géothermiques haute température, il faut faire face à la complexité géométrique et structurale liée aux environnements volcaniques et à la résolution de processus physiques couplés. Cela demande l’utilisation de recherches effectuées dans différents domaines, avec différents outils. L’interopérabilité entre ces outils théoriques et numériques est un défi. Ces travaux de thèse proposent de pallier ce problème en réalisant des modèles géologiques dont la complexité est préservée à l’aide de maillages non structurés et d’outils permettant de réaliser des simulations de processus physiques couplés réalistes. Des stratégies de conservation de l'intégrité d'un modèle structural sont proposées, respectant les données et l’organisation des structures géologiques. Différents outils ont été élaborés pour identifier et préserver ces structures jouant un rôle particulier dans les processus physiques, comme les couches, failles ou frontières d'un modèle. Une représentation numérique adaptée à la géologie (permise par la librairie RINGMesh utilisant les concepts géologiques dans la description du modèle numérique) préserve ces différents éléments depuis le géomodeleur (SKUA-GocadTM) jusqu’aux simulations physiques (CSMP++). Les outils créés sont inclus dans une chaîne intégrative, allant de la modélisation géologique aux simulations physiques, i.e. de la caractérisation de la géométrie des structures vers la quantification des ressources. Les méthodologies développées sont d’abord validées grâce à des solutions analytiques et appliquées sur des cas synthétiques. Elles sont ensuite utilisées pour comprendre l'évolution des processus thermohydrauliques dans le réservoir géothermique de Basse-Terre, Guadeloupe (cadre du programme GEOTREF). Une première étude menée en 2D compare le réalisme physique de différents scénarios géologiques possibles selon les données de terrain (profils de température et campagne magnétotellurique). Cette étude reproduit les profils de température observés pour deux scénarios étudiés, et semble exclure l’hypothèse de transferts latéraux de chaleur à l’échelle de l’île. Une seconde étude réalisée en 3D, avec une complexification progressive du modèle géologique, quantifie l'impact des structures sur le comportement physique… Advisors/Committee Members: Sausse, Judith (thesis director), Bonneau, François (thesis director).

Subjects/Keywords: Modélisation numérique 3D; Géologie intégrative; Simulations numériques; Géothermie; Maillages non structurés; Basse-Terre, Guadeloupe; 3D numerical modeling; Integrative geology; Numerical simulations; Geothermal energy; Unstructured grids; Basse-Terre, Guadeloupe; 551.015 118

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raguenel, M. (2019). Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2019LORR0338

Chicago Manual of Style (16^th Edition):

Raguenel, Margaux. “Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe.” 2019. Doctoral Dissertation, Université de Lorraine. Accessed March 02, 2021. http://www.theses.fr/2019LORR0338.

MLA Handbook (7^th Edition):

Raguenel, Margaux. “Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe.” 2019. Web. 02 Mar 2021.

Vancouver:

Raguenel M. Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe. [Internet] [Doctoral dissertation]. Université de Lorraine; 2019. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2019LORR0338.

Council of Science Editors:

Raguenel M. Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe : Modeling of thermo-hydraulic processes in fractured reservoirs on unstructured grids : application to the geothermal reservoir of Basse-Terre, Guadeloupe. [Doctoral Dissertation]. Université de Lorraine; 2019. Available from: http://www.theses.fr/2019LORR0338

24. Τρομπούκης, Ξενοφών. Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών.

Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/28180

►

The main objective of this PhD thesis was the development of software for the solution of large scale aerodynamic and aeroelastic problems, running on modern… (more)

