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Rice University
1.
Sun, John.
Lattice Boltzmann Simulations of Blunt and Pointed Geometries.
Degree: MS, Engineering, 2019, Rice University
URL: http://hdl.handle.net/1911/107701 
► This bio-inspired research will focus on using the lattice Boltzmann method (LBM) to calculate the drag of rigid geometries that resemble a sailfish bill inside…
(more)
▼ This bio-inspired research will focus on using the
lattice Boltzmann method (LBM) to calculate the drag of rigid geometries that resemble a sailfish bill inside a channel with low fluid speed and high viscosity. These 2D simulation results will compare the performance of these similar structures, each with the same area but slightly different shapes, thus shedding light on the aerodynamic properties of the sailfish-bill-like structures in viscous fluids. The LBM model will be established using the open source code on Palabos in C/C++ to create the simulation channel and the obstacle, as well as to capture the fluid behavior on a mesoscopic scale and convert mesoscopic variables to macroscopic ones for data visualization and comparison purposes.
Advisors/Committee Members: Schaefer, Laura A (advisor).
Subjects/Keywords: Lattice Boltzmann Method; CFD
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APA (6th Edition):
Sun, J. (2019). Lattice Boltzmann Simulations of Blunt and Pointed Geometries. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/107701
Chicago Manual of Style (16th Edition):
Sun, John. “Lattice Boltzmann Simulations of Blunt and Pointed Geometries.” 2019. Masters Thesis, Rice University. Accessed February 25, 2021.
http://hdl.handle.net/1911/107701.
MLA Handbook (7th Edition):
Sun, John. “Lattice Boltzmann Simulations of Blunt and Pointed Geometries.” 2019. Web. 25 Feb 2021.
Vancouver:
Sun J. Lattice Boltzmann Simulations of Blunt and Pointed Geometries. [Internet] [Masters thesis]. Rice University; 2019. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/1911/107701.
Council of Science Editors:
Sun J. Lattice Boltzmann Simulations of Blunt and Pointed Geometries. [Masters Thesis]. Rice University; 2019. Available from: http://hdl.handle.net/1911/107701
2.
Grissa, Kods.
Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires.
Degree: Docteur es, Energétique, thermique, combustion, 2018, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; École nationale d'Ingénieurs de Monastir (Tunisie)
URL: http://www.theses.fr/2018ESMA0012
► En raison de la tendance positives pour le développement durable, les systèmes solaires(capteurs solaires, concentrateur solaire, etc.) Intègrent (et demandent d'intégrer encore plus)intensivement les résidences…
(more)
▼ En raison de la tendance positives pour le développement durable, les systèmes solaires(capteurs solaires, concentrateur solaire, etc.) Intègrent (et demandent d'intégrer encore plus)intensivement les résidences et les industries. Dans ce contexte, les systèmes diphasiques comme le caloduc semblent être très efficaces en raison de leurs capacités élevées de transport de chaleur et de leur fonctionnement passif appliqués aux capteurs. Compte-tenu de la complexité des caloducs à structure poreuse dans ce type d'application, la plupart des systèmes existants sur le marché utilisent des thermosiphons. Ainsi, le besoin croissant de solutions de contrôle thermique fiables et plus efficaces croit rapidement pour de tels systèmes.Ce travail de thèse porte sur la caractérisation des performances des caloducs à structure poreuse utilisés dans les applications solaires. Une étude numérique a été réalisée pour modéliser et simuler le comportement d'un caloduc typique à l'aide de la méthode Lattice Boltzmann. Une étude expérimentale a également été réalisée pour caractériser les performances de trois prototypes testes dans différentes conditions (température du condenseur, puissance introduite et angle d'inclinaison). Les effets induits par plusieurs paramètres incluant le taux de remplissage, le fluide de travail et la symétrie de la puissance appliquée sur les performances de ces dispositifs ont également été étudiés. En particulier, l'asymétrie du chauffage induit un assèchement plus précoce, toutes choses étant égales par ailleurs. L'inclinaison optimale est également déterminée là où est équilibrée la chaleur solaire maximale disponible et reçue par le caloduc et l'écoulement de liquide assisté par gravité à l'intérieur de ce dispositif.
Owing to the trend to development sustainability, solar systems (solar collector, solar concentrator, etc.) Are integrating (and asked to integrate even more) intensively residences and industries. In this context, two-phase systems like heat pipe seem highly effective because of their high heat transport capabilities and their passive operation in collectors’ technology. In view of the complexity of the heat pipes with a porous structure in this kind of application,most of the existing systems on the market use thermosyphons. Thus, the growing need of reliable and more efficient thermal control solutions is increasing for such systems. This thesis work focuses on the performance characterization of heat pipes with porous structure used in solar applications. A numerical study has been performed to model and simulate the behavior of a typical heat pipe using the Lattice Boltzmann method. An experimental study has also been done to characterize the performance of three prototypes tested under different conditions (condenser temperature, heat input and inclination angle). The effects induced by several parameters including the filling rate, working fluid and symmetry of the applied heat on the performance of these devices has also been investigated. In particular, heating asymmetry is found…
Advisors/Committee Members: Bertin, Yves (thesis director), Benselama, Adel Mustafa (thesis director), Jemni, Abdelmajid (thesis director).
Subjects/Keywords: Méthode de Lattice-Boltzmann; Thermosiphon; Lattice-Boltzmann method; Thermosiphon
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APA (6th Edition):
Grissa, K. (2018). Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; École nationale d'Ingénieurs de Monastir (Tunisie). Retrieved from http://www.theses.fr/2018ESMA0012
Chicago Manual of Style (16th Edition):
Grissa, Kods. “Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires.” 2018. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; École nationale d'Ingénieurs de Monastir (Tunisie). Accessed February 25, 2021.
http://www.theses.fr/2018ESMA0012.
MLA Handbook (7th Edition):
Grissa, Kods. “Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires.” 2018. Web. 25 Feb 2021.
Vancouver:
Grissa K. Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; École nationale d'Ingénieurs de Monastir (Tunisie); 2018. [cited 2021 Feb 25].
Available from: http://www.theses.fr/2018ESMA0012.
Council of Science Editors:
Grissa K. Numerical and Experimental Study of Heat Pipes Used in Solar Applications : Étude numérique, par la méthode de Boltzmann sur réseau, et expérimentale des caloducs utilisés dans les applications solaires. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; École nationale d'Ingénieurs de Monastir (Tunisie); 2018. Available from: http://www.theses.fr/2018ESMA0012
Delft University of Technology
3.
Gunasekaran, Sandeep (author).
Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e16a8d87-2bd7-402b-a03d-3f756b16f524
► For the past fifty years, there has been a constant increase in the pressure ratio of gas turbines motivated by the need to increase the…
(more)
▼ For the past fifty years, there has been a constant increase in the pressure ratio of gas turbines motivated by the need to increase the cycle efficiency. This has moved the operating pressure of gas turbine combustor to be above the critical pressure of jet fuels. This increasing trend in pressure of combustor, places the next generation gas turbines in supercritical regime of majority of jet fuels, making Supercritical Combustion a significant topic of research in the field of gas turbine. Understanding the fluid behavior at and above the critical point provides opportunity for better and efficient combustor design. The complexity in numerical modelling of supercritical fluids, due to the dramatic property variations, solubility in gas and difficulty in tracking the vanishing interface, requires alternate modelling techniques that are well suited for treating multi-phase systems efficiently.
Lattice Boltzmann Methods(LBM) is one such system gaining popularity in the recent decade due to the inherent capability to model complex multi-phase flows. LBM is a hybrid particle-continuum
method based on the kinetic theory, which entails solution of the
Boltzmann equation for the distribution function of particles properties on a
lattice node. Despite the advantages of LBM, there is considerable gap in effective application of this
method as a solution for engineering problems. This research work is aimed to address this issue by creating a single and multi-component solver using LBM and making quantitative comparison with commercial fluid dynamic flow solver, ANSYS FLUENT. The results form created single-phase LBM solver agrees with the results from FLUENT single-phase solution in addition to showing superiority in terms of computational time and resources. In case of the multi-component model, LBM provided accurate results with coarser mesh refinement. A detailed investigation of LBM application for two simple systems has been studied and reported,bthus laying a foundation for future numerical investigation of supercritical fluid modelling.
Advisors/Committee Members: Lettieri, Claudio (mentor), Colonna di Paliano, Piero (graduation committee), Dwight, Richard (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: transcritical; lattice boltzmann method; distribution function
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APA (6th Edition):
Gunasekaran, S. (. (2017). Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e16a8d87-2bd7-402b-a03d-3f756b16f524
Chicago Manual of Style (16th Edition):
Gunasekaran, Sandeep (author). “Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method.” 2017. Masters Thesis, Delft University of Technology. Accessed February 25, 2021.
http://resolver.tudelft.nl/uuid:e16a8d87-2bd7-402b-a03d-3f756b16f524.
MLA Handbook (7th Edition):
Gunasekaran, Sandeep (author). “Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method.” 2017. Web. 25 Feb 2021.
Vancouver:
Gunasekaran S(. Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Feb 25].
Available from: http://resolver.tudelft.nl/uuid:e16a8d87-2bd7-402b-a03d-3f756b16f524.
Council of Science Editors:
Gunasekaran S(. Numerical modelling of transcritical fluid behaviour using Lattice Boltzmann method. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:e16a8d87-2bd7-402b-a03d-3f756b16f524
Queens University
4.
Bespalko, Dustin John.
Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
.
Degree: Mechanical and Materials Engineering, 2011, Queens University
URL: http://hdl.handle.net/1974/6729
► In this work, the lattice Boltzmann method (LBM) was validated for direct numerical simulation (DNS) of wall-bounded turbulent flows. The LBM is a discrete-particle-based method…
(more)
▼ In this work, the lattice Boltzmann method (LBM) was validated for direct numerical simulation (DNS) of wall-bounded turbulent flows. The LBM is a discrete-particle-based method that numerically solves the Boltzmann equation as opposed to conventional DNS methods that are based on the Navier-Stokes (NS) equations. The advantages of the LBM are its simple implementation, its ability to handle complex geometries, and its scalability on modern high-performance computers.
An LBM code was developed and used to simulate fully-developed turbulent channel flow. In order to validate the results, the turbulence statistics were compared to those calculated from a conventional NS-based finite difference (FD) simulation. In the present study, special care was taken to make sure the computational domains for LBM and FD simulations were the same. Similar validation studies in the literature have used LBM simulations with smaller computational domains in order to reduce the computational cost. However, reducing the size of the computational domain affects the turbulence statistics and confounds the results of the validation.
The turbulence statistics calculated from the LBM and FD simulations were found to agree qualitatively; however, there were several significant deviations, particularly in the variance profiles. The largest discrepancy was in the variance of the pressure fluctuations, which differed by approximately 7%. Given that both the LBM and FD simulations resolved the full range of turbulent scales and no models were used, this error was deemed to be significant.
The cause of the discrepancy in the pressure variance was found to be the compressibility of the LBM. The LBM allows the density to vary, while the FD method does not since it solves the incompressible form of the NS equations. The effect of the compressibility could be reduced by lowering the Mach number, but this would come at the cost of significantly increasing the computational cost. Therefore, the conclusion of this work is that, while the LBM is capable of producing accurate solutions for incompressible turbulent flows, it is significantly more expensive than conventional methods for simple wall-bounded turbulent flows.
Subjects/Keywords: Lattice Boltzmann Method
;
Direct Numerical Simulation
;
Turbulence
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APA ·
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Export
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APA (6th Edition):
Bespalko, D. J. (2011). Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6729
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bespalko, Dustin John. “Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
.” 2011. Thesis, Queens University. Accessed February 25, 2021.
http://hdl.handle.net/1974/6729.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bespalko, Dustin John. “Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
.” 2011. Web. 25 Feb 2021.
Vancouver:
Bespalko DJ. Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
. [Internet] [Thesis]. Queens University; 2011. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/1974/6729.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bespalko DJ. Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
. [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6729
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Khurana, Siddhant (author).
Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:9ae314db-b6f1-4294-a661-041b2c26114c
► Over the past decades, numerous methods have been used to study acoustic liners through their impedance, of which numerical methods are of particular interest. Despite…
(more)
▼ Over the past decades, numerous methods have been used to study acoustic liners through their impedance, of which numerical methods are of particular interest. Despite their advantages, numerical methods are bounded by certain drawbacks. One such drawback stems from the need to accurately discretize the liner geometry, which can lead to large simulation wall-clock time. Another limitation is caused by the absence of a stable and robust impedance boundary condition to account for the liner effects. With such limitations, there is a need to develop new methodologies which can effectively mimic the effects of an acoustic liner. A possible approach could be to model them as equivalent fluids. Thus, the primary objective of this project is to investigate the efficacy of the equivalent fluid approach to reproduce the liner effects. To satisfy this objective, the Acoustic Porous Medium (APM), which is an equivalent fluid formulation available in the flow-solver PowerFLOW® is employed in the current thesis. For reproducing the liner effects with an APM, two different methodologies are explored. In the first approach, the APM model parameters are derived through an inverse algorithm which uses a priori known impedance as an input and gives the corresponding model parameters as an output. In the second approach, the APM parameters are derived through the pressure drop values, measured across the liner facesheet under a steady laminar flow. With both these approaches, APM faces some limitations when compared with the reference results. The shortcoming is primarily cause by the inability of the APM formulation to correctly account for the mass reactance effects of the reference liner. Moreover, the results have also raised doubts over the use of the APM formulation for low input porosity values. Thus, some improvements are required in the current implementation of APM to improve its efficacy for reproducing the acoustic effects of liner used in this thesis.
Aerospace Engineering
Advisors/Committee Members: Avallone, F. (mentor), Casalino, D. (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Aeroacoustics; CFD; lattice boltzmann method; Honeycomb liner
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APA (6th Edition):
Khurana, S. (. (2020). Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9ae314db-b6f1-4294-a661-041b2c26114c
Chicago Manual of Style (16th Edition):
Khurana, Siddhant (author). “Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation.” 2020. Masters Thesis, Delft University of Technology. Accessed February 25, 2021.
http://resolver.tudelft.nl/uuid:9ae314db-b6f1-4294-a661-041b2c26114c.
MLA Handbook (7th Edition):
Khurana, Siddhant (author). “Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation.” 2020. Web. 25 Feb 2021.
Vancouver:
Khurana S(. Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Feb 25].
Available from: http://resolver.tudelft.nl/uuid:9ae314db-b6f1-4294-a661-041b2c26114c.
Council of Science Editors:
Khurana S(. Equivalent Fluid Modelling of a Honeycomb Acoustic Liner using the Acoustic Porous Medium Formulation. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:9ae314db-b6f1-4294-a661-041b2c26114c
NSYSU
6.
Lee, Kuan-Wei.
Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026114-184704
► The aim of this paper is to present a 2-D computational model of particle-laden flows over staggered fibers at a Reynolds number of 1 by…
(more)
▼ The aim of this paper is to present a 2-D computational model of particle-laden flows over staggered fibers at a Reynolds number of 1 by using a
Lattice Boltzmann method. The trajectory of particle motion are described by Lagrangian tracking
method with a combination of drag, gravity, Saffman lift force, Brownian forces acting on the particles. This study investigated the effect of packing density and fiber geometry in particle size from 7 nm to 500 nm, the range includes main particle collection mechanisms: Brownian diffusion, interception and inertial impaction. The packing density of fiber ranges from 5.6% to 19.63%. Present results show the correlation between fiber arrangements and particle collection. The fiber geometry adopted in the study includes cylinder, diamond and square. It is found out that among the geometries studied, fibers with diamond shape have higher particle capture efficiency in the interception mechanism dominated cases. We also simulate the particle loading on a single fiber and two attached fibers using a
Lattice Boltzmann cellular automata
method in Brownian diffusion dominated cases. The simulation results present the patterns of particle deposition and the dendrite structure on fiber surface.
Advisors/Committee Members: Chih-Neng Hsu (chair), Chien-Chou Tseng (chair), Kuang C. Lin (committee member), Sheng-Lun Lin (chair).
Subjects/Keywords: Particle loading; Lattice Boltzmann cell automation method; Particle capture efficiency; Lattice Boltzmann Method; Staggered fibers
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APA ·
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APA (6th Edition):
Lee, K. (2014). Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026114-184704
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lee, Kuan-Wei. “Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method.” 2014. Thesis, NSYSU. Accessed February 25, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026114-184704.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lee, Kuan-Wei. “Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method.” 2014. Web. 25 Feb 2021.
Vancouver:
Lee K. Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Feb 25].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026114-184704.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lee K. Effects of staggered fiber arrangement on aerosol particle transport and deposition in obstructed laminar flows using lattice Boltzmann method. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026114-184704
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
7.
Noah, Khalid.
Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/15560
► Computational fluid dynamics (CFD) encompasses a variety of numerical methods. Some depend on macroscopic model representatives, which are solved by finite volume, finite element or…
(more)
▼ Computational fluid dynamics (CFD) encompasses a variety of numerical methods. Some depend on macroscopic model representatives, which are solved by finite volume, finite element or finite difference method, while others rely on a microscopic description. The lattice Boltzmann method (LBM) is considered a mesoscopic particle method, with its scale lying between macroscopic and microscopic. LBM works well when solving incompressible flow problems, but limitations arise when solving compressible flows, particularly at high Mach numbers. In the present research, this limitation will be overcome by using higher-order Taylor series expansion of the Maxwell equilibrium distribution function and Kataoka and Tsutahara (KT) models for compressible flows. The multiple relaxation times (MRT) approach associated with the collision term of the lattice Boltzmann equation (LBE) will be adopted to enhance the numerical stability of the code, while the large eddy simulation (LES) scale model will be implemented in LBM to simulate compressible jet flows at high subsonic speeds pertinent to jet noise problems. Three-dimensional simulation is performed using 19- and 15-lattice velocity with D3Q19 and D3Q15 models, respectively. In addition, compressible LBM is applied to simulate both heated and unheated jets to show the ability of the nonadiabatic fifth-order equilibrium distribution function in solving nonadiabatic compressible flows. The near-field flow physics and noise simulations are performed using a compressible lattice Boltzmann method. The results from the LMB simulation are used in the Kirchhoff surface integral approach to predict far-field jet noise. Finally, because of the ability of lattice Boltzmann in parallel computing and to improve the computation efficiency of LBM on the numerical simulations of turbulent flows, compute unified device architecture (CUDA) is used to implement LBM in the graphics processing unit (GPU), creating the hybrid code LBM-MRT-LES by utilizing the Kirchhoff integral method, a powerful tool for simulating aeroacoustics problems.
Subjects/Keywords: compressible lattice Boltzmann method, jet noise, large eddy simulation; Lattice Boltzmann methods; Computational fluid dynamics
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APA (6th Edition):
Noah, K. (2020). Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15560
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Noah, Khalid. “Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method.” 2020. Thesis, University of Waterloo. Accessed February 25, 2021.
http://hdl.handle.net/10012/15560.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Noah, Khalid. “Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method.” 2020. Web. 25 Feb 2021.
Vancouver:
Noah K. Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/10012/15560.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Noah K. Numerical Prediction of Jet Noise Using Compressible Lattice Boltzmann Method. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15560
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Bechereau, Marie.
Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio.
Degree: Docteur es, Mathématiques appliquées, 2016, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2016SACLN059
► Les extensions bifluides des méthodes Lattice Boltzmann à frontière libre utilisent généralement des pseudopotentiels microscopiques pour modéliser l'interface. Nous avons choisi d'orienter nos recherches vers…
(more)
▼ Les extensions bifluides des méthodes Lattice Boltzmann à frontière libre utilisent généralement des pseudopotentiels microscopiques pour modéliser l'interface. Nous avons choisi d'orienter nos recherches vers une méthode Lattice Boltzmann à capture d'interface où la fraction massique d'un des deux fluides, inconnue, est transportée. De nombreux travaux ont montré les difficultés des méthodes Lattice Boltzmann à traiter des systèmes bifluides, et ce d'autant plus que le ratio de densité est important. Nous expliquerons l'origine de ces problèmes en mettant en évidence le manque de diffusion numérique pour capturer précisément les discontinuités de contact. Pour régler cet obstacle, nous proposerons une formulation Arbitrary Lagrangian Eulerian (ALE) des méthodes Lattice Boltzmann. Cela permet de séparer le traitement des ondes matérielles de celui des ondes de pression. Une fois l'étape ALE terminée, une phase de projection ramène les variables sur la grille eulérienne de calcul initiale. Nous expliquons comment obtenir une procédure de projection ayant une précision d'ordre 2 et une interface fine et dépourvue d'oscillations. Il sera montré que la fraction massique satisfait un principe du maximum discret et qu'elle reste donc entre 0 et 1. Les simulations numériques sont en accord avec la théorie. Même si notre méthode n'est pour le moment utilisée que pour simuler des écoulements de fluides non visqueux (Equations d'Euler), nous sommes convaincus qu'elle pourra être étendue à des simulations d'écoulements bifluides visqueux.
Two-fluid extensions of Lattice Boltzmann methods with free boundaries usually consider ``microscopic'' pseudopotential interface models. In this paper, we rather propose an interface-capturing Lattice Boltzmann approach where the mass fraction variable is considered as an unknown and is advected. Several works have reported the difficulties of LBM methods to deal with such two-fluid systems especially for high-density ratio configurations. This is due to the mixing nature of LBM, as with Flux vector splitting approaches for Finite Volume methods. We here give another explanation of the lack of numerical diffusion of Lattice Boltzmann approaches to accurately capture contact discontinuities. To fix the problem, we propose an arbitrary Lagrangian-Eulerian (ALE) formulation of Lattice-Boltzmann methods. In the Lagrangian limit, it allows for a proper separated treatment of pressure waves and advection phenomenon. After the ALE solution, a remapping (advection) procedure is necessary to project the variables onto the Eulerian Lattice-Boltzmann grid.We explain how to derive this remapping procedure in order to get second-order accuracy and achieve sharp stable oscillation-free interfaces. It has been shown that mass fractions variables satisfy a local discrete maximum principle and thus stay in the range [0,1]. The theory is supported by numerical computations of rising bubbles (without taking into account surface tension at this current state of development).Even if our methods are currently…
Advisors/Committee Members: Vuyst, Florian de (thesis director).
Subjects/Keywords: Méthode de Lattice Boltzmann; Écoulements multiphasiques; Méthodes lagrangiennes; Lattice Boltzmann Method; Multiphase flow; Lagrangian viewpoint
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APA (6th Edition):
Bechereau, M. (2016). Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLN059
Chicago Manual of Style (16th Edition):
Bechereau, Marie. “Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed February 25, 2021.
http://www.theses.fr/2016SACLN059.
MLA Handbook (7th Edition):
Bechereau, Marie. “Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio.” 2016. Web. 25 Feb 2021.
Vancouver:
Bechereau M. Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Feb 25].
Available from: http://www.theses.fr/2016SACLN059.
Council of Science Editors:
Bechereau M. Élaboration de méthodes Lattice Boltzmann pour les écoulements bifluides à ratio de densité arbitraire : Elaboration of Lattice Boltzmann methods for two-fluid flow with possibly high-density ratio. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLN059
9.
Cheylan, Isabelle.
Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications.
Degree: Docteur es, Sciences pour l'ingénieur. Mécanique et physique des fluides, 2019, Aix Marseille Université
URL: http://www.theses.fr/2019AIXM0119
► Cette thèse a pour objectif le développement d’un solveur adjoint dans ProLB, le logiciel d’aérodynamique basé sur la méthode de Lattice-Boltzmann utilisé chez Renault. Ce…
(more)
▼ Cette thèse a pour objectif le développement d’un solveur adjoint dans ProLB, le logiciel d’aérodynamique basé sur la méthode de Lattice-Boltzmann utilisé chez Renault. Ce solveur adjoint permet de calculer les sensibilités surfaciques des efforts aérodynamiques sur un obstacle, typiquement un véhicule, par rapport à la forme de celui-ci. L’objectif final est de le déformer, par des techniques de morphing basées sur une méthode de descente du gradient à pas constant, afin de réduire sa traînée aérodynamique. Dans un premier temps, l’étude de cas 2D laminaires permet de détailler le développement du solveur adjoint étape par étape. Le choix de la formulation de la force de traînée est un point important. Une étude a montré qu’il est plus judicieux de calculer cette force dans le sillage de l’objet plutôt que sur l’objet lui-même. L’objectif étant de minimiser la force de traînée moyenne, il a été montré que le meilleur compromis entre l’effort de calcul et la précision des gradients est obtenu en moyennant en temps le champ direct instationnaire. Dans un second temps, l’étude de cas 3D turbulents à grandes échelles a permis de montrer que les algorithmes fonctionnant sur des cas 2D laminaires ne sont pas suffisamment stables pour être utilisés dans ce contexte beaucoup plus complexe. Des modifications ont donc été apportées au solveur adjoint afin de pouvoir l’utiliser dans un contexte industriel. Il permet d’obtenir une cartographie des sensibilités sur tout le véhicule dans un écoulement à Reynolds élevé. Une boucle d’optimisation complète a été réalisée, avec une étape de lissage des sensibilités, et a permis de réduire la force de traînée de 5
This work aims at developing an adjoint solver in ProLB, the aerodynamic software based on the Lattice-Boltzmann method used by Renault. The adjoint solver makes it possible to calculate the surface sensitivities of the aerodynamic forces acting on an obstacle, such as a vehicle, with respect to its shape. The final purpose is to deform it, using morphing techniques based on a fixed step gradient descent method, in order to reduce its drag. First, the step by step development process of the adjoint solver is shown through 2D laminar test cases. The choice of the drag force expression is important because it has an impact on the complexity of the adjoint equations and on the gradient calculation. It is shown that calculating the drag force in the wake of the obstacle is more adequate than calculating it on the obstacle directly. The aim being to minimize the time-averaged drag force, it is demonstrated that the best trade-off between the gradients accuracy and the computation cost is obtained by time-averaging the unsteady direct field. Then, the study of 3D large-scale turbulent cases shows that the algorithms used for the 2D laminar cases are not stable enough to be used in this more complicated context. Changes have therefore been brought to the adjoint solver, in order to use it in an industrial context. Every assumption used for the development of the adjoint solver…
Advisors/Committee Members: Sagaut, Pierre (thesis director), Fritz, Guillaume (thesis director).
Subjects/Keywords: Optimisation de forme; Méthode adjointe; Lattice-Boltzmann; Aérodynamique; Shape optimization; Adjoint method; Lattice-Boltzmann; Aerodynamics
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APA ·
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APA (6th Edition):
Cheylan, I. (2019). Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2019AIXM0119
Chicago Manual of Style (16th Edition):
Cheylan, Isabelle. “Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications.” 2019. Doctoral Dissertation, Aix Marseille Université. Accessed February 25, 2021.
http://www.theses.fr/2019AIXM0119.
MLA Handbook (7th Edition):
Cheylan, Isabelle. “Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications.” 2019. Web. 25 Feb 2021.
Vancouver:
Cheylan I. Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications. [Internet] [Doctoral dissertation]. Aix Marseille Université 2019. [cited 2021 Feb 25].
Available from: http://www.theses.fr/2019AIXM0119.
Council of Science Editors:
Cheylan I. Optimisation de forme avec la méthode adjointe appliquée aux équations de Lattice-Boltzmann en aérodynamique : Shape optimization using the adjoint Lattice-Boltzmann method for aerodynamic applications. [Doctoral Dissertation]. Aix Marseille Université 2019. Available from: http://www.theses.fr/2019AIXM0119
Texas A&M University
10.
Kang, Shin Kyu.
Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.
Degree: PhD, Nuclear Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710
► In this dissertation, we explore direct-forcing immersed boundary methods (IBM) under the framework of the lattice Boltzmann method (LBM), which is called the direct-forcing immersed…
(more)
▼ In this dissertation, we explore direct-forcing immersed boundary methods (IBM) under the framework of the
lattice Boltzmann method (LBM), which is called the direct-forcing immersed boundary-
lattice Boltzmann method (IB-LBM).
First, we derive the direct-forcing formula based on the split-forcing
lattice Boltzmann equation, which recovers the Navier-Stokes equation with second-order accuracy and enables us to develop a simple and accurate formula due to its kinetic nature. Then, we assess the various interface schemes under the derived direct-forcing formula. We consider not only diffuse interface schemes but also a sharp interface scheme. All tested schemes show a second-order overall accuracy. In the simulation of stationary complex boundary flows, we can observe that the sharper the interface scheme is, the more accurate the results are.
The interface schemes are also applied to moving boundary problems. The sharp interface scheme shows better accuracy than the diffuse interface schemes but generates spurious oscillation in the boundary forcing terms due to the discontinuous change of nodes for the interpolation. In contrast, the diffuse interface schemes show smooth change in the boundary forcing terms but less accurate results because of discrete delta functions. Hence, the diffuse interface scheme with a corrected radius can be adopted to obtain both accurate and smooth results.
Finally, a direct-forcing immersed boundary
method (IBM) for the thermal
lattice Boltzmann method (TLBM) is proposed to simulate non-isothermal flows. The direct-forcing IBM formulas for thermal equations are derived based on two TLBM models: a double-population model with a simplified thermal
lattice Boltzmann equation (Model 1) and a hybrid model with an advection-diffusion equation of temperature (Model 2). The proposed methods are validated through natural convection problems with stationary and moving boundaries. In terms of accuracy, the results obtained from the IBMs based on both models are comparable and show a good agreement with those from other numerical methods. In contrast, the IBM based on Model 2 is more numerically efficient than the IBM based on Model 1.
Overall, this study serves to establish the feasibility of the direct-forcing IB-LBM as a viable tool for computing various complex and/or moving boundary flow problems.
Advisors/Committee Members: Hassan, Yassin A. (advisor), Annamalai, Kalyan (committee member), Chen, Hamn-Ching (committee member), Marlow, William H. (committee member).
Subjects/Keywords: Direct-forcing immersed boundary method; Lattice Boltzmann Method; Complex moving boundary
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APA ·
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APA (6th Edition):
Kang, S. K. (2012). Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710
Chicago Manual of Style (16th Edition):
Kang, Shin Kyu. “Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 25, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710.
MLA Handbook (7th Edition):
Kang, Shin Kyu. “Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.” 2012. Web. 25 Feb 2021.
Vancouver:
Kang SK. Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710.
Council of Science Editors:
Kang SK. Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710
University of Sydney
11.
Moon, Jiyoung.
Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
.
Degree: 2017, University of Sydney
URL: http://hdl.handle.net/2123/17106
► Predicting the rheological properties of particles in matrix is one of the most challenging and complicated problems in material and fluid sciences. The complication is…
(more)
▼ Predicting the rheological properties of particles in matrix is one of the most challenging and complicated problems in material and fluid sciences. The complication is arisen by the particles collision and interactions with the surrounding fluid. A full description of the rheology of particles requires a complete understanding of the interactions between particles, interaction between the particles and the matrix fluid, and interactions between channel and particles. Thus consideration of above factors can lead to a better understanding of the rheological behavior of suspensions with particles flow. In this thesis, fluid with deformable particle and fluid with rigid particles are considered. A combination model of the three dimensional lattice Boltzmann method (LBM) and the immersed boundary method (IBM) are used to simulate these suspension systems. For the single particle deformation in the flow, the boundary thickness and value on transit time in a microchannel was analyzed. To see the physics behind the single particle in a micro channel, the path selection (navigation) of a single moving particle in a microfluidic channel network was analyzed. To see the interaction between wall property and suspension flow, deformable particles in hydrophobic and hydrophilic surface microfluidic channels was analyzed. To see the effect of particle roughness on rheology, the results of measuring the viscometric flow of concentrated rigid-sphere suspensions with constant-viscosity matrices, both Newtonian (silicone oil) and non-Newtonian were presented. Finally, the rough particle was analyzed by lattice Boltzmann method to find the physics behind the experimental results.
Subjects/Keywords: Rheology;
Lattice Boltzmann method;
Immersed boundary method;
Suspension;
Rough particle;
Microfluidics
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APA ·
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CSE |
Export
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APA (6th Edition):
Moon, J. (2017). Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/17106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moon, Jiyoung. “Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
.” 2017. Thesis, University of Sydney. Accessed February 25, 2021.
http://hdl.handle.net/2123/17106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moon, Jiyoung. “Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
.” 2017. Web. 25 Feb 2021.
Vancouver:
Moon J. Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
. [Internet] [Thesis]. University of Sydney; 2017. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/2123/17106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moon J. Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
. [Thesis]. University of Sydney; 2017. Available from: http://hdl.handle.net/2123/17106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
MUHAMMAD IZHAM BIN ISMAIL.
Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究.
Degree: 博士（工学）, 2015, Kyoto Institute of Technology / 京都工芸繊維大学
URL: http://hdl.handle.net/10212/2265
► In this work, regularized lattice Boltzmann method (RLBM) was studied as a novel approach for applications in high Reynolds number and turbulent flow simulations. The…
(more)
▼ In this work, regularized lattice Boltzmann method (RLBM) was studied as a novel approach for applications in high Reynolds number and turbulent flow simulations. The effectiveness of the method is demonstrated by conducting simulations of two-dimensional lid-driven cavity flow, flow past two-dimensional circular cylinder, two- and three-dimensional homogeneous isotropic turbulence flows, and three-dimensional turbulent flow past circular cylinder. RLBM is a variation of single-relaxation-time lattice Boltzmann method (LBM) in which the collision term is regularized by using Chapman-Enskog expansion to derive the non-equilibrium part of the distribution function. Since the collision term is regularized, unlike the Bhatnagar-Gross-Krook (BGK) collision model, RLBM is more closely related to the multi-relaxation-time LBM (MRT-LBM). The advantages of RLBM over the standard LBM are improved numerical stability while maintaining the collision simplicity and lower memory usage. RLBM algorithm is also as simple as LBM. The flexibility of boundary condition implementations similar to the standard LBM, such as bounce-back boundary condition or non-equilibrium extrapolation boundary conditions. An RLBM code was developed for two- and three-dimensional incompressible flow simulations. The code was also written for parallel implementation using OpenMP. For two-dimensional case, simulations were conducted for the lid-driven cavity flow, flow past two-dimensional circular cylinder, flow past two-dimensional square cylinder in a channel and two-dimensional homogeneous isotropic turbulence. Results from these simulations were compared to the traditional finite difference Navier-Stokes solver, entropic lattice Boltzmann method (ELBM) and pseudospectral (PS) method. For three-dimensional case, simulations of three-dimensional homogeneous isotropic turbulence and turbulent ow past a circular cylinder were conducted. For these cases, the effect of under-resolved mesh was studied and compared to the large-eddy simulation based LBM (LES-LBM). Results from RLBM simulations were found to agree very well with the other mentioned methods. Results from two-dimensional flow simulations for all test cases were found to be in good agreement with the standard LBM, ELBM and PS method if the flow is well resolved. For under-resolved simulations, RLBM produced excellent pressure field without unphysical oscillations. A closer observation of the results showed that some form of artificial viscosity is inherent in RLBM. Although the phenomena itself is not necessarily bad, care must be taken when conducting RLBM simulations. The three-dimensional homogeneous isotropic turbulence simulations were conducted specifically to study the behavior of this artificial viscosity. It can be concluded that for well resolved simulations, the damping effect of artificial viscosity is negligible. For under-resolved simulations, the damping effect was found to filter-out high wave number component of the flow simulations. The effect of the artificial viscosity could be…
Subjects/Keywords: regularized lattice Boltzmann method; high Reynolds number flow; homogeneous isotropic turbulence; moment-based lattice Boltzmann method
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APA ·
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APA (6th Edition):
ISMAIL, M. I. B. (2015). Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究. (Thesis). Kyoto Institute of Technology / 京都工芸繊維大学. Retrieved from http://hdl.handle.net/10212/2265
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ISMAIL, MUHAMMAD IZHAM BIN. “Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究.” 2015. Thesis, Kyoto Institute of Technology / 京都工芸繊維大学. Accessed February 25, 2021.
http://hdl.handle.net/10212/2265.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ISMAIL, MUHAMMAD IZHAM BIN. “Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究.” 2015. Web. 25 Feb 2021.
Vancouver:
ISMAIL MIB. Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究. [Internet] [Thesis]. Kyoto Institute of Technology / 京都工芸繊維大学; 2015. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/10212/2265.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ISMAIL MIB. Study on Regularized Lattice Boltzmann Method for High Reynolds Number and Turbulent Flow Simulations : 正規化格子ボルツマン法における高レーノルズ数と乱流の流れのシミュレーションの研究. [Thesis]. Kyoto Institute of Technology / 京都工芸繊維大学; 2015. Available from: http://hdl.handle.net/10212/2265
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
13.
Shardt, Orest.
Simulations of Droplet Interactions with Lattice Boltzmann
Methods.
Degree: PhD, Department of Chemical and Materials
Engineering, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/x920fz543
► Interactions between droplets were studied using two lattice Boltzmann methods (LBMs). The Shan-Chen LBM, in which repulsive forces between fluids maintain phase separation, was used…
(more)
▼ Interactions between droplets were studied using two
lattice Boltzmann methods (LBMs). The Shan-Chen LBM, in which
repulsive forces between fluids maintain phase separation, was used
to simulate systems with three immiscible components. The
simulations demonstrated the three equilibrium configurations of
two droplets in a third fluid: adhering, separated, and engulfed.
Simulations of adhering droplet pairs, called Janus droplets due to
their two-sided structure, in shear flow revealed the structure of
the internal flow and the dependence of the rotation rate on the
orientation of the droplet. A second type of interaction between
droplets was simulated with the free-energy binary-liquid LBM:
binary droplet collisions in confined simple shear flow. The
conditions for coalescence were quantified and the effects of
geometry and the parameters of this Cahn-Hilliard-type phase field
model on the critical conditions were examined. Two parameters of
the phase field model, the thickness of the diffuse interface and
the mobility of the phase field, are important. Simulations with
highly-resolved droplets, with radii spanning 200 lattice nodes,
were used to determine the minimum film thickness before
coalescence, its relationship to the interface thickness, and the
effect of the mobility on the evolution of the minimum distance
between the droplet interfaces during collisions. The critical
conditions for coalescence in these simulations were compared with
published experiments with polymers. Unlike the experimental
polymer system, the interfaces of interacting droplets are often
charged, as in the case of oil-water emulsions. To simulate such
liquid systems, the free-energy binary-liquid LBM was coupled with
an iterative finite difference solver for the linearized
Poisson-Boltzmann equation that describes the electrostatic
potential near a charged surface in an electrolyte solution.
Simulations of collisions between charged droplets with constant
zeta potentials in a sheared electrolyte showed the effects of
surface charge on the critical conditions for
coalescence.
Subjects/Keywords: simulation; droplet; Janus droplet; phase field; Lattice Boltzmann Method; coalescence; Poisson-Boltzmann
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shardt, O. (2014). Simulations of Droplet Interactions with Lattice Boltzmann
Methods. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/x920fz543
Chicago Manual of Style (16th Edition):
Shardt, Orest. “Simulations of Droplet Interactions with Lattice Boltzmann
Methods.” 2014. Doctoral Dissertation, University of Alberta. Accessed February 25, 2021.
https://era.library.ualberta.ca/files/x920fz543.
MLA Handbook (7th Edition):
Shardt, Orest. “Simulations of Droplet Interactions with Lattice Boltzmann
Methods.” 2014. Web. 25 Feb 2021.
Vancouver:
Shardt O. Simulations of Droplet Interactions with Lattice Boltzmann
Methods. [Internet] [Doctoral dissertation]. University of Alberta; 2014. [cited 2021 Feb 25].
Available from: https://era.library.ualberta.ca/files/x920fz543.
Council of Science Editors:
Shardt O. Simulations of Droplet Interactions with Lattice Boltzmann
Methods. [Doctoral Dissertation]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/x920fz543
14.
Izarra, Léonard De.
Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media.
Degree: Docteur es, Physique, 2012, Université d'Orléans
URL: http://www.theses.fr/2012ORLE2001
► Les méthodes de Boltzmann sur réseaux (LBM) ont été appliquées avec beaucoup de succès aux écoulements hydrodynamiques en milieux poreux. Cependant, la limitation de ces…
(more)
▼ Les méthodes de Boltzmann sur réseaux (LBM) ont été appliquées avec beaucoup de succès aux écoulements hydrodynamiques en milieux poreux. Cependant, la limitation de ces méthodes aux écoulements hydrodynamiques et isothermes, les rendent insuffisantes pour simuler des écoulements de gaz dans des milieux micro-poreux. Dans ce cas, il est en effet fréquent que le libre parcours moyen des molécules du gaz, soit du même ordre de grandeur que la taille des pores dans lesquels il s’écoule. De tels écoulements ne seront alors plus en régime hydrodynamique, mais dans des régimes qualifiés de glissement et de transitionnel ; régimes pour lesquels les LBM standards ne sont plus valides. D’autre part, le caractère isotherme des LBM les rendent inutilisables, par exemple dans le cas où le gaz subit une détente à travers le milieu. Il est nécessaire, pour décrire de tels écoulements et phénomènes, de se placer au niveau cinétique. La démarche proposée repose sur la décomposition de la fonction de distribution sur la base des polynômes d’Hermite et l’emploi de la quadrature de Gauss-Hermite associée à cette projection. L’aspect systématique de ce développement amène naturellement à considérer divers ordres d’approximation de l’équation de Boltzmann-BGK sous diverses quadratures. Il résulte alors de ces différentes approximations toute une famille de discrétisations de l’équation de Boltzmann-BGK, dont les LBM classiques ne sont qu’un membre. La détermination de l’approximation la plus adaptée est réalisée par analyse systématique des résultats obtenus aux différents ordres d’approximation. Ces méthodes sont testées avec succès dans des cas modèles.
The lattice Boltzmann method (LBM) have been applied very successfully to hydrodynamic flows in porous media. However, the limitation of these methods to isothermal and hydrodynamic flows, make them inadequate to simulate gas flows in micro-porous media. Indeed, in these conditions, the mean free path of the molecules could be of the same magnitude order as the pore size in which gas flows. Such flows will not be in hydrodynamic regime, but in regimes qualified of, slip or transitional ; for which the LBM are no longer valid. On the other hand, the isothermal character of LBM make them unusable, for example, in the case where the gas undergoes expansion through the media. It is then necessary, to take the kinetic point of view to describe such flows and phenomena. The proposed approach is based on the decomposition of the distribution function on the Hermite polynomials basis and the use of Gauss-Hermite quadrature associated with this projection. The systematic nature of this development naturally leads to consider different order of approximation of the Boltzmann-BGK equation in various quadratures. It then follows from these various approximations, a family of discretizations of the Boltzmann-BGK equation, whose classical LBM are a member. Determining the most suitable approximation is achieved by systematic analysis of the results obtained with different approximation orders.…
Advisors/Committee Members: Rouet, Jean-Louis (thesis director), Izrar, Boujema (thesis director).
Subjects/Keywords: Méthodes de Boltzmann sur réseaux; Régime transitionnel; Lattice Boltzmann method; Transitional regime
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APA (6th Edition):
Izarra, L. D. (2012). Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2012ORLE2001
Chicago Manual of Style (16th Edition):
Izarra, Léonard De. “Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media.” 2012. Doctoral Dissertation, Université d'Orléans. Accessed February 25, 2021.
http://www.theses.fr/2012ORLE2001.
MLA Handbook (7th Edition):
Izarra, Léonard De. “Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media.” 2012. Web. 25 Feb 2021.
Vancouver:
Izarra LD. Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media. [Internet] [Doctoral dissertation]. Université d'Orléans; 2012. [cited 2021 Feb 25].
Available from: http://www.theses.fr/2012ORLE2001.
Council of Science Editors:
Izarra LD. Apport des méthodes cinétiques à la simulation d'écoulements dans les milieux poreux : Contribution of kinetic methods for the simulation of flows in porous media. [Doctoral Dissertation]. Université d'Orléans; 2012. Available from: http://www.theses.fr/2012ORLE2001
15.
Corre, Samuel.
Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems.
Degree: Docteur es, Mathématiques et leurs Interactions, 2018, Rennes, INSA
URL: http://www.theses.fr/2018ISAR0022
► L'objectif de cette thèse est de développer et d'analyser des techniques numériques basées sur la méthode e Boltzmann sur réseau (LBM) pour résoudre des systèmes…
(more)
▼ L'objectif de cette thèse est de développer et d'analyser des techniques numériques basées sur la méthode e Boltzmann sur réseau (LBM) pour résoudre des systèmes non linéaires de type advection-réaction-diffusion provenant de la physique et de la biologie. Avec la LBM, des problèmes portant sur des quantités moyennées densité, potentiel, vitesse, etc) sont exprimés à l'échelle particulaire. Nous approchons la solution de l'équation e Boltzmann relative au comportement d'un champs de particules puis nous recomposons les quantités moyennées solutions des équations traitées. Dans un premier temps, nous développons un cadre général approprié permettant de traiter plusieurs types de systèmes non linéaires (paraboliques, elliptiques, ou couplées ' variables réelles ou complexes), avec des applications à des modèles tels que Burger-Fisher, écoulement de fluides en milieu poreux, Helmoltz, Patlar-Keller-Segel, ou encore Schrodinger. Pour chaque problème, nous analysons le comportement asymptotique de la méthode, quand le nombre de Knudsen tend vers zéro (par le développement de Chapman-Enskog) et nous effectuons l'analyse numérique de la convergence et de la stabilité de la méthode. Dans un deuxième temps, nous nous intéressons à un problème réaliste d'électrophysiologie cardio-vasculaire. Nous adaptons la méthode LBM développée pour approcher les solutions d'un système de type bidomaine permettant de simuler le comportement de potentiels électriques et les interactions ioniques ans la région du myocarde. L'étude et la modélisation d'un tel type de problème est un enjeu sanitaire majeur ans le traitement des pathologies liées par exemple à l'arythmie cardiaque. Notre but étant d'obtenir des comportements réalistes, nous introduisons au sein de ce système bidomaine des opérateurs de retard afin de tenir compte des temps de retard dans les transmissions de signaux. Une fois l'existence et l'unicité de la solution démontrées, nous proposons une série de simulations avec des paramètres physiques et biologiques réalistes afin de valider la méthode proposée.
In this thesis, we develop and analyze numerical techniques based on the lattice Boltzmann method LBM) for solving systems of nonlinear advection-diffusion-reaction equations from physics and biology. Wi BM, problems relating to averaged quantities (density, potential, velocities, etc.) are expressed at the particle scale. We approach the solution of Boltzmann equation relating to the behavior of a particle field and then we recompose the averaged quantities solutions of treated systems. In the first part, we develop an appropriate general framework to deal with several types of non-linear systems (parabolic, elliptic, or coupled, with real or complex variables), with applications to models such as Burger-Fisher, fluid flow in a porous medium, Helmoltz, Patlar-Keller-Segel, or Schrodinger. For each problem, we analyze the asymptotic behavior of the method, when the number of Knudsen tends to zero (by the development of Chapman-Enskog) and we perform the numerical analysis…
Advisors/Committee Members: Belmiloudi, Aziz (thesis director).
Subjects/Keywords: Méthode de Boltzmann sur réseau; Electrocardiographie; Analyse numérique; Numerical analysis; Electrophysiology; Lattice Boltzmann method; 510
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APA (6th Edition):
Corre, S. (2018). Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems. (Doctoral Dissertation). Rennes, INSA. Retrieved from http://www.theses.fr/2018ISAR0022
Chicago Manual of Style (16th Edition):
Corre, Samuel. “Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems.” 2018. Doctoral Dissertation, Rennes, INSA. Accessed February 25, 2021.
http://www.theses.fr/2018ISAR0022.
MLA Handbook (7th Edition):
Corre, Samuel. “Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems.” 2018. Web. 25 Feb 2021.
Vancouver:
Corre S. Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems. [Internet] [Doctoral dissertation]. Rennes, INSA; 2018. [cited 2021 Feb 25].
Available from: http://www.theses.fr/2018ISAR0022.
Council of Science Editors:
Corre S. Méthodes de Boltzmann sur réseau pour la simulation numérique de certains systèmes d'advection-réactiondiffusion provenant de la physique et de la biologie, et analyse mathématique et numérique de problèmes issus du domaine biomédical cardio-vasculaire : Lattice Boltzmann methods for the numerical simulation of some advection-reaction-diffusion systems from physic and biology, and mathematical and numerical analysis of cardiac electrophysiology problems. [Doctoral Dissertation]. Rennes, INSA; 2018. Available from: http://www.theses.fr/2018ISAR0022
University of Manchester
16.
O'Connor, Joseph Michael.
Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures.
Degree: 2018, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:316881
► The fluid-structure interactions of wall-mounted slender structures, such as cilia, filaments, flaps, and flags, play an important role in a broad range of physical processes:…
(more)
▼ The fluid-structure interactions of wall-mounted
slender structures, such as cilia, filaments, flaps, and flags,
play an important role in a broad range of physical processes: from
the coherent waving motion of vegetation, to the passive flow
control capability of hair-like surface coatings. While these
systems are ubiquitous, their coupled nonlinear response exhibits a
wide variety of behaviours that is yet to be fully understood,
especially when multiple structures are considered. The purpose of
this work is to investigate, via numerical simulation, the
fluid-structure interactions of arrays of slender structures over a
range of input conditions. A direct modelling approach, whereby the
individual structures and their dynamics are fully resolved, is
realised via a
lattice Boltzmann-immersed boundary model, which is
coupled to two different structural solvers: an Euler-Bernoulli
beam model, and a finite element model. Results are presented for
three selected test cases - which build in scale from a single flap
in a periodic array, to a small finite array of flaps, and finally
to a large finite array - and the key behaviour modes are
characterised and quantified. Results show a broad range of
behaviours, which depend on the flow conditions and structural
properties. In particular, the emergence of coherent waving motions
are shown to be closely related to the natural frequency of the
array. Furthermore, this behaviour is associated with a lock-in
between the natural frequency of the array and the predicted
frequency of the fluid instabilities. The original contributions of
this work are: the development and application of a numerical tool
for direct modelling of large arrays of slender structures; the
characterisation of the behaviour of slender structures over a
range of input conditions; and the exposition of key behaviour
modes of slender structures and their relation to input
conditions.
Advisors/Committee Members: MANDAL, PARTHASARATHI P, DAY, PHILIP PJR, Revell, Alistair, Mandal, Parthasarathi, Day, Philip.
Subjects/Keywords: fluid-structure interaction; flexible slender structures; lattice Boltzmann method; immersed boundary method; finite element method
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
O'Connor, J. M. (2018). Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:316881
Chicago Manual of Style (16th Edition):
O'Connor, Joseph Michael. “Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 25, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:316881.
MLA Handbook (7th Edition):
O'Connor, Joseph Michael. “Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures.” 2018. Web. 25 Feb 2021.
Vancouver:
O'Connor JM. Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Feb 25].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:316881.
Council of Science Editors:
O'Connor JM. Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:316881
17.
Owen, Benjamin Joseph.
Development of a discrete fluid-structure interaction
method for cardiovascular applications.
Degree: 2019, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320620
► The interaction between blood and cardiovascular tissue is known to play a significant role in the development cardiovascular diseases and associated conditions. With the ever…
(more)
▼ The interaction between blood and cardiovascular
tissue is known to play a significant role in the development
cardiovascular diseases and associated conditions. With the ever
increasing availability and performance of computational resources,
in conjunction with improved understanding of the disease
mechanisms, the integration of numerical analysis into in silico
tools has become more prevalent. Once viewed as emerging
technology, these tools are now being routinely utilised in
clinical practice. However, the majority of these tools consider
the fluid or structure in isolation. This is due to the added
complexity of coupling the methods and the computational cost
incurred through modelling fluid-structure interaction using
traditional continuum methods. As a result, discretisations of the
structure used in fluid-structure interaction (FSI) methods tend to
be simpler representations and offer limited potential to model
complex non-linear material properties and discrete effects such as
rupture. The purpose of this work is to develop an efficient
fluid-structure interaction
method capable of modelling complex
phenomena. The inherent parallel performance of discrete numerical
methods is explored, with a long-term view to developing the
method
for use in clinical tools; where speed, robustness and adaptability
are paramount. In the present work, the fluid is represented via
the
lattice Boltzmann method and the structure via the vector-based
discrete element
method, known as the V-model. These solvers are
strongly coupled using a version of the immersed boundary
method
based on direct forcing in a block Gauss-Seidel scheme, where the
time step size of the fluid and structure are to be kept
independent. Validation results for the V-model show good agreement
with analytical and numerical solutions for static and dynamic
cantilever beam cases with constant and time-varying external
loads. This demonstrates the V-model's ability to accurately
capture the mechanical response of a material before extending the
method to model more complex physics. GPU implementation of the
V-model demonstrated speed-ups of x50 relative to an optimised
serial CPU implementation. The FSI
method demonstrated good
agreement with numerical benchmark data while stochastic modelling
of the structure material properties demonstrated the V-model's
potential to model variation in cardiovascular tissue that occurs
naturally and due to disease. The major original contributions of
this work include the implementation and elucidation of a recently
developed structure model; which is used here for the first time
with a
lattice Boltzmann scheme. The work also provides first steps
towards the use of stochastic modelling using the V-model, the
first GPU implementation of the V-model, and development of the
first strongly coupled fluid-structure interaction
method to
include the V-model.
Advisors/Committee Members: BOJDO, NICHOLAS NM, KEAVNEY, BERNARD B, HARWOOD, ADRIAN ARG, Revell, Alistair, Bojdo, Nicholas, Keavney, Bernard, Harwood, Adrian.
Subjects/Keywords: fluid-structure interaction; numerