subject:(Moving mesh)

University of Cincinnati

1. Clack, Jhules. Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization.

Degree: PhD, Arts and Sciences: Mathematical Sciences, 2014, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1418910272

► Meshfree and, in particular Moving Least Square (MLS) schemes have been used to solve a widerange of partial differential equation problems. It is hoped that… (more)

Subjects/Keywords: Mathematics; mesh refinement; Moving Least Square

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APA (6^th Edition):

Clack, J. (2014). Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1418910272

Chicago Manual of Style (16^th Edition):

Clack, Jhules. “Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization.” 2014. Doctoral Dissertation, University of Cincinnati. Accessed April 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1418910272.

MLA Handbook (7^th Edition):

Clack, Jhules. “Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization.” 2014. Web. 16 Apr 2021.

Vancouver:

Clack J. Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization. [Internet] [Doctoral dissertation]. University of Cincinnati; 2014. [cited 2021 Apr 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1418910272.

Council of Science Editors:

Clack J. Theoretical Analysis for Moving Least Square Method with Second Order Pseudo-Derivatives and Stabilization. [Doctoral Dissertation]. University of Cincinnati; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1418910272

King Abdullah University of Science and Technology

2. AbuAlSaud, Moataz. Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/244571

► The purpose of this thesis is to solve unsteady two-dimensional compressible Navier-Stokes equations for a moving mesh using implicit explicit (IMEX) Runge- Kutta scheme. The… (more)

Subjects/Keywords: Simulation; Compressible flows; Runge-Kutta; Curvilinear mesh; Implicit-explicit; Moving mesh

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

APA (6^th Edition):

AbuAlSaud, M. (2012). Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/244571

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):

AbuAlSaud, Moataz. “Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/244571.

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

MLA Handbook (7^th Edition):

AbuAlSaud, Moataz. “Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method.” 2012. Web. 16 Apr 2021.

Vancouver:

AbuAlSaud M. Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/244571.

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

Council of Science Editors:

AbuAlSaud M. Simulation of 2-D Compressible Flows on a Moving Curvilinear Mesh with an Implicit-Explicit Runge-Kutta Method. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/244571

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

Brunel University

3. Almurshedi, Ahmed. Alternative plate deformation phenomenon for squeeze film levitation.

Degree: PhD, 2018, Brunel University

URL: http://bura.brunel.ac.uk/handle/2438/17120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765050

► This thesis deals with a theoretical and an experimental exploration of squeeze film levitation (SFL) of light objects. The investigations aimed to find the important… (more)

▼ This thesis deals with a theoretical and an experimental exploration of squeeze film levitation (SFL) of light objects. The investigations aimed to find the important design parameters controlling this levitation mechanism and also to suggest an alternative way to implement SFL. The study, through computer modelling and experimental validation, focused on Poisson's contraction effect for generating SFL. A finite element model (ANSYS) was verified by experimental testing of five different plate designs. Each plate was subjected to a uniaxial plain stress by an arrangement of two hard piezoelectric actuators (PZT) bonded to the bottom of the plate and driven with DC or AC voltages. It was observed that pulsation of a dimple or crest shaped elastic deformation along the longitudinal axis in the central area of the plate was created because of Poisson's contraction. This Poisson's effect generated the squeeze-film between the plate and the levitated object. The separation distance between a floating lightweight object and the plate was analysed using computational fluid dynamics (ANSYS CFX) through creation of a modelling model for the air-film entrapped between the two interacting surfaces - a typical three-dimensional fluid-solid interaction system (FSI). Additionally, the levitation distance has been experimentally measured by a Laser Sensor. A satisfactory agreement has been found between model predictions and experimental results. Two levitation systems, one based on a horn transducer (Langevin type) and the other one in the form of a plain rectangular plate made of Aluminium and firmly fastened at both ends with a surface-mounted piezoelectric actuator, were compared in this thesis. Both devices were based on SFL mechanism. Evidently, the performances of both designs were greatly influenced by the design structure and in particular by the driving plate characteristics such as plate size and geometry as well as the driving boundary conditions. To this end, physical experiments were carried out and it was found that the device utilising horn-type transducer yields better levitation performance. Ultimately, the research explained the confusion between three approaches to non-contact levitation through literature review and also pointed out some essential parameters like piezoelectric actuators location, material of the driving structure, coupled-field between the actuators and the driving structure and the fluid-solid interface that was existed between the excited plate and the levitated object.

Subjects/Keywords: 621.8; Novel conveyor; Structural blending; Structural stress and strain; Fluid flow; Moving mesh; Deforming mesh

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APA (6^th Edition):

Almurshedi, A. (2018). Alternative plate deformation phenomenon for squeeze film levitation. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/17120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765050

Chicago Manual of Style (16^th Edition):

Almurshedi, Ahmed. “Alternative plate deformation phenomenon for squeeze film levitation.” 2018. Doctoral Dissertation, Brunel University. Accessed April 16, 2021. http://bura.brunel.ac.uk/handle/2438/17120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765050.

MLA Handbook (7^th Edition):

Almurshedi, Ahmed. “Alternative plate deformation phenomenon for squeeze film levitation.” 2018. Web. 16 Apr 2021.

Vancouver:

Almurshedi A. Alternative plate deformation phenomenon for squeeze film levitation. [Internet] [Doctoral dissertation]. Brunel University; 2018. [cited 2021 Apr 16]. Available from: http://bura.brunel.ac.uk/handle/2438/17120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765050.

Council of Science Editors:

Almurshedi A. Alternative plate deformation phenomenon for squeeze film levitation. [Doctoral Dissertation]. Brunel University; 2018. Available from: http://bura.brunel.ac.uk/handle/2438/17120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765050

Delft University of Technology

4. Wang, Boyao (author). CFD modeling for moving jet penetrating cohesive soil.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

►

<p class="MsoNormal">In dredging operation, the high-pressure water jet is widely used for the excavation of soil. To study the jetting process and optimize the dredging… (more)

▼

<p class="MsoNormal">In dredging operation, the high-pressure water jet is widely used for the excavation of soil. To study the jetting process and optimize the dredging devices, the moving vertical water jet penetrating cohesive soil experiments were carried out by Nobel (2013). However, in terms of the design optimization for the dredging devices, it is not easy to change the jet scale and soil properties during the experiment due to time and economic constraints. Some detailed physics during the jetting process, e.g. pressure on the soil surface and shear plane inside the soil during jetting, were also not monitored during the experiment. Therefore, numerical simulation is chosen to optimize the design of dredging devices and study the physics of the jetting process. A CFD (computational fluid dynamics) numerical model is built to simulate the moving jet penetrating cohesive soil. The soil is modeled as a Bingham plastic. The sediment transport is modeled by using drift-flux model. The moving jet modeling is achieved by using dynamic mesh algorithms AMI (arbitrary mesh interface) and A/R (cell layer addition removal). The CFD numerical model has been validated with the experiment of Nobel. After the validation, an analysis of the jetting process based on this CFD model is accomplished proving that the CFD model can reveal the details of the soil failure process during jetting. This thesis work reveals that it is possible to describe the hydraulic excavation of cohesive soil with reasonable accuracy using CFD numerical model. The CFD model can also reveal the details of the soil failure process that could not be retrieved from the experiment. Since the model is generic, it can be applied for a jet bar with multiple nozzles. This is helpful to improve the design of dredging equipment, optimize the operational settings and estimate the production.

Offshore and Dredging Engineering

Advisors/Committee Members: Keetels, Geert (mentor), Jarquin Laguna, Antonio (graduation committee), van Zuijlen, Alexander (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: CFD; cohesive soil; Moving jet; dynamic mesh; Drift-flux model

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APA (6^th Edition):

Wang, B. (. (2019). CFD modeling for moving jet penetrating cohesive soil. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

Chicago Manual of Style (16^th Edition):

Wang, Boyao (author). “CFD modeling for moving jet penetrating cohesive soil.” 2019. Masters Thesis, Delft University of Technology. Accessed April 16, 2021. http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1.

MLA Handbook (7^th Edition):

Wang, Boyao (author). “CFD modeling for moving jet penetrating cohesive soil.” 2019. Web. 16 Apr 2021.

Vancouver:

Wang B(. CFD modeling for moving jet penetrating cohesive soil. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Apr 16]. Available from: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1.

Council of Science Editors:

Wang B(. CFD modeling for moving jet penetrating cohesive soil. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

University of New South Wales

5. Lee, Ann. Numerical study of heat transfer enhancement in micro-channels using synthetic jets.

Degree: Mechanical & Manufacturing Engineering, 2011, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/51501 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10188/SOURCE02?view=true

► High performance electronic devices have been reported to approach 1MW/m2 so that current heat dissipation devices will not be able to cope with increasing heat… (more)

▼ High performance electronic devices have been reported to approach 1MW/m2 so that current heat dissipation devices will not be able to cope with increasing heat flux. It has therefore been proposed that in order to manage the ever-increasing heat rejection demands, it will be necessary to have cooling fluid flowing through microchannels equipped with synthetic jets.To account for the deflection of the membrane of the synthetic jet actuator, a novel moving mesh algorithm has been developed. The solution methodology has been validated by comparing the velocity fields generated by the in-house code against experimental data. The conjugate heat transfer problem is solved by determining the temperature distributions in a heated solid and the fluid flowing in the microchannel attached to a silicon wafer microchip. It is shown that 2D studies overestimated the cooling effect, so that 3D effects must be included to properly assess potential of synthetic jets. The use of synthetic jet in cross flow was shown to yield similar results whether constant properties or variable properties were used. However, results obtained with constant properties were slightly more conservative, which coupled with advantages of reduced computational resources and CPU time, meant that constant properties were used in the majority of calculations. A wide range of parametric studies was performed using one jet with varying heat fluxes, actuator diaphragm amplitudes and frequencies. The hot regions in the silicon wafer resulting from the fluid flowing undisturbed in a microchannel are removed when the synthetic jet is switched on thereby significantly lowering the maximum temperature in the wafer. The advantage of higher diaphragm amplitudes is the creation of larger mixing regions and stronger vortices, thereby making cooling operation of the synthetic jet more effective. Similarly, increasing the frequency of the diaphragm leads to an increase of heat transfer enhancement. A parametric study was performed with the two jets being in phase and 180 degree out of phase at various operating frequencies and diaphragm amplitudes in order to create a more uniform heat transfer from the wafer. Out of several frequencies studied, the addition of an extra actuator produced more significant effect at a frequency of 560Hz whether the jets was in or out of phase. It follows that the optimal frequency depends on the jet arrangement. Advisors/Committee Members: Victoria, Timchenko, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Guan Heng, Yeoh, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, John Arthur, Reizes, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Conjugate heat transfer; Micro-channel; Synthetic jets; Moving mesh

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APA (6^th Edition):

Lee, A. (2011). Numerical study of heat transfer enhancement in micro-channels using synthetic jets. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51501 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10188/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Lee, Ann. “Numerical study of heat transfer enhancement in micro-channels using synthetic jets.” 2011. Doctoral Dissertation, University of New South Wales. Accessed April 16, 2021. http://handle.unsw.edu.au/1959.4/51501 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10188/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Lee, Ann. “Numerical study of heat transfer enhancement in micro-channels using synthetic jets.” 2011. Web. 16 Apr 2021.

Vancouver:

Lee A. Numerical study of heat transfer enhancement in micro-channels using synthetic jets. [Internet] [Doctoral dissertation]. University of New South Wales; 2011. [cited 2021 Apr 16]. Available from: http://handle.unsw.edu.au/1959.4/51501 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10188/SOURCE02?view=true.

Council of Science Editors:

Lee A. Numerical study of heat transfer enhancement in micro-channels using synthetic jets. [Doctoral Dissertation]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/51501 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10188/SOURCE02?view=true

University of Manchester

6. Prinja, Gaurav Kant. Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations.

Degree: 2010, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:101622

►

In this thesis our primary interest is in developing adaptive solution methods for parabolic and elliptic partial differential equations. The convection-diffusion equation is used as… (more)

▼

In this thesis our primary interest is in developing adaptive solution methods for parabolic and elliptic partial differential equations. The convection-diffusion equation is used as a representative test problem. Investigations are made into adaptive temporal solvers implementing only a few changes to existing software. This includes a comparison of commercial code against some more academic releases. A novel way to select step sizes for an adaptive BDF2 code is introduced. A chapter is included introducing some functional analysis that is required to understand aspects of the finite element method and error estimation. Two error estimators are derived and proofs of their error bounds are covered. A new finite element package is written, implementing a rather interesting error estimator in one dimension to drive a rather standard refinement/coarsening type of adaptivity. This is compared to a commercially available partial differential equation solver and an investigation into the properties of the two inspires the development of a new method designed to very quickly and directly equidistribute the errors between elements. This new method is not really a refinement technique but doesn't quite fit the traditional description of a moving mesh either. We show that this method is far more effective at equidistribution of errors than a simple moving mesh method and the original simple adaptive method. A simple extension of the new method is proposed that would be a mesh reconstruction method. Finally the new code is extended to solve steady-state problems in two dimensions. The mesh refinement method from one dimension does not offer a simple extension, so the error estimator is used to supply an impression of the local topology of the error on each element. This in turn allows us to develop a new anisotropic refinement algorithm, which is more in tune with the nature of the error on the parent element. Whilst the benefits observed in one dimension are not directly transferred into the two-dimensional case, the obtained meshes seem to better capture the topology of the solution.

A CD-ROM is submitted in a pocket attached to the inside back cover of the print version of the thesis. The CD-ROM contains: Two software packages (BFEM1D and BFEM2D) written for this thesis and used to generate some results; Some additional codes for generating results; A text file explaining the contents ofthe CD-ROM.

Advisors/Committee Members: SHARDLOW, TONY T, Silvester, David, Shardlow, Tony.

Subjects/Keywords: Partial Differential Equations; Mesh Moving; Mesh Moving; Finite element method; Mesh reconstruction

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

APA (6^th Edition):

Prinja, G. K. (2010). Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:101622

Chicago Manual of Style (16^th Edition):

Prinja, Gaurav Kant. “Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations.” 2010. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:101622.

MLA Handbook (7^th Edition):

Prinja, Gaurav Kant. “Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations.” 2010. Web. 16 Apr 2021.

Vancouver:

Prinja GK. Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2021 Apr 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:101622.

Council of Science Editors:

Prinja GK. Adaptive Solvers for Elliptic and Parabolic Partial Differential Equations. [Doctoral Dissertation]. University of Manchester; 2010. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:101622

University of Manchester

7. Prinja, Gaurav Kant. Adaptive solvers for elliptic and parabolic partial differential equations.

Degree: PhD, 2010, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/adaptive-solvers-for-elliptic-and-parabolic-partial-differential-equations(f0894eb2-9e06-41ff-82fd-a7bde36c816c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527187

► In this thesis our primary interest is in developing adaptive solution methods for parabolic and elliptic partial differential equations. The convection-diffusion equation is used as… (more)

▼ In this thesis our primary interest is in developing adaptive solution methods for parabolic and elliptic partial differential equations. The convection-diffusion equation is used as a representative test problem. Investigations are made into adaptive temporal solvers implementing only a few changes to existing software. This includes a comparison of commercial code against some more academic releases. A novel way to select step sizes for an adaptive BDF2 code is introduced. A chapter is included introducing some functional analysis that is required to understand aspects of the finite element method and error estimation. Two error estimators are derived and proofs of their error bounds are covered. A new finite element package is written, implementing a rather interesting error estimator in one dimension to drive a rather standard refinement/coarsening type of adaptivity. This is compared to a commercially available partial differential equation solver and an investigation into the properties of the two inspires the development of a new method designed to very quickly and directly equidistribute the errors between elements. This new method is not really a refinement technique but doesn't quite fit the traditional description of a moving mesh either. We show that this method is far more effective at equidistribution of errors than a simple moving mesh method and the original simple adaptive method. A simple extension of the new method is proposed that would be a mesh reconstruction method. Finally the new code is extended to solve steady-state problems in two dimensions. The mesh refinement method from one dimension does not offer a simple extension, so the error estimator is used to supply an impression of the local topology of the error on each element. This in turn allows us to develop a new anisotropic refinement algorithm, which is more in tune with the nature of the error on the parent element. Whilst the benefits observed in one dimension are not directly transferred into the two-dimensional case, the obtained meshes seem to better capture the topology of the solution.

Subjects/Keywords: 510; Partial Differential Equations; Mesh Moving; Mesh Moving; Finite element method; Mesh reconstruction

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

APA (6^th Edition):

Prinja, G. K. (2010). Adaptive solvers for elliptic and parabolic partial differential equations. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/adaptive-solvers-for-elliptic-and-parabolic-partial-differential-equations(f0894eb2-9e06-41ff-82fd-a7bde36c816c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527187

Chicago Manual of Style (16^th Edition):

Prinja, Gaurav Kant. “Adaptive solvers for elliptic and parabolic partial differential equations.” 2010. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. https://www.research.manchester.ac.uk/portal/en/theses/adaptive-solvers-for-elliptic-and-parabolic-partial-differential-equations(f0894eb2-9e06-41ff-82fd-a7bde36c816c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527187.

MLA Handbook (7^th Edition):

Prinja, Gaurav Kant. “Adaptive solvers for elliptic and parabolic partial differential equations.” 2010. Web. 16 Apr 2021.

Vancouver:

Prinja GK. Adaptive solvers for elliptic and parabolic partial differential equations. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2021 Apr 16]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/adaptive-solvers-for-elliptic-and-parabolic-partial-differential-equations(f0894eb2-9e06-41ff-82fd-a7bde36c816c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527187.

Council of Science Editors:

Prinja GK. Adaptive solvers for elliptic and parabolic partial differential equations. [Doctoral Dissertation]. University of Manchester; 2010. Available from: https://www.research.manchester.ac.uk/portal/en/theses/adaptive-solvers-for-elliptic-and-parabolic-partial-differential-equations(f0894eb2-9e06-41ff-82fd-a7bde36c816c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527187

University of Kansas

8. Kolasinski, Avary Justice. Surface and bulk moving mesh methods based on equidistribution and alignment.

Degree: PhD, Mathematics, 2019, University of Kansas

URL: http://hdl.handle.net/1808/29886

► In this dissertation, we first present a new functional for variational mesh generation and adaptation that is formulated by combining the equidistribution and alignment conditions… (more)

Subjects/Keywords: Applied mathematics; Mathematics; Discretization; Mesh adaptation; Numerical analysis; Partial differential equations; Scientific computing; Surface moving mesh methods

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

APA (6^th Edition):

Kolasinski, A. J. (2019). Surface and bulk moving mesh methods based on equidistribution and alignment. (Doctoral Dissertation). University of Kansas. Retrieved from http://hdl.handle.net/1808/29886

Chicago Manual of Style (16^th Edition):

Kolasinski, Avary Justice. “Surface and bulk moving mesh methods based on equidistribution and alignment.” 2019. Doctoral Dissertation, University of Kansas. Accessed April 16, 2021. http://hdl.handle.net/1808/29886.

MLA Handbook (7^th Edition):

Kolasinski, Avary Justice. “Surface and bulk moving mesh methods based on equidistribution and alignment.” 2019. Web. 16 Apr 2021.

Vancouver:

Kolasinski AJ. Surface and bulk moving mesh methods based on equidistribution and alignment. [Internet] [Doctoral dissertation]. University of Kansas; 2019. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1808/29886.

Council of Science Editors:

Kolasinski AJ. Surface and bulk moving mesh methods based on equidistribution and alignment. [Doctoral Dissertation]. University of Kansas; 2019. Available from: http://hdl.handle.net/1808/29886

University of Cambridge

9. Cheng, Zekang. A moving mesh method for non-isothermal multiphase flows.

Degree: PhD, 2019, University of Cambridge

URL: https://doi.org/10.17863/CAM.35929 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767781

► In this thesis, a numerical method is developed for simulating non-isothermal multiphase flows, which are important in many technical applications such as crystal growth and… (more)

▼ In this thesis, a numerical method is developed for simulating non-isothermal multiphase flows, which are important in many technical applications such as crystal growth and welding. The method is based on the arbitrary Lagrangian Eulerian method of Li (2013). The interface is represented explicitly by mesh lines, and is tracked by an adaptive moving unstructured mesh. The P2-P1d finite element method (FEM) is used for discretisation and the incompressible Navier-Stokes equations are solved by the uzawa method. Firstly, a thorough study is presented on the method's capability in numerically representing the force balance condition on the interface. An inaccurate representation of this condition induces the non-physical spurious currents, which degrade the simulation accuracy especially when the viscous damping is weak (small Ohnesorge number, Oh). For the example of a circular/spherical droplet, the interfacial tension and the associated pressure jump are exactly balanced numerically and thus the static Laplace solution exists in our method. The stability of this solution is examined numerically. The amplitude of the dimensionless spurious currents is found to be around 10⁻¹⁵ for Oh ≥ 10⁻³ . Another benchmark test is the axisymmetric oscillation of a freesurface droplet/bubble. The simulation results are in good agreement with the analytical solution for Oh = 10⁻³. This is by far the first successful simulation of droplet/bubble oscillation with such weak viscous damping and it demonstrates the ability of our method in simulating flows with strong capillary forces. Secondly, a numerical treatment of interface topology changes is incorporated into our method for studying problems with interface breakup. Thanks to the adaptive mesh generator, the thin region between the interface boundary and another boundary consists of one layer of elements. The interface topology change is performed once the minimum distance between the two boundaries falls below a pre-set scale l_breakup . The numerical implementation is verified through two different examples: dripping faucet and droplet coalescence. Remarkably good agreement has been obtained with the experimental results. The simulation of the low Oh dripping problem shows both the accuracy and robustness of our method. The simulation of droplet coalescence demonstrates the great advantage of our method in solving problems with a large disparity in length scales. Finally, an FEM solver for temperature is developed and the non-isothermal effects are included in our method for the purpose of simulating non-isothermal multiphase flows. The modified method is validated to be accurate through three benchmark examples: natural convection in a cavity, thermocapillary convection of two layers, and droplet migration subject to a temperature gradient. Our method is then applied to investigate the liquid bridge breakup with thermocapillary effect. The non-isothermal liquid bridge breakup in the viscous and inertial regimes are studied. It has been found that the…

Subjects/Keywords: 621.402; moving mesh; FEM; multiphase flows; droplet; bubble; thermocapillarity; fluid dynamics; computational fluid dynamics

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

APA (6^th Edition):

Cheng, Z. (2019). A moving mesh method for non-isothermal multiphase flows. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.35929 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767781

Chicago Manual of Style (16^th Edition):

Cheng, Zekang. “A moving mesh method for non-isothermal multiphase flows.” 2019. Doctoral Dissertation, University of Cambridge. Accessed April 16, 2021. https://doi.org/10.17863/CAM.35929 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767781.

MLA Handbook (7^th Edition):

Cheng, Zekang. “A moving mesh method for non-isothermal multiphase flows.” 2019. Web. 16 Apr 2021.

Vancouver:

Cheng Z. A moving mesh method for non-isothermal multiphase flows. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Apr 16]. Available from: https://doi.org/10.17863/CAM.35929 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767781.

Council of Science Editors:

Cheng Z. A moving mesh method for non-isothermal multiphase flows. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://doi.org/10.17863/CAM.35929 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767781

Mississippi State University

10. 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

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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 April 16, 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. 16 Apr 2021.

Vancouver:

Blades EL. A Sliding Interface Method for Unsteady Unstructured Parallel Flow Simulations. [Internet] [Doctoral dissertation]. Mississippi State University; 2004. [cited 2021 Apr 16]. 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/ ;

Penn State University

11. Feng, Weiming. PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES.

Degree: 2009, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/9861

► A basic interest in materials science is the determination of microstructures of materials in order to understand why materials have the properties they exhibit and… (more)

▼ A basic interest in materials science is the determination of microstructures of materials in order to understand why materials have the properties they exhibit and how these properties can be controlled to serve technological uses. In this dissertation, the phase-field approach is combined with other models and algorithms to study the effect of elastic energy, anisotropic mobility and structural defects on phase separation kinetics and morphological evolution in bulk systems. A multi-dimensional general phase-field model has been developed by combining the iteration method for calculating the elastic energy and a semi-implicit spectral method for solving the Cahn–Hilliard equation. The model can efficiently calculate the microstructure evolution for systems with rather general elastic anisotropies, arbitrarily large elastic inhomogeneity, general misfit strain, and large anisotropic mobility. The microstructure and structure functions have been studied to show the effect of large anisotropic mobility together with the elastic energy. To address the challenge of large scale simulations of microstructures which are still computationally expensive to date, an adaptive semi-implicit Fourier spectral (AFSIM) method is developed to solve Allen-Cahn equation by making grid points spatially adaptive in the physical domain via a moving mesh strategy, while maintaining a uniform grid in the computational domain for the spectral implementation. The moving mesh method is adopted since it is particularly efficient among recent efforts in developing advanced numerical algorithms. The newly developed approach not only provides more accurate treatment at the interfaces requiring higher resolution, but also retains the numerical efficiency of the semi-implicit Fourier spectral method. Numerical examples using the adaptive moving mesh semi-implicit Fourier spectral method are presented for both two and three space dimensional microstructure simulations, and they are compared with those obtained by other methods. By maintaining similar accuracy, the proposed method is shown to be far more efficient than the existing methods for microstructures with small ratios of interfacial width to the domain size. The AFSIM is further implemented to solve Cahn-Hilliard equation with inhomogeneous, anisotropic elasticity. Numerical implementations and test examples in both two and three dimensions are considered with a particular illustration using the well-studied example of mis-fitting particles in a solid as they approach to their equilibrium shapes. It is shown that significant savings in memory and computational time is achieved while accurate solutions are preserved. The dynamics of the structure defects such as dislocations generally control the material properties during non-equilibrium processing. In phase-fields description, the dislocations exist only along the dislocations lines parallel to the slip planes. The total dislocation line length to volume ratio in dislocation motion is expected to be significantly smaller than the total… Advisors/Committee Members: Long Chen, Dissertation Advisor/Co-Advisor, Long Qing Chen, Committee Chair/Co-Chair, Zi Kui Liu, Committee Member, Qiang Du, Committee Member, Padma Raghavan, Committee Member.

Subjects/Keywords: phase-field; microstructure; moving mesh; anisotropic mobility

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

APA (6^th Edition):

Feng, W. (2009). PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/9861

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):

Feng, Weiming. “PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES.” 2009. Thesis, Penn State University. Accessed April 16, 2021. https://submit-etda.libraries.psu.edu/catalog/9861.

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

MLA Handbook (7^th Edition):

Feng, Weiming. “PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES.” 2009. Web. 16 Apr 2021.

Vancouver:

Feng W. PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES. [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Apr 16]. Available from: https://submit-etda.libraries.psu.edu/catalog/9861.

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

Council of Science Editors:

Feng W. PHASE-FIELD MODELS OF MICROSTRUCTURE EVOLUTION AND NEW NUMERICAL STRATEGIES. [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/9861

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

12. Marsooli, Reza. 3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds.

Degree: PhD, Civil Engineering, 2013, University of Mississippi

URL: https://egrove.olemiss.edu/etd/330

► Irvin Cooper was a prominent music educator in boys’ adolescent voice change research. Dr. Cooper developed the Cambiata concept as a method for teaching boys… (more)

Subjects/Keywords: 3-D Numerical Modeling; Dam-Break Flow; Movable Bed; Moving Mesh; Sediment Transport; Volume Of Fluid; Civil Engineering

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

APA (6^th Edition):

Marsooli, R. (2013). 3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds. (Doctoral Dissertation). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/330

Chicago Manual of Style (16^th Edition):

Marsooli, Reza. “3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds.” 2013. Doctoral Dissertation, University of Mississippi. Accessed April 16, 2021. https://egrove.olemiss.edu/etd/330.

MLA Handbook (7^th Edition):

Marsooli, Reza. “3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds.” 2013. Web. 16 Apr 2021.

Vancouver:

Marsooli R. 3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds. [Internet] [Doctoral dissertation]. University of Mississippi; 2013. [cited 2021 Apr 16]. Available from: https://egrove.olemiss.edu/etd/330.

Council of Science Editors:

Marsooli R. 3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds. [Doctoral Dissertation]. University of Mississippi; 2013. Available from: https://egrove.olemiss.edu/etd/330

13. Zancanaro Junior, Flavio Vanderlei. Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos.

Degree: 2014, Brazil

URL: http://hdl.handle.net/10183/109158

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Desde o seu surgimento o motor de combustão interna é a alternativa de fornecimento de potência mais utilizada no mundo em veículos de passeio e… (more)

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Desde o seu surgimento o motor de combustão interna é a alternativa de fornecimento de potência mais utilizada no mundo em veículos de passeio e transporte de cargas. De fato, observa-se no dia-a-dia uma forte dependência da utilização de motores e, atualmente, os estudos visando o seu aumento de eficiência e a diminuição de emissões poluentes estão cada vez mais intensos. Com os grandes avanços ocorridos na disponibilização de computadores, existe uma tendência contínua para a utilização de técnicas computacionais auxiliando no projeto de motores. No entanto, o maior desafio é simular o escoamento altamente tridimensional, turbulento e transiente, com o uso de modelos de turbulência e combustão, que tenham bom compromisso com a física envolvida. Neste âmbito, o presente trabalho tem o objetivo de desenvolver uma validação de metodologias numérica e experimental, para avaliar o comportamento dinâmico e reativo do escoamento em motores de combustão interna. A simulação é aplicada a um motor Honda GX35, que possui vasto uso comercial em roçadeiras, motocicletas de baixo custo e, atualmente, em Veículos Autônomos Não Tripulados (VANT), dentre outros. A análise tem como base soluções numéricas pelo método dos volumes finitos, usando o programa comercial Star-cd/es-ice. Para resolver o escoamento turbulento o modelo adotado foi o k-ω SST, com aproximação para baixo Reynolds e tratamento de parede híbrido. O modelo de combustão ECFM-3Z foi empregado para resolver o escoamento reativo. O combustível utilizado foi metano em mistura estequiométrica. Os resultados numéricos são confrontados com resultados experimentais, com o objetivo de examinar o estado da arte dessas metodologias. Valores transientes de pressão no interior do cilindro, vazão mássica de ar, fração mássica queimada, em relação ao eixo de manivelas e os produtos da combustão são confrontados A presença de recirculações na admissão e no cilindro foram detectadas e discutidas. As evoluções da pressão interna no cilindro e da vazão mássica de ar resultantes da simulação numérica apresentaram um bom comportamento, quando confrontado com dados experimentais. Os resultados da fração mássica de combustível queimado revelam características importantes de funcionamento do motor.

Since its inception, the internal combustion engine is the alternative of delivering power most used worldwide in passenger vehicles and transportation. Indeed, it is observed in day-to-day a strong dependency on the use of engines, and currently studies aiming at its increased efficiency and reduced emissions are becoming more intense. With the great advances in the availability of computers, there is a continuing trend towards the use of computational techniques aiding in the engine designs. However, the main challenge is to simulate the highly three-dimensional, transient and turbulent flows with the turbulence and combustion models, which have good compromise with the involved physics. In this context, this work aims to develop a validation of numerical and experimental methods for…

Advisors/Committee Members: Vielmo, Horacio Antonio.

Subjects/Keywords: Motor de combustão interna; Volumes finitos; Simulação numérica; Otto cycle; CFD; Moving mesh; Turbulence; Combustion; Experimental-numerical simulation

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

APA (6^th Edition):

Zancanaro Junior, F. V. (2014). Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos. (Doctoral Dissertation). Brazil. Retrieved from http://hdl.handle.net/10183/109158

Chicago Manual of Style (16^th Edition):

Zancanaro Junior, Flavio Vanderlei. “Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos.” 2014. Doctoral Dissertation, Brazil. Accessed April 16, 2021. http://hdl.handle.net/10183/109158.

MLA Handbook (7^th Edition):

Zancanaro Junior, Flavio Vanderlei. “Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos.” 2014. Web. 16 Apr 2021.

Vancouver:

Zancanaro Junior FV. Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos. [Internet] [Doctoral dissertation]. Brazil; 2014. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10183/109158.

Council of Science Editors:

Zancanaro Junior FV. Análise numérica e experimental da combustão de metano em motores de combustão interna alternativos. [Doctoral Dissertation]. Brazil; 2014. Available from: http://hdl.handle.net/10183/109158

14. Gauci, Éléonore. Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries.

Degree: Docteur es, Sciences pour l'ingénieur, 2018, Université Côte d'Azur (ComUE)

URL: http://www.theses.fr/2018AZUR4227

►

En ce qui concerne les problèmes de Dynamique des Fluides Numériques, l’adaptation du maillage est intéressante pour sa capacité à aborder la convergence asymptotique et… (more)

▼

En ce qui concerne les problèmes de Dynamique des Fluides Numériques, l’adaptation du maillage est intéressante pour sa capacité à aborder la convergence asymptotique et à obtenir une prévision précise pour des flux complexes à moindre coût. La méthode d’adaptation de maillage anisotrope réduit le nombre de degrés de liberté nécessaires pour atteindre la précision d’une solution donnée, ce qui a un impact positif sur le temps de calcul. De plus, il réduit la dissipation du schéma numérique en tenant compte automatiquement de l'anisotropie des phénomènes physiques à l'intérieur du maillage. Deux approches principales existent dans la littérature. L'adaptation du maillage basée sur les caractéristiques géométriques, qui est principalement déduite d'une estimation de l'erreur d'interpolation utilisant la hessienne du senseur choisi, contrôle l'erreur d'interpolation du capteur sur l'ensemble du domaine de calcul. Une telle approche est facile à mettre en place et a un large éventail d’applications, mais elle ne prend pas en compte l’EDP considérée utilisée pour résoudre le problème. D'autre part, l'adaptation de maillage orientée fonctionnelle, qui se concentre sur une fonctionnelle scalaire, prend en compte à la fois la solution et l'EDP dans l'estimation d'erreur grâce à l'état adjoint. Mais, la conception de cette estimation d'erreur est beaucoup plus compliquée. Cette thèse présente les résultats obtenus avec différentes méthodes de Dynamique des Fluides Numériques: les solveurs de flux arbitrairement lagrangiens-eulériens (ALE) avec schémas explicites et implicites sont présentés et couplés au mouvement de maillage, l’adaptation de maillage feature-based instationnaire pour les géométries mobiles prend en compte les changements des connectivités de maillage durant toute la simulation, l'état adjoint est étendu aux problèmes de géométries mobiles et l'adaptation de maillage instationnaire orientée fonctionnelle pour les maillages mobiles est déduite d'une estimation d'erreur a priori. Plusieurs exemples numériques issus du secteur aéronautique et du domaine de sécurité civile sont considérés.

When dealing with CFD problems, mesh adaptation is interesting for its ability to approach the asymptotic convergence and to obtain an accurate prediction for complex flows at a lower cost. Anisotropic mesh adaptation method reduces the number of degrees of freedom required to reach a given solution accuracy, thus impact favorably the CPU time. Moreover, it reduces the numerical scheme dissipation by automatically taking into account the anisotropy of the physical phenomena inside the mesh. Two main approaches exist in the literature. Feature-based mesh adaptation which is mainly deduced from an interpolation error estimate using the Hessian of the chosen sensor controls the interpolation error of the sensor over the whole computational domain. Such approach is easy to set-up and has a wide range of application, but it does not take into account the considered PDE used to solve the problem. On the other hand, goal-oriented…

Advisors/Committee Members: Alauzet, Frédéric (thesis director), Dervieux, Alain (thesis director).

Subjects/Keywords: Adaptation de maillage basée métrique; Anisotropie; Adjoint; Simulations instationnaires; Mouvement de maillage; ALE; Metric-based mesh adaptation; Anisotropy; Adjoint; Unsteady simulations; Moving mesh; ALE

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

APA (6^th Edition):

Gauci, E. (2018). Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries. (Doctoral Dissertation). Université Côte d'Azur (ComUE). Retrieved from http://www.theses.fr/2018AZUR4227

Chicago Manual of Style (16^th Edition):

Gauci, Éléonore. “Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries.” 2018. Doctoral Dissertation, Université Côte d'Azur (ComUE). Accessed April 16, 2021. http://www.theses.fr/2018AZUR4227.

MLA Handbook (7^th Edition):

Gauci, Éléonore. “Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries.” 2018. Web. 16 Apr 2021.

Vancouver:

Gauci E. Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries. [Internet] [Doctoral dissertation]. Université Côte d'Azur (ComUE); 2018. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2018AZUR4227.

Council of Science Editors:

Gauci E. Adaptation de maillage orientée fonctionnelle et basée sur une métrique pour des simulations aérodynamiques en géométrie variable : Goal-oriented metric-based mesh adaptation for unsteady CFD simulations involving moving geometries. [Doctoral Dissertation]. Université Côte d'Azur (ComUE); 2018. Available from: http://www.theses.fr/2018AZUR4227

15. Barral, Nicolas. Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile.

Degree: Docteur es, Mathématiques Appliquées, 2015, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2015PA066476

►

Les simulations dépendant du temps sont toujours un challenge dans l'industrie, notamment à cause des problèmes posés par les géométries mobiles en termes de CPU… (more)

▼

Les simulations dépendant du temps sont toujours un challenge dans l'industrie, notamment à cause des problèmes posés par les géométries mobiles en termes de CPU et de précision. Cette thèse présente des contributions à certains aspects des simulations en géométrie mobile. Un algorithme de bouger de maillage fondé sur une déformation de maillage sur un grand pas de temps et des changements de connectivité (swaps) est étudié. Une méthode d'élasticité et une méthode d'interpolation directe sont comparées en 3D, démontrant l'efficacité de l'algorithme. Cet algorithme est couplé à un solver ALE, dont les schémas et l'implémentation en 3D sont décrits en détail. Une interpolation linéaire est utilisée pou traiter les swaps. Des cas de validation montrent que les swaps n'influent pas notablement sur la précision de la solution. Plusieurs examples complexes en 3D démontrent la puissance de cette approche, pour des mouvement imposés ou pour des problèmes d'Interaction Fluide-Structure. L'adaptation de maillage anisotrope a démontré son efficacité pour améliorer la précision des calculs stationnaires pour un coût raisonnable. On considère l'extension de ces méthodes aux problèmes instationnaires, en mettant à jour l'algorithme de point fixe précédent grâce à une ananlyse de l'erreur espace-temps fondée sur le modèle de maillage continu. Une parallélisation efficace permet de réaliser des simulations adaptatives instationnaires avec une précision inégalée. Cet algorithme est étendu au cas des géométries mobiles en corrigeant la métrique optimale instationnaire. Finalement, plusieurs exemples 3D de simulations adaptatives en géométries mobiles démontrent l'efficacité de l'approche.

Time dependent simulations are still a challenge for industry, notably due to problems raised by moving boundaries, both in terms of CPU cost and accuracy. This thesis presents contributions to several aspects of simulations with moving meshes. A moving-mesh algorithm based on a large deformation time step and connectivity changes (swaps) is studied. An elasticity method and an Inverse Distance Weighted interpolation method are compared on many 3D examples, demonstrating the efficiency of the algorithm in handling large geometry displacement without remeshing. This algorithm is coupled with an Arbitrary-Lagrangian-Eulerian (ALE) solver, whose schemes and implementation in 3D are described in details. A linear interpolation scheme is used to handle swaps. Validation test cases showed that the use of swaps does not impact notably the accuracy of the solution, while several other complex 3D examples demonstrate the capabilities of the approach both with imposed motion and Fluid-Structure Interaction problems. Metric-based mesh adaptation has proved its efficiency in improving the accuracy of steady simulation at a reasonable cost. We consider the extension of these methods to unsteady problems, updating the previous fixed-point algorithm thanks to a new space-time error analysis based on the continuous mesh model. An efficient p-thread…

Advisors/Committee Members: Alauzet, Frédéric (thesis director).

Subjects/Keywords: CFD: Mécanique des Fluides Numérique; Simulations instationnaires; Maillages mobiles; ALE: Arbitrtary Lagrangian Eulerian; FSI: Interaction Fluides Structures; Adaptation de maillage; Unsteady mesh adaptation; Moving mesh; 510

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

APA (6^th Edition):

Barral, N. (2015). Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2015PA066476

Chicago Manual of Style (16^th Edition):

Barral, Nicolas. “Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile.” 2015. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed April 16, 2021. http://www.theses.fr/2015PA066476.

MLA Handbook (7^th Edition):

Barral, Nicolas. “Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile.” 2015. Web. 16 Apr 2021.

Vancouver:

Barral N. Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2015. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2015PA066476.

Council of Science Editors:

Barral N. Time-accurate anisotropic mesh adaptation for three-dimensional moving mesh problems : Adaptation de maillage anisotrope dépendant du temps pour des problèmes tridimensionnels en maillage mobile. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2015. Available from: http://www.theses.fr/2015PA066476

16. Dos Santos, Fabien. Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation.

Degree: Docteur es, Mécanique et énergétique, 2012, Université de Bourgogne

URL: http://www.theses.fr/2012DIJOS079

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Le travail de cette thèse a pour but de fournir et valider des outils permettant d'étudier et de comprendre les phénomènes mis en jeu lors… (more)

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Le travail de cette thèse a pour but de fournir et valider des outils permettant d'étudier et de comprendre les phénomènes mis en jeu lors de l'injection d'un carburant dans un moteur à combustion interne, principalement axé sur l'écoulement intra-injecteur. Ces outils sont numériques et permettent de simuler la formation d'un spray. Une première partie est axée sur la modélisation 0D. Les modèles permettant de prédire des caractéristiques de spray comme son angle, sa pénétration ou encore la longueur du corps liquide, sont comparés à des données expérimentales. Les conclusions sont que la modélisation 0D permet d'obtenir de bons résultats. Par contre une meilleure connaissance de l'influence de la cavitation sur le spray, qui passe par la compréhension de l'écoulement intra-injecteur, pourrait être bénéfique pour la prédiction de ces modèles. Une seconde étude sur l'écoulement intra-injecteur est alors menée en utilisant un modèle à équation barotrope. Une validation de celui-ci est effectuée de façon à vérifier qu'il est capable de prédire correctement l'écoulement dans un injecteur. Le modèle offre de bons résultats et peut être utilisé pour l'étude suivante. Enfin, dans la dernière partie, le modèle de cavitation qui a été validé est utilisé. Une géométrie d'injecteur mono-trou est utilisée avec des pressions comparables à celles utilisées actuellement en automobile. L'étude consiste à étudier l'influence de plusieurs paramètres géométriques sur l'apparition de la cavitation. Le mouvement de l'aiguille est aussi étudié et est comparé, après avoir offert au code la possibilité de maillage mobile, à des résultats in-stationnaires pour plusieurs levées d'aiguille.

The work of this thesis aims to provide and validate tools useful to study and understand the phenomena involved in the injection of fuel, mainly focused on intra-flow injector. These tools are numeric and simulate the formation of a spray. A first part focuses on zero-dimensional modelling. Models which predict these following characteristics of spray like the spray angle, the spray penetration or the liquid length are compared with experimental data. The conclusions are that zero-dimensional modelling provides good results very quickly in some cases. Although, a better understanding of the influence of cavitation on the spray, which requires an understanding of the intra-flow injector, could be beneficial for the prediction of these models. A second study is carried out to select a model of multi-dimensional cavitation. The chosen model is a barotropic equation model. A validation of this model is then performed to ensure that it is able to predict the cavitating flow inside a nozzle. The model provides good results and can be used for the next step. Finally, in the third part, the cavitation model previously validated is used. Single-hole nozzle geometry is used with an injection pressure comparable to that used in internal combustion engines with direct injection system. The study is done to investigate the influence of several geometrical…

Advisors/Committee Members: Le Moyne, Luis (thesis director).

Subjects/Keywords: Modélisation; Energétique; Injection; Spray; MFN/CFD; Cavitation; Intra-injecteur; Atomisation; Maillage mobile; OpenFOAM; 0D modelling; 3D modelling; Cavitation; Intra-injector; Moving mesh; 515; 532; 620.1

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APA (6^th Edition):

Dos Santos, F. (2012). Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation. (Doctoral Dissertation). Université de Bourgogne. Retrieved from http://www.theses.fr/2012DIJOS079

Chicago Manual of Style (16^th Edition):

Dos Santos, Fabien. “Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation.” 2012. Doctoral Dissertation, Université de Bourgogne. Accessed April 16, 2021. http://www.theses.fr/2012DIJOS079.

MLA Handbook (7^th Edition):

Dos Santos, Fabien. “Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation.” 2012. Web. 16 Apr 2021.

Vancouver:

Dos Santos F. Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation. [Internet] [Doctoral dissertation]. Université de Bourgogne; 2012. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2012DIJOS079.

Council of Science Editors:

Dos Santos F. Contribution à l'étude de la formation des sprays : Contribution to the study of spray formation. [Doctoral Dissertation]. Université de Bourgogne; 2012. Available from: http://www.theses.fr/2012DIJOS079

Vrije Universiteit Amsterdam

17. Vargas Rivera, M. Blowup in two geometric flows .

Degree: 2011, Vrije Universiteit Amsterdam

URL: http://hdl.handle.net/1871/24161

Subjects/Keywords: wiskunde; mathematics; blowup; geometric flows; moving mesh methods; matched asymptotics; comparison principle

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

APA (6^th Edition):

Vargas Rivera, M. (2011). Blowup in two geometric flows . (Doctoral Dissertation). Vrije Universiteit Amsterdam. Retrieved from http://hdl.handle.net/1871/24161

Chicago Manual of Style (16^th Edition):

Vargas Rivera, M. “Blowup in two geometric flows .” 2011. Doctoral Dissertation, Vrije Universiteit Amsterdam. Accessed April 16, 2021. http://hdl.handle.net/1871/24161.

MLA Handbook (7^th Edition):

Vargas Rivera, M. “Blowup in two geometric flows .” 2011. Web. 16 Apr 2021.

Vancouver:

Vargas Rivera M. Blowup in two geometric flows . [Internet] [Doctoral dissertation]. Vrije Universiteit Amsterdam; 2011. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1871/24161.

Council of Science Editors:

Vargas Rivera M. Blowup in two geometric flows . [Doctoral Dissertation]. Vrije Universiteit Amsterdam; 2011. Available from: http://hdl.handle.net/1871/24161

18. Fayez Moustafa Moawad, Ragab. Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method .

Degree: 2016, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/65353

► [EN] The neutron diffusion equation is an approximation of the neutron transport equation that describes the neutron population in a nuclear reactor core. In particular,… (more)

▼ [EN] The neutron diffusion equation is an approximation of the neutron transport equation that describes the neutron population in a nuclear reactor core. In particular, we will consider here VVER-type reactors which use the neutron diffusion equation discretized on hexagonal meshes. Most of the simulation codes of a nuclear power reactor use the multigroup neutron diffusion equation to describe the neutron distribution inside the reactor core.To study the stationary state of a reactor, the reactor criticality is forced in artificial way leading to a generalized differential eigenvalue problem, known as the Lambda modes equation, which is solved to obtain the dominant eigenvalues of the reactor and their corresponding eigenfunctions. To discretize this model a finite element method with h-p adaptivity is used. This method allows to use heterogeneous meshes, and allows different refinements such as the use of h-adaptive meshes, reducing the size of specific cells, and p-refinement, increasing the polynomial degree of the basic functions used in the expansions of the solution in the different cells. Once the solution for the steady state neutron distribution is obtained, it is used as initial condition for the time integration of the neutron diffusion equation. To simulate the behaviour of a nuclear power reactor it is necessary to be able to integrate the time-dependent neutron diffusion equation inside the reactor core. The spatial discretization of this equation is done using a finite element method that permits h-p refinements for different geometries. Transients involving the movement of the control rod banks have the problem known as the rod-cusping effect. Previous studies have usually approached the problem using a fixed mesh scheme defining averaged material properties and many techniques exist for the treatment of the rod cusping problem. The present work proposes the use of a moving mesh scheme that uses spatial meshes that change with the movement of the control rods avoiding the necessity of using equivalent material cross sections for the partially inserted cells. The performance of the moving mesh scheme is tested studying different benchmark problems. For reactor calculations, the accuracy of a diffusion theory solution is limited for for complex fuel assemblies or fine mesh calculations. To improve these results a method that incorporates higher-order approximations for the angular dependence, as the simplified spherical harmonics (SPN ) method must be employed. In this work an h-p Finite Element Method (FEM) is used to obtain the dominant Lambda mode associated with a configuration of a reactor core using the SPN approximation. The performance of the SPN (N= 1, 3, 5) approximations has been tested for different reactor benchmarks.; [ES] La ecuación de la difusión neutrónica es una aproximación de la ecuación del transporte de neutrones que describe la población de neutrones en el núcleo de un reactor nuclear. En particular, consideraremos reactores de tipo VVER y para simular su comportamiento se… Advisors/Committee Members: Ginestar Peiro, Damián (advisor), Verdú Martín, Gumersindo Jesús (advisor).

Subjects/Keywords: Lambda Modes; H-p-adaptability; Eigenvalue problems; Rod-cusping problem; Moving mesh scheme; Neitron diffusion equation; Finite Element Method; Neutron SPN equations; Spherical harmonics

12 more images…

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

APA (6^th Edition):

Fayez Moustafa Moawad, R. (2016). Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/65353

Chicago Manual of Style (16^th Edition):

Fayez Moustafa Moawad, Ragab. “Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method .” 2016. Doctoral Dissertation, Universitat Politècnica de València. Accessed April 16, 2021. http://hdl.handle.net/10251/65353.

MLA Handbook (7^th Edition):

Fayez Moustafa Moawad, Ragab. “Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method .” 2016. Web. 16 Apr 2021.

Vancouver:

Fayez Moustafa Moawad R. Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10251/65353.

Council of Science Editors:

Fayez Moustafa Moawad R. Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method . [Doctoral Dissertation]. Universitat Politècnica de València; 2016. Available from: http://hdl.handle.net/10251/65353

19. Nouveau, Léo. Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage.

Degree: Docteur es, Mathématiques appliquées et calcul scientifique, 2016, Bordeaux

URL: http://www.theses.fr/2016BORD0410

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La prédiction de mouvement de solide évoluant dans un fluide présente un réel intérêt pour des applications industrielles telle que l’accrétion de glace sur des… (more)

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La prédiction de mouvement de solide évoluant dans un fluide présente un réel intérêt pour des applications industrielles telle que l’accrétion de glace sur des surfaces aérodynamiques. Dans ce contexte, en considérant des systèmes de dégivrage, la prévision des trajectoire de glace est nécessaire pour éviter des risques de collision/ingestion de glace sur/dans des zones sensibles de l’avion. Ce type d’application soulève de nombreux challenges d’un point de vue numérique, en particulier concernant la génération/l’adaptation de maillage au cours du mouvement du solide dans le domaine. Pour gérer ces difficultés, dans cette étude, les solides sont définis de manière implicite via une fonction level set. Une méthode de type frontière immergée, appelée Pénalization, est utilisée pour imposer les conditions de bords. Pour améliorer la précision de l’interface, les équations sont résolues sur des maillages non structurés adaptatifs. Cela permet d’obtenir un raffinement proche des bords du solide et ainsi d’améliorer sa définition, permettant un meilleure impositions des conditions de bord. Pour économiser du temps de calcul, et éviter de coûteuses étapes de remaillage/interpolation, la stratégie adoptée pour les simulations instationnaires est d’utiliser une adaptation de maillage à connectivité constante, aussi appelée r-adaptation.

The prediction of solid motion evolving in a fluid presents a real interest for engineering application such as ice accretion on aerodynamics bodies.In this context, considering de-icing systems, the ice shedding trajectory is needed to prevent the risk of collision/ingestion of the ice in/with some sensitive part of the aircraft. This application raises many challenges from a numerical point of view, especially concerning mesh generation/adaptation as the solid moves in the computational domain. To handle this issue, in this work the solids are known implicitly on the mesh via a level set function. An immersed boundary method, called penalization, is employed to impose the wall boundary conditions. To improve the resolution of these boundaries, the equations are solved on adaptive unstructured grids. This allows to have are finement close to the solid boundary and thus increases the solid definition,leading to a more accurate imposition of the wall conditions. To save computational time, and avoid costly remeshing/interpolation steps, the strategy chosen for unsteady simulations is to use a constant connectivity mesh adaptation,also known as r-adaptation

Advisors/Committee Members: Ricchiuto, Mario (thesis director), Beaugendre, Héloïse (thesis director), Dobrzynski, Cécile (thesis director).

Subjects/Keywords: Pénalization; Objets mobiles; Interaction fluide structure; Schémas aux résidus distribués; Adaptation de maillage; Penalization; Moving bodies; Fluid structure interaction; Residual distribution schemes; Mesh adaptation

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

APA (6^th Edition):

Nouveau, L. (2016). Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2016BORD0410

Chicago Manual of Style (16^th Edition):

Nouveau, Léo. “Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage.” 2016. Doctoral Dissertation, Bordeaux. Accessed April 16, 2021. http://www.theses.fr/2016BORD0410.

MLA Handbook (7^th Edition):

Nouveau, Léo. “Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage.” 2016. Web. 16 Apr 2021.

Vancouver:

Nouveau L. Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage. [Internet] [Doctoral dissertation]. Bordeaux; 2016. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2016BORD0410.

Council of Science Editors:

Nouveau L. Adaptive residual based schemes for solving the penalized Navier Stokes equations with moving bodies : application to ice shedding trajectories : Schémas aux résidus distribués adaptatifs pour résoudre les équations de Navier Stokes pénalisées avec objets mobiles : applications aux trajectoires de glace dans le cadre du givrage. [Doctoral Dissertation]. Bordeaux; 2016. Available from: http://www.theses.fr/2016BORD0410

20. Lunardi, Rodrigo Vinicius. Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável.

Degree: 2019, Brazil

URL: http://biblioteca.ufabc.edu.br/index.php?codigo_sophia=118611

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Orientador: Prof. Dr. André Fenili

Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Mecânica, Santo André, 2019.

Os estudos dos fenômenos… (more)

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Orientador: Prof. Dr. André Fenili

Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Mecânica, Santo André, 2019.

Os estudos dos fenômenos de interação fluido-estrutura são importantes, pois ajudam a evitar grandes desastres em sistemas estruturais de engenharia. Para o estudo dessas interações modelos matemáticos são desenvolvidos e numericamente simulados por meio de códigos computacionais Neste trabalho é desenvolvido um código computacional para investigar escoamento bidimensional de um fluido newtoniano e incompressível em torno de um corpo retangular confinado entre placas planas paralelas. Para o código é feita a discretização das equações de Navier-Stokes pelo método dos volumes finitos, utilizando o desacoplamento velocidade-pressão. Para resolver a pressão utilizou-se o método iterativo Sucessive Over-Relaxation. Para a simulação são desenvolvidas duas malhas: uma malha fixa uniforme e estruturada; e uma malha móvel adaptável. Serão comparados ambos os métodos de malha com a finalidade de validar o método de malha móvel adaptável para diferentes números de Reynolds. Como resultado, obteve-se um código que utiliza malhas móveis adaptáveis e opera com números de Reynolds entre dez e cinquenta. Concluiu-se que o método de malha móvel adaptável diminui o erro da simulação sem alterar o número de volumes finitos ou a função de interpolação. O método de malha móvel adaptável, no entanto, é dependente da malha inicial.

Studying fluid-structure interaction is important for it helps avoiding disasters in structural systems in engineering. To study those interactions, mathematical models are developed and simulated numerically by computer algorithms. In this work, an algorithm to investigate an incompressible Newtonian fluid two-dimensional flow around a rectangular body between parallel flat plates is developed. For the code, the discretization of the Navier-Stokes equations using the finite volume method is made, using velocity-pressure decoupling. To solve the pressure, the interactive method Successive Over-Relaxation is used. Two meshes are developed for the simulation: an uniform and structured fixed mesh; and an adaptive moving mesh. Both mesh methods will be compared to validate the adaptive moving mesh method for different Reynolds numbers. As a result, a code that uses adaptive moving mesh and operates with Reynolds numbers between ten and fifty was obtained. The conclusion was that the adaptive moving mesh method reduced the simulation error without changing the number of finite volumes or the interpolating function. The adaptive moving mesh method is dependent on the initial mesh, however.

Advisors/Committee Members: Fenili, André, Hetem Junior, Annibal, Mello, Paulo Eduardo Batista de.

Subjects/Keywords: DINÂMICA DE FLUIDOS COMPUTACIONAL; SIMULAÇÃO DE ESCOAMENTO; SIMULAÇÃO NUMÉRICA; MALHA MÓVEL ADAPTÁVEL; COMPUTATIONAL FLUID DYNAMICS; FLOW SIMULATION; NUMERICAL SIMULATIONS; ADAPTIVE MOVING MESH; PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA MECÂNICA - UFABC

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

APA (6^th Edition):

Lunardi, R. V. (2019). Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável. (Masters Thesis). Brazil. Retrieved from http://biblioteca.ufabc.edu.br/index.php?codigo_sophia=118611

Chicago Manual of Style (16^th Edition):

Lunardi, Rodrigo Vinicius. “Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável.” 2019. Masters Thesis, Brazil. Accessed April 16, 2021. http://biblioteca.ufabc.edu.br/index.php?codigo_sophia=118611.

MLA Handbook (7^th Edition):

Lunardi, Rodrigo Vinicius. “Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável.” 2019. Web. 16 Apr 2021.

Vancouver:

Lunardi RV. Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável. [Internet] [Masters thesis]. Brazil; 2019. [cited 2021 Apr 16]. Available from: http://biblioteca.ufabc.edu.br/index.php?codigo_sophia=118611.

Council of Science Editors:

Lunardi RV. Desenvolvimento de um código para simular o escoamento bidimensional em torno de um corpo retangular com malha adaptável. [Masters Thesis]. Brazil; 2019. Available from: http://biblioteca.ufabc.edu.br/index.php?codigo_sophia=118611

21. Sy, Birame. Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery.

Degree: Docteur es, Génie énergétique (AM), 2020, Paris, HESAM

URL: http://www.theses.fr/2020HESAE045

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A l’ère du numérique, le cycle de développement d’un produit se fait dans sa quasi totalité sur ordinateur. Il n’est plus nécessaire de produire physiquement… (more)

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A l’ère du numérique, le cycle de développement d’un produit se fait dans sa quasi totalité sur ordinateur. Il n’est plus nécessaire de produire physiquement des versions préliminaires. Leurs caractéristiques peuvent être testées avec une précision dépendante de la maturité des méthodes de simulation. Les acteurs de la recherche en simulation numérique ont donc pour défi de transposer leurs récentes avancées vers l’industrie. En mécanique des fluides, les codes de calcul doivent gagner en adaptabilité afin de prendre en compte la morphologie du problème et du maillage. Le paramétrage des méthodes avancées doit pouvoir être délégué par l’utilisateur non-expert à la machine. Ce travail de recherche porte sur l’adaptabilité en espace d’un schéma volumes finis d’ordre élevé (FV-MLS). L’ordre élevé est un élément indispensable afin de capter les phénomènes fortement instationnaires.Pour augmenter l’ordre de précision, le schéma FV-MLS fait intervenir une reconstruction polynomiale d’ordre élevé par Moindres Carrés Mobiles. MLS affiche un fort potentiel en terme de flexibilité pour traiter des géométries complexes. Elle possède par ailleurs un nombre important de paramètres pouvant être intégrés dans un procédé d’optimisation. Ces travaux ont tout d’abord apporté des réponses concernant la sensibilité de la méthode vis-à-vis des paramètres MLS. À un second niveau, une série d’algorithmes de choix pertinent de ces paramètres a été mise au point, tout en améliorant nettement la robustesse, la précision et l’efficacité de calcul. La charge de l’utilisateur a ainsi été réduite de manière conséquente, lui permettant de se recentrer sur son cœur de métier. Cette méthodologie a été validée jusqu’à l’ordre 6. Pour améliorer la robustesse au schéma numérique vis-à-vis de l’anisotropie du maillage, un nouveau cadre de reconstruction locale d’ordre élevée a été défini.Cette reconstruction locale permet de réduire drastiquement les effets de l’anisotropie. Plusieurs cas de validation et exemples d’applications ont été réalisé afin de démonter l’intérêt des méthodes proposées.

In the digital age, almost all of a product’s development cycle is done on a computer. There is no longer a need to physically produce drafts. Their characteristics can be tested with precision that depends on the maturity of the simulation methods. Researchers in digital simulation therefore have the challenge of transferring their recent advances to industry. In fluid mechanics, the computer codes must gain in adaptability in order to take into account the morphology of the problem and the mesh.The configuration of advanced methods should be delegated by the non-expert user to the machine.This research work focused on the adaptability in space of a high order finite volume scheme (FV-MLS). The high order is an essential element in order to capture highly unsteady phenomena. To increase the order of precision, the FV-MLS scheme involves a high order polynomial reconstruction by Least Mobile Squares. MLS has great potential in terms of flexibility for handling…

Advisors/Committee Members: Khelladi, Sofiane (thesis director), Deligant, Michaël (thesis director).

Subjects/Keywords: Ordres élevés; Volumes finis; Adaptabilité; Turbomachine; Aérodynamique; Aéroacoustique; Maillage glissant; CFD; CAA; High order; Finite volume; Turbomachinery; Aerodynamics; Aeroacoustic; MLS; Moving least Square; Stencil; Adaptive; Sliding-mesh; 621.042

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

APA (6^th Edition):

Sy, B. (2020). Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery. (Doctoral Dissertation). Paris, HESAM. Retrieved from http://www.theses.fr/2020HESAE045

Chicago Manual of Style (16^th Edition):

Sy, Birame. “Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery.” 2020. Doctoral Dissertation, Paris, HESAM. Accessed April 16, 2021. http://www.theses.fr/2020HESAE045.

MLA Handbook (7^th Edition):

Sy, Birame. “Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery.” 2020. Web. 16 Apr 2021.

Vancouver:

Sy B. Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery. [Internet] [Doctoral dissertation]. Paris, HESAM; 2020. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2020HESAE045.

Council of Science Editors:

Sy B. Adaptabilité en espace d'un schéma volumes finis d'ordre élevé pour la CFD/CAA des turbomachines : Spatial adaptibility of a high order finite volumes scheme for CFD/CAA in turbomachinery. [Doctoral Dissertation]. Paris, HESAM; 2020. Available from: http://www.theses.fr/2020HESAE045

22. Linn, Renato Vaz. Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos.

Degree: 2017, Brazil

URL: http://hdl.handle.net/10183/163257

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Neste trabalho, é apresentada a simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis rígidos ou deformáveis empregando-se técnicas adaptativas. As simulações numéricas são… (more)

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Neste trabalho, é apresentada a simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis rígidos ou deformáveis empregando-se técnicas adaptativas. As simulações numéricas são conduzidas utilizando-se o método dos elementos finitos. A discretização espaço-temporal é desenvolvida através do método das linhas ou direções características (Characteristic-Based Split - CBS) e a modelagem da turbulência é feita através de um modelo de Simulação de Grandes Escalas (SGE, ou na terminologia em inglês, Large Eddy Simulation – LES) com o coeficiente de Smagorinsky variável no tempo e espaço (SGE ou LES dinâmico). A análise estrutural de corpos deformáveis imersos no fluido é realizada através de um modelo de elementos finitos triangulares para análise de placas e cascas com não linearidade geométrica, usando materiais elásticos com comportamento linear. Conjuntamente, um método de adaptação anisotrópica transiente de malhas é empregado para obter resultados com boa resolução a baixos custos computacionais. A consideração do movimento relativo de corpos imersos no escoamento é feita através de um método híbrido de movimento da malha que emprega interpolação com funções de base radial. Exemplos bidimensionais e tridimensionais são apresentados de forma a validar cada uma das metodologias desenvolvidas. Por fim, exemplos de simulações complexas são investigados, comparando-se os resultados obtidos com resultados experimentais e numéricos presentes na literatura.

In this work, the simulation of compressible turbulent flows around rigid and flexible moving bodies is presented using adaptative techniques. The numerical simulations are solved employing the finite element method. The space-time discretization is performed using the Characteristic-Based Split scheme (CBS) and turbulence is modelled with Large Eddy Simulation (LES) and a dynamic Smagorinsky sub-grid model. The structural analysis of deformable bodies immersed on the flow is performed using a triangular finite element model for the analysis of geometrically non-linear elastic plates and shells. An anisotropic mesh adaptation algorithm for transient simulations is coupled with the solver to achieve results with good resolution and low computational costs. The consideration of the relative movement of immersed bodies on the flow is performed employing an hybrid method of mesh movement based on radial basis function interpolation. Twodimensional and three-dimensional examples are presented in order to validate the proposed methodologies. Finally, complex simulations are investigated, where results are compared with experimental and numerical data available in the literature.

Advisors/Committee Members: Awruch, Armando Miguel.

Subjects/Keywords: Escoamento turbulento; Escoamento compressível; Dinâmica dos fluidos computacional; Elementos finitos; Simulação numérica; Computational fluid dynamics; Compressible turbulence; LES; Anisotropic mesh adaptation; Moving bodies; Aero-elasticity

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

APA (6^th Edition):

Linn, R. V. (2017). Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos. (Doctoral Dissertation). Brazil. Retrieved from http://hdl.handle.net/10183/163257

Chicago Manual of Style (16^th Edition):

Linn, Renato Vaz. “Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos.” 2017. Doctoral Dissertation, Brazil. Accessed April 16, 2021. http://hdl.handle.net/10183/163257.

MLA Handbook (7^th Edition):

Linn, Renato Vaz. “Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos.” 2017. Web. 16 Apr 2021.

Vancouver:

Linn RV. Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos. [Internet] [Doctoral dissertation]. Brazil; 2017. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10183/163257.

Council of Science Editors:

Linn RV. Simulação de escoamentos compressíveis turbulentos no entorno de corpos móveis usando malhas adaptativas de elementos finitos. [Doctoral Dissertation]. Brazil; 2017. Available from: http://hdl.handle.net/10183/163257

23. WANG XIAOYONG. A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems.

Degree: 2008, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/13225

Subjects/Keywords: Incompressible Navier-Stokes; Moving body; Moving boundary; Mesh free method; 3D; Generalized finite difference

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APA (6^th Edition):

XIAOYONG, W. (2008). A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/13225

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):

XIAOYONG, WANG. “A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems.” 2008. Thesis, National University of Singapore. Accessed April 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/13225.

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

MLA Handbook (7^th Edition):

XIAOYONG, WANG. “A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems.” 2008. Web. 16 Apr 2021.

Vancouver:

XIAOYONG W. A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Apr 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/13225.

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

Council of Science Editors:

XIAOYONG W. A SVD-GFD Method to simulate 3D Moving Boundary Flow Problems. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/13225

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

24. WU YANLING. Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows.

Degree: 2012, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/36137

Subjects/Keywords: Local Domain Free Discretization; Immersed Boundary Method; Cartesian mesh method; non-conforming-mesh method; complex geometries; moving bodies

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APA (6^th Edition):

YANLING, W. (2012). Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/36137

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):

YANLING, WU. “Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows.” 2012. Thesis, National University of Singapore. Accessed April 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/36137.

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

MLA Handbook (7^th Edition):

YANLING, WU. “Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows.” 2012. Web. 16 Apr 2021.

Vancouver:

YANLING W. Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows. [Internet] [Thesis]. National University of Singapore; 2012. [cited 2021 Apr 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/36137.

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

Council of Science Editors:

YANLING W. Local Domain-Free Discretization Method and Its Combination with Immersed Boundary Method for Simulation of Fluid Flows. [Thesis]. National University of Singapore; 2012. Available from: http://scholarbank.nus.edu.sg/handle/10635/36137

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

25. Morgoch, Dana. Simulating the Blade-Water Interactions of the Sprint Canoe Stroke.

Degree: MASc, 2016, McMaster University

URL: http://hdl.handle.net/11375/19895

►

As a sprint canoe athlete takes a stroke, the flow around their blade governs the transfer of power from the athlete to the water. Gaining… (more)

Subjects/Keywords: Sprint Canoe; Canoe Sprint; Canoe Blade; Canoe Stroke; CFD; Moving Mesh; Blade Hydrodynamics; Blade Water Interaction

…front [◦ ] Γdisp : Mesh stiffness δ: Deflection [m] δdistance : Deflection… …distance due to shaft flexibility [m] δmesh : Mesh node displacement [m] ix… …Mesh Motion . . . . . . . . . . . . . . . . . . . . . . . 30 3.3 Fluid Modelling (… …Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.6 Free… …about the geometry and mesh used for blade motion method validation…

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

APA (6^th Edition):

Morgoch, D. (2016). Simulating the Blade-Water Interactions of the Sprint Canoe Stroke. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/19895

Chicago Manual of Style (16^th Edition):

Morgoch, Dana. “Simulating the Blade-Water Interactions of the Sprint Canoe Stroke.” 2016. Masters Thesis, McMaster University. Accessed April 16, 2021. http://hdl.handle.net/11375/19895.

MLA Handbook (7^th Edition):

Morgoch, Dana. “Simulating the Blade-Water Interactions of the Sprint Canoe Stroke.” 2016. Web. 16 Apr 2021.

Vancouver:

Morgoch D. Simulating the Blade-Water Interactions of the Sprint Canoe Stroke. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/11375/19895.

Council of Science Editors:

Morgoch D. Simulating the Blade-Water Interactions of the Sprint Canoe Stroke. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/19895

26. Yang, Jiadi. Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map.

Degree: Computer Science, 2015, UCLA

URL: http://www.escholarship.org/uc/item/05n4w76r

► We propose a robust multi-modal method for automatically registering a moving camera (e.g. mounted on a robot) in 3D scene map. Our approach takes advantages… (more)

Subjects/Keywords: Computer science; camera registration; mesh warping; motion estimation; moving camera; video stabilization

…Introduction Accurately registering a moving sensor in 3D scene map is capable of providing scene… …frame from the video sequence captured by a moving camera. Figure. 1.1 (b) plots the… …our method is to stabilize input videos captured by a moving camera, e.g. being mounted on a… …this work, we propose a stabilization algorithm based on spatial pyramid mesh warping, which… …trajectory 1 Fitted Trajectory (a) (b) Figure 1.1: Registering moving…

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APA (6^th Edition):

Yang, J. (2015). Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/05n4w76r

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):

Yang, Jiadi. “Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map.” 2015. Thesis, UCLA. Accessed April 16, 2021. http://www.escholarship.org/uc/item/05n4w76r.

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

MLA Handbook (7^th Edition):

Yang, Jiadi. “Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map.” 2015. Web. 16 Apr 2021.

Vancouver:

Yang J. Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map. [Internet] [Thesis]. UCLA; 2015. [cited 2021 Apr 16]. Available from: http://www.escholarship.org/uc/item/05n4w76r.

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

Council of Science Editors:

Yang J. Dense Spatial Pyramid Mesh Warping for Registering Moving Cameras in 3D Scene Map. [Thesis]. UCLA; 2015. Available from: http://www.escholarship.org/uc/item/05n4w76r

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

27. Wang, Luming. Discontinuous Galerkin Methods on Moving Domains with Large Deformations.

Degree: Mathematics, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/84j5b9j8

► We present two different numerical approaches for solving compressible flows on moving domains with high-order accuracy. The approaches are base on discontinuous Galerkin (DG) methods… (more)

Subjects/Keywords: Applied mathematics; ALE; compressible Navier-Stokes; Discontinuous Galerkin; mesh; Moving Domain; space-time

…69 69 70 71 72 73 75 vii List of Algorithms 3.1 4.1 4.2 5.1 Moving-Mesh Startegy… …large deformation. Our ideas both originate from a novel moving mesh strategy, which is able… …to handle arbitrary geometric motions efficiently and robustly. This moving mesh strategy… …ALE framework. First, based on the moving mesh strategy, we present a space-time… …previous work outlined above, our procedures improve the spatial meshes by the moving-mesh…

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

APA (6^th Edition):

Wang, L. (2015). Discontinuous Galerkin Methods on Moving Domains with Large Deformations. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/84j5b9j8

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):

Wang, Luming. “Discontinuous Galerkin Methods on Moving Domains with Large Deformations.” 2015. Thesis, University of California – Berkeley. Accessed April 16, 2021. http://www.escholarship.org/uc/item/84j5b9j8.

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

MLA Handbook (7^th Edition):

Wang, Luming. “Discontinuous Galerkin Methods on Moving Domains with Large Deformations.” 2015. Web. 16 Apr 2021.

Vancouver:

Wang L. Discontinuous Galerkin Methods on Moving Domains with Large Deformations. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Apr 16]. Available from: http://www.escholarship.org/uc/item/84j5b9j8.

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

Council of Science Editors:

Wang L. Discontinuous Galerkin Methods on Moving Domains with Large Deformations. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/84j5b9j8

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

28. Chen, Yuhao. Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems.

Degree: MS, Mechanical Engineering, 2017, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1492428866626613

► This thesis introduces a new computational framework relying on a non-iterative mesh generation algorithm for modeling moving boundary transient diffusion problems. In particular, we focus… (more)

Subjects/Keywords: Mechanical Engineering; non-iterative mesh generation algorithm; modeling moving boundary transient diffusion problems

…elements. . . . . . . . . . . . . . . 17 (a) Deformed mesh created after moving the… …of the mesh structure to conform to the moving boundary [34, 77]. Varying robust… …conforming mesh at each time step for simulating moving boundary problems using such methods, which… …can be employed to evolve the conforming FE mesh during the simulations a moving boundary… …undergoing large deformations [55]. Other automatic mesh moving techniques, often…

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APA (6^th Edition):

Chen, Y. (2017). Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1492428866626613

Chicago Manual of Style (16^th Edition):

Chen, Yuhao. “Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems.” 2017. Masters Thesis, The Ohio State University. Accessed April 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492428866626613.

MLA Handbook (7^th Edition):

Chen, Yuhao. “Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems.” 2017. Web. 16 Apr 2021.

Vancouver:

Chen Y. Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems. [Internet] [Masters thesis]. The Ohio State University; 2017. [cited 2021 Apr 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1492428866626613.

Council of Science Editors:

Chen Y. Conforming to interface structured adaptive mesh refinement technique for modeling moving boundary problems. [Masters Thesis]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1492428866626613

29. Zancanaro Junior, Flavio Vanderlei. Simulação numérica do escoamento turbulento em motores de combustão interna.

Degree: 2010, Brazil

URL: http://hdl.handle.net/10183/25046

►

Com os grandes avanços ocorridos na disponibilização de computadores, existe uma tendência contínua para a utilização de técnicas computacionais auxiliando no projeto de equipamentos de… (more)

▼

Com os grandes avanços ocorridos na disponibilização de computadores, existe uma tendência contínua para a utilização de técnicas computacionais auxiliando no projeto de equipamentos de engenharia. Cada vez mais estão se obtendo resultados bastante próximos às condições reais, incluindo a simulação de motores de combustão interna. Neste sentido o presente trabalho tem o objetivo de analisar o escoamento turbulento no processo de admissão de ar em um motor operando em ciclo Diesel. A investigação é focada na determinação da influência do passo de tempo no cálculo do coeficiente de descarga e razão de swirl. Adicionalmente, o campo de velocidades, pressão, energia cinética turbulenta e outros parâmetros são apresentados e analisados, com o objetivo de auxiliar no entendimento da dinâmica envolvida. Essencialmente, dois modelos de turbulência são empregados, juntamente com dois tratamentos de parede. Seus resultados também são confrontados e discutidos. A geometria considerada é de um motor Fiat 1.9 L quatro tempos com duas válvulas. A análise é concentrada em um único cilindro. O pacote computacional utilizado é o Star-cd, e seu aplicativo es-ice. A independência de malha foi obtida, chegando a 1.672.056 volumes. Os resultados são apresentados de duas formas. A primeira delas refere-se a resultados de simulações em regime permanente, realizadas em boa parte por outros autores, com ênfase na determinação do coeficiente de descarga e razão de swirl, estes confrontados com valores experimentais, visando à validação da metodologia. Fica evidente a importância da escolha do modelo de turbulência na simulação de motores de combustão interna, assim como das funções de interpolação utilizadas. Na segunda parte os resultados referem-se a uma análise transiente, considerando o movimento do pistão e válvulas, a 1500 RPM. Observa-se a grande exigência quanto ao passo de tempo requerido no transiente real, ficando demonstrado que para esta velocidade o menor passo de tempo utilizado, 0,05° (5.5555E-6 s), ainda é insuficiente para alguns momentos do ciclo. É possível notar maior influência no coeficiente de descarga do que na razão de swirl, em relação aos passos de tempo utilizados. A forte dependência do modelo de turbulência nos resultados obtidos é mais uma vez confirmada, conforme o esperado, já que as hipóteses sobre a física do fenômeno são diferentes em cada modelo. Os resultados quanto ao tratamento na parede não apresentaram significantes diferenças, quando aplicados junto ao modelo de turbulência k-ω SST.

Considering the increase in the availability of computers, there is a continuing trend toward the use of computational simulation aiding in the design of engineering equipments. Reasonable results, close to the real conditions, are obtained, including the simulation of internal combustion engines. In this way, the present work has the objective of analyzing the turbulent flow in the air intake process of an engine operating in Diesel cycle. The investigation focuses on the determination of the time step in the…

Advisors/Committee Members: Vielmo, Horacio Antonio.

Subjects/Keywords: Motor de combustão interna; Escoamento turbulento; Simulação numérica; Diesel engine; CFD; Moving mesh; Turbulence model; Time step

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

APA (6^th Edition):

Zancanaro Junior, F. V. (2010). Simulação numérica do escoamento turbulento em motores de combustão interna. (Masters Thesis). Brazil. Retrieved from http://hdl.handle.net/10183/25046

Chicago Manual of Style (16^th Edition):

Zancanaro Junior, Flavio Vanderlei. “Simulação numérica do escoamento turbulento em motores de combustão interna.” 2010. Masters Thesis, Brazil. Accessed April 16, 2021. http://hdl.handle.net/10183/25046.

MLA Handbook (7^th Edition):

Zancanaro Junior, Flavio Vanderlei. “Simulação numérica do escoamento turbulento em motores de combustão interna.” 2010. Web. 16 Apr 2021.

Vancouver:

Zancanaro Junior FV. Simulação numérica do escoamento turbulento em motores de combustão interna. [Internet] [Masters thesis]. Brazil; 2010. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10183/25046.

Council of Science Editors:

Zancanaro Junior FV. Simulação numérica do escoamento turbulento em motores de combustão interna. [Masters Thesis]. Brazil; 2010. Available from: http://hdl.handle.net/10183/25046

University of Manchester

30. Kant, Pallav. Spreading of micro-droplets on patterned surfaces.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313207

► In this thesis, we use a combination of experiments and numerical modelling to study the spreading of micro-droplets on â€˜patterned surfacesâ€™, with applications to the… (more)

▼ In this thesis, we use a combination of experiments and numerical modelling to study the spreading of micro-droplets on â€˜patterned surfacesâ€™, with applications to the manufacture of POLED displays via inkjet printing. The term patterned surfaces is used to refer to surfaces with either micron-sized topographical features or variations in the wettability or a combination of both. We demonstrate that these patterned surfaces provide an effective means to control the spread of fluid deposited using an inkjet method so that liquid films are printed in a pixel shape. It is shown that the spreading of the fluid deposited via the inkjet method can be either locally enhanced or hindered depending on whether the topography gradient ahead of the contact line is positive or negative. Locally enhanced spreading occurs via the formation of thin rivulets through a mechanism similar to the capillary rise in sharp corners. A key feature of the liquid-substrate interaction studied in this work is the presence of significant contact angle hysteresis, which enables the persistence of non-circular fluid morphologies. However, we find that the efficacy of topographical features in restraining the spreading of deposited liquid within the boundaries of a pixel is critically dependent on the accurate positioning of droplets in a pixel. We demonstrate that this dependence on the positioning of droplets is reduced on substrates with both topographical and wettability patterns. Excellent predictions of the evolution of the liquid morphologies on patterned surfaces are provided by a simple model combining quasi-static surface-tension effects within the framework of a thin-film approximation, combined with an experimentally measured dynamic spreading law, which relates the speed of the contact line to the contact angle. We also show that if an experimental spreading law is not available, the spreading of a droplet in a pixel can be adequately predicted by the Cox-Voinov spreading law. This model does not include viscous effects in the bulk of a droplet and hence a given morphology is attained more rapidly in the numerical computations compared to the experiments in which bulk viscous resistance retards the fluid motion. Nonetheless, the model can be used very effectively to predict the areas covered by the liquid and may serve as a useful design tool in the inkjet printing industry. Advisors/Committee Members: HAZEL, ANDREW A, Juel, Anne, Hazel, Andrew.

Subjects/Keywords: Wetting; Spreading on patterned surfaces; spreading; spreading on topography; topography controlled spreading; spreading on wettability patterns; patterned surfaces; micro-droplets spreading; inkjet printing; inkjet printing based manufacturing; inkjet printing of display devices; pixel printing on display devices; Drop on demand inkjet printing; Cox-Voinov spreading; oomph-lib; Finite element method; Moving boundary problem; curvature driven flow; moving mesh; photo-lithography; lithography; advancing contact line; receding contact line; moving contact line; sequential deposition of multiple droplets; printing of liquid line; primary bulge formation in a liquid line; non-uniform liquid morphologies; spreading in a corner; formation of thin rivulets

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

APA (6^th Edition):

Kant, P. (2018). Spreading of micro-droplets on patterned surfaces. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313207

Chicago Manual of Style (16^th Edition):

Kant, Pallav. “Spreading of micro-droplets on patterned surfaces.” 2018. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313207.

MLA Handbook (7^th Edition):

Kant, Pallav. “Spreading of micro-droplets on patterned surfaces.” 2018. Web. 16 Apr 2021.

Vancouver:

Kant P. Spreading of micro-droplets on patterned surfaces. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Apr 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313207.

Council of Science Editors:

Kant P. Spreading of micro-droplets on patterned surfaces. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313207

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