▼

The main objective of this PhD thesis was the development of software for the solution of large scale aerodynamic and aeroelastic problems, running on modern Graphics Processing Units (GPUs). The developed GPU-enabled software solves the 2D/3D steady/unsteady Navier-Stokes/Euler equations for compressible fluids on dynamic unstructured/hybrid grids. Different programming approaches were programmed and assessed in terms of parallel speed-up. These approaches can easily be implemented in any other GPU-enabled software solving general purpose PDEs on unstructured grids. A mixed precision arithmetic (MPA) solver has been proposed. The use of MPA (instead of double precision arithmetic, DPA) reduces the total number of global memory accesses and, thus, increases the parallel efficiency of the GPU software without harming the accuracy of the solution. Though, the vertex-centered approach of the finite volume technique on unstructured grids is used, the use of the developed GPU-solver running on a single GPU instead of a CPU-solver running on a single core of a modern CPU may decrease the computational cost up to 110 times depending on the grid size and the compute capabilities of the GPU used. This substantial decrease of the required computational cost affects positively both the aerodynamic/aeroelastic analysis of aerodynamic bodies and the optimization-design via evolutionary algorithms (EAs), where a large number of evaluations must be performed. Thus the use of GPUs extends the range of industrial applications that can be carried out using CFD analysis tools. The fast and less accurate SPA and the relatively slower and accurate MPA variants of the GPU-solver are used in an EA-based hierarchical optimization method which is suitable for GPUs. Due to memory limitations, a single GPU cannot be used for solving large scale aerodynamic/aeroelastic problems. For large scale problems, GPU clusters are employed. In the present thesis, a single CPU-thread was used to control the available GPUs per computational node. The communication between the GPUs of the interconnected nodes is based on the MPI parallel protocol.

Στη διατριβή αυτή αναπτύχθηκε, προγραμματίστηκε, πιστοποιήθηκε και κυρίως βελτιστοποιήθηκε μία σειρά νέων εκδόσεων επιλυτών των εξ. Navier-Stokes/Euler, για 2Δ/3Δ ροές, συμπεριλαμβανομένων χρονικά μη-μόνιμων ροών και της χρήσης δυναμικά προσαρμοζόμενων υπολογιστικών πλεγμάτων σε επεξεργαστές καρτών γραφικών (GPUs). Ο GPU-επιλύτης χρησιμοποιήθηκε για την επίλυση μεγάλης κλίμακας αεροδυναμικών και αεροελαστικών προβλημάτων σε συστήματα υψηλής υπολογιστικής ισχύος αλλά σχετικά μικρού κόστους κτήσης. Αποτελέσματα της διατριβής που αποτελούν και στοιχεία πρωτοτυπίας είναι (α) η ανάδειξη τρόπων-τεχνικών προγραμματισμού υψηλής παράλληλης απόδοσης GPU-λογισμικού επίλυσης επιστημονικών προβλημάτων σε μη-δομημένα (υβριδικά) πλέγματα, είτε μέσω της βέλτιστης κατάτμησης των υπολογισμών σε παράλληλες διεργασίες που εκτελούνται σε GPUs, είτε μέσω της βέλτιστης διαχείρισης των μνημών της GPU. (β) Η χρήση αριθμητικής μικτής…

Subjects/Keywords: Υπολογιστική ρευστοδυναμική; Επεξεργαστές καρτών γραφικών; Αεροελαστικότητα; Μη-δομημένα πλέγματα; Παράλληλη επεξεργασία; Computational fluid dynamics (CFD); Graphics processing units (GPUs); GPGPU; Aerolasticity; Unstructured grids; Parallel computing

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Τρομπούκης, . �. (2012). Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/28180

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Τρομπούκης, Ξενοφών. “Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed March 02, 2021. http://hdl.handle.net/10442/hedi/28180.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Τρομπούκης, Ξενοφών. “Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών.” 2012. Web. 02 Mar 2021.

Vancouver:

Τρομπούκης �. Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10442/hedi/28180.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Τρομπούκης �. Αριθμητική επίλυση προβλημάτων αεροδυναμικής-αεροελαστικότητας σε επεξεργαστές καρτών γραφικών. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/28180

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Kaushik, Dinesh Kumar. Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids.

Degree: PhD, Computer Science, 2002, Old Dominion University

URL: 9780493883694 ; https://digitalcommons.odu.edu/computerscience_etds/111

► This dissertation studies the sources of poor performance in scientific computing codes based on partial differential equations (PDEs), which typically perform at a computational… (more)

▼ This dissertation studies the sources of poor performance in scientific computing codes based on partial differential equations (PDEs), which typically perform at a computational rate well below other scientific simulations (e.g., those with dense linear algebra or N-body kernels) on modern architectures with deep memory hierarchies. We identify that the primary factors responsible for this relatively poor performance are: insufficient available memory bandwidth, low ratio of work to data size (good algorithmic efficiency), and nonscaling cost of synchronization and gather/scatter operations (for a fixed problem size scaling). This dissertation also illustrates how to reuse the legacy scientific and engineering software within a library framework. Specifically, a three-dimensional unstructured grid incompressible Euler code from NASA has been parallelized with the Portable Extensible Toolkit for Scientific Computing (PETSc) library for distributed memory architectures. Using this newly instrumented code (called PETSc-FUN3D) as an example of a typical PDE solver, we demonstrate some strategies that are effective in tolerating the latencies arising from the hierarchical memory system and the network. Even on a single processor from each of the major contemporary architectural families, the PETSc-FUN3D code runs from 2.5 to 7.5 times faster than the legacy code on a medium-sized data set (with approximately 10⁵ degrees of freedom). The major source of performance improvement is the increased locality in data reference patterns achieved through blocking, interlacing, and edge reordering. To explain these performance gains, we provide simple performance models based on memory bandwidth and instruction issue rates. Experimental evidence, in terms of translation lookaside buffer (TLB) and data cache miss rates, achieved memory bandwidth, and graduated floating point instructions per memory reference, is provided through accurate measurements with hardware counters. The performance models and experimental results motivate algorithmic and software practices that lead to improvements in both parallel scalability and per-node performance. We identify the bottlenecks to scalability (algorithmic as well as implementation) for a fixed-size problem when the number of processors grows to several thousands (the expected level of concurrency on terascale architectures). We also evaluate the hybrid programming model (mixed distributed/shared) from a performance standpoint. Advisors/Committee Members: David Keyes, William Gropp, Alex Pothen, Chester Grosch, Mohammad Zubair.

Subjects/Keywords: Cache; Hybrid programming; Partial differential equations; Unstructured grids; Computer Sciences

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kaushik, D. K. (2002). Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids. (Doctoral Dissertation). Old Dominion University. Retrieved from 9780493883694 ; https://digitalcommons.odu.edu/computerscience_etds/111

Chicago Manual of Style (16^th Edition):

Kaushik, Dinesh Kumar. “Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids.” 2002. Doctoral Dissertation, Old Dominion University. Accessed March 02, 2021. 9780493883694 ; https://digitalcommons.odu.edu/computerscience_etds/111.

MLA Handbook (7^th Edition):

Kaushik, Dinesh Kumar. “Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids.” 2002. Web. 02 Mar 2021.

Vancouver:

Kaushik DK. Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids. [Internet] [Doctoral dissertation]. Old Dominion University; 2002. [cited 2021 Mar 02]. Available from: 9780493883694 ; https://digitalcommons.odu.edu/computerscience_etds/111.

Council of Science Editors:

Kaushik DK. Performance Modeling and Prediction for the Scalable Solution of Partial Differential Equations on Unstructured Grids. [Doctoral Dissertation]. Old Dominion University; 2002. Available from: 9780493883694 ; https://digitalcommons.odu.edu/computerscience_etds/111

26. Newman, James Charles, III. Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids.

Degree: MS, Mechanical & Aerospace Engineering, 1994, Old Dominion University

URL: https://digitalcommons.odu.edu/mae_etds/205

► The limiting factor in simulating flows past realistic configurations of interest has been the discretization of the physical domain on which the governing equations… (more)

▼ The limiting factor in simulating flows past realistic configurations of interest has been the discretization of the physical domain on which the governing equations of fluid flow may be solved. In an attempt to circumvent this problem, many Computational Fluid Dynamic (CFD) methodologies that are based on different grid generation and domain decomposition techniques have been developed. However, due to the costs involved and expertise required, very few comparative studies between these methods have been performed. In the present work, the two CFD methodologies which show the most promise for treating complex three-dimensional configurations as well as unsteady moving boundary problems are evaluated. These are namely the structured-overlapped and the unstructured grid schemes. Both methods use a cell centered, finite volume, upwind approach. The structured-overlapped algorithm uses an approximately factored, alternating direction implicit scheme to perform the time integration, whereas, the unstructured algorithm uses an explicit Runge-Kutta method. To examine the accuracy, efficiency, and limitations of each scheme, they are applied to the same steady complex multicomponent configurations and unsteady moving boundary problems. The steady complex cases consist of computing the subsonic flow about a two-dimensional high-lift multielement airfoil and the transonic flow about a three-dimensional wing/pylon/finned store assembly. The unsteady moving boundary problems are a forced pitching oscillation of an airfoil in a transonic freestream and a two-dimensional, subsonic airfoil/store separation sequence. Accuracy was accessed through the comparison of computed and experimentally measured pressure coefficient data on several of the wing/pylon/finned store assembly's components and at numerous angles-of-attack for the pitching airfoil. From this study, it was found that both the structured-overlapped and the unstructured grid schemes yielded flow solutions of comparable accuracy for these simulations. This study also indicated that, overall, the structured-overlapped scheme was slightly more CPU efficient than the unstructured approach. Advisors/Committee Members: O. Baysal, O. A. Kandil, N. T. Fink.

Subjects/Keywords: Flows; Simulations; Steady-complex; Unstructured grids; Fluid Dynamics; Mechanical Engineering; Structures and Materials

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Newman, James Charles, I. (1994). Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids. (Thesis). Old Dominion University. Retrieved from https://digitalcommons.odu.edu/mae_etds/205

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Newman, James Charles, III. “Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids.” 1994. Thesis, Old Dominion University. Accessed March 02, 2021. https://digitalcommons.odu.edu/mae_etds/205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Newman, James Charles, III. “Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids.” 1994. Web. 02 Mar 2021.

Vancouver:

Newman, James Charles I. Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids. [Internet] [Thesis]. Old Dominion University; 1994. [cited 2021 Mar 02]. Available from: https://digitalcommons.odu.edu/mae_etds/205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Newman, James Charles I. Flow Simulations About Steady-Complex and Unsteady Moving Configurations Using Structured-Overlapped and Unstructured Grids. [Thesis]. Old Dominion University; 1994. Available from: https://digitalcommons.odu.edu/mae_etds/205

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The Ohio State University

27. Kumar, Ankan. Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors.

Degree: PhD, Mechanical Engineering, 2009, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1230142666

► The focus of this thesis is the development of physical models and computational algorithms for the modeling of full-scale catalytic monolithic reactors. Surface reaction… (more)

▼ The focus of this thesis is the development of physical models and computational algorithms for the modeling of full-scale catalytic monolithic reactors. Surface reaction is the cornerstone of the operation of such devices, and diffusion is the only mode, locally, by which reactants are transported to the reacting surfaces. In the first part of the study, detailed numerical studies are performed for a representative channel of a typical monolithic reactor to explore the impact of different diffusion models on the simulation results. An optimum diffusion model, henceforth referred to as the Schmidt Number model, is identified for modeling of catalytic reactor operations, based on both accuracy as well as computational efficiency standpoints. In the second part of the thesis, a new low-memory solver for implicit coupled solution of the species conservation equations is developed. This solver, henceforth known as the IDD+GMRES solver, significantly enhances the stability and convergence of steady state CFD simulations, in comparison to the widely used segregated solution approach. The efficacy of this method is demonstrated using various test cases ranging from pure multi-component diffusion, homogenous combustion of hydrocarbons (laminar flames) and catalytic combustion in both two-dimensional and complex three-dimensional geometries. Use of the IDD+GMRES solver leads to up to 2.5 times reduction in overall computational time and up to 5 times reduction in the time taken by the solution of the species conservation equations, as compared to point implicit Block-Gauss Siedel solvers. In the third part of the thesis, acceleration of surface chemistry calculation is performed by adapting the In Situ Adaptive Tabulation (ISAT) algorithm for heterogeneous reactions. The ISAT algorithm for surface chemistry is developed from ground up and linked with the CFD code developed in the second part of the thesis. The use of the new ISAT algorithm is demonstrated for channel-scale modeling of catalytic combustion and three-way catalytic conversion and for a full-scale monolithic reactor model of catalytic combustion application. The use of the ISAT algorithm leads to an additional reduction in overall computational time between 50 percent and 150 percent for the cases studied, while speeding-up the surface chemistry calculations alone by up to 11 times. In the final step, developments resulting from both physical modeling studies and computational algorithm studies are integrated to perform modeling of full-scale monolithic reactors with complex chemistry. Key contributions of this thesis include investigation and identification of a diffusion model for catalytic monolithic reactor calculations, development of a new low-memory coupled implicit solver for the species conservation equations, the first reported study of the adaptation and use of the ISAT algorithm for large-scale CFD calculations with complex surface chemistry, and integration of all of the above models/algorithms into a single simulation… Advisors/Committee Members: Mazumder, Professor Sandip (Advisor).

Subjects/Keywords: Mechanical Engineering; Computational Fluid Dynamics; Catalysis; Heterogeneous Reactions; Unstructured Grids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kumar, A. (2009). Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1230142666

Chicago Manual of Style (16^th Edition):

Kumar, Ankan. “Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors.” 2009. Doctoral Dissertation, The Ohio State University. Accessed March 02, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1230142666.

MLA Handbook (7^th Edition):

Kumar, Ankan. “Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors.” 2009. Web. 02 Mar 2021.

Vancouver:

Kumar A. Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors. [Internet] [Doctoral dissertation]. The Ohio State University; 2009. [cited 2021 Mar 02]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1230142666.

Council of Science Editors:

Kumar A. Physical Models and Computational Algorithms for Simulation of Catalytic Monolithic Reactors. [Doctoral Dissertation]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1230142666

Texas A&M University

28. Sert, Cuneyt. Nonconforming formulations with spectral element methods.

Degree: PhD, Mechanical Engineering, 2004, Texas A&M University

URL: http://hdl.handle.net/1969.1/1268

► A spectral element algorithm for solution of the incompressible Navier-Stokes and heat transfer equations is developed, with an emphasis on extending the classical conforming Galerkin… (more)

Subjects/Keywords: Nonconforming grids; Unstructured grids; Spectral Element Method; SEM; Mortar Element Method; Constrained Approximation Method; hp-refinement

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sert, C. (2004). Nonconforming formulations with spectral element methods. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1268

Chicago Manual of Style (16^th Edition):

Sert, Cuneyt. “Nonconforming formulations with spectral element methods.” 2004. Doctoral Dissertation, Texas A&M University. Accessed March 02, 2021. http://hdl.handle.net/1969.1/1268.

MLA Handbook (7^th Edition):

Sert, Cuneyt. “Nonconforming formulations with spectral element methods.” 2004. Web. 02 Mar 2021.

Vancouver:

Sert C. Nonconforming formulations with spectral element methods. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1969.1/1268.

Council of Science Editors:

Sert C. Nonconforming formulations with spectral element methods. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/1268

Indian Institute of Science

29. Prakash, C Edmond. Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids.

Degree: PhD, Faculty of Engineering, 2012, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1652

Subjects/Keywords: Grids - Graphic Design; Algorithms; Computer Programming; Computer Graphics; Unstructured Grids; Coherent Voxelization Algorithm; Voxel Data; Voxelizatlon; Computer Science

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prakash, C. E. (2012). Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1652

Chicago Manual of Style (16^th Edition):

Prakash, C Edmond. “Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids.” 2012. Doctoral Dissertation, Indian Institute of Science. Accessed March 02, 2021. http://etd.iisc.ac.in/handle/2005/1652.

MLA Handbook (7^th Edition):

Prakash, C Edmond. “Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids.” 2012. Web. 02 Mar 2021.

Vancouver:

Prakash CE. Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2012. [cited 2021 Mar 02]. Available from: http://etd.iisc.ac.in/handle/2005/1652.

Council of Science Editors:

Prakash CE. Parallel Voxelization Algorithms For Volume Rendering Of Unstructured Grids. [Doctoral Dissertation]. Indian Institute of Science; 2012. Available from: http://etd.iisc.ac.in/handle/2005/1652

Georgia Tech

30. Acikgoz, Nazmiye. Adaptive and Dynamic Meshing Methods for Numerical Simulations.

Degree: PhD, Aerospace Engineering, 2007, Georgia Tech

URL: http://hdl.handle.net/1853/14521

► For the numerical simulation of many problems of engineering interest, it is desirable to have an automated mesh adaption tool. This is important especially for… (more)

▼ For the numerical simulation of many problems of engineering interest, it is desirable to have an automated mesh adaption tool. This is important especially for problems characterized by anisotropic features and require mesh clustering in the direction of high gradients. Another significant issue in meshing emerges in unsteady simulations with moving boundaries, where the boundary motion has to be accommodated by deforming the computational grid. Similarly, there exist problems where current mesh needs to be adapted to get more accurate solutions. To solve these problems, we propose three novel procedures. In the first part of this work, we present an optimization procedure for three-dimensional anisotropic tetrahedral grids based on metric-driven h-adaptation. Through the use of topological and geometrical operators, the mesh is iteratively adapted until the final mesh minimizes a given objective function. We propose an optimization process based on an ad-hoc application of the simulated annealing technique, which improves the likelihood of removing poor elements from the grid. Moreover, a local implementation of the simulated annealing is proposed to reduce the computational cost. Many challenging unsteady multi-physics problems are characterized by moving boundaries and/or interfaces. When the boundary displacements are large, degenerate elements are easily formed in the grid such that frequent remeshing is required. We propose a new r-adaptation technique that is valid for all types of elements (e.g., triangle, tet, quad, hex, hybrid) and deforms grids that undergo large imposed displacements at their boundaries. A grid is deformed using a network of linear springs composed of edge springs and a set of virtual springs. The virtual springs are constructed in such a way as to oppose element collapsing. Both frequent remeshing, and exact-pinpointing of clustering locations are great challenges of numerical simulations, which can be overcome by adaptive meshing algorithms. Therefore, we conclude this work by defining a novel mesh adaptation technique where the entire mesh is adapted upon application of a force field in order to comply with the target mesh or to get more accurate solutions. The method has been tested for two-dimensional problems of a-priori metric definitions as well as for oblique shock clusterings. Advisors/Committee Members: Bottasso, Carlo (Committee Chair), Dieci, Luca (Committee Member), Ruffin, Stephen (Committee Member), Rusak, Zvi (Committee Member), Sankar, Lakshmi (Committee Member).

Subjects/Keywords: Unstructured grids; Ball-vertex method; Fluid structure interaction; Computational fluid dynamics; Anisotropic grids; Mesh adaptation; Numerical grid generation (Numerical analysis); Boundary value problems; Mathematical optimization Computer programs

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Acikgoz, N. (2007). Adaptive and Dynamic Meshing Methods for Numerical Simulations. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14521

Chicago Manual of Style (16^th Edition):

Acikgoz, Nazmiye. “Adaptive and Dynamic Meshing Methods for Numerical Simulations.” 2007. Doctoral Dissertation, Georgia Tech. Accessed March 02, 2021. http://hdl.handle.net/1853/14521.

MLA Handbook (7^th Edition):

Acikgoz, Nazmiye. “Adaptive and Dynamic Meshing Methods for Numerical Simulations.” 2007. Web. 02 Mar 2021.

Vancouver:

Acikgoz N. Adaptive and Dynamic Meshing Methods for Numerical Simulations. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1853/14521.

Council of Science Editors:

Acikgoz N. Adaptive and Dynamic Meshing Methods for Numerical Simulations. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/14521

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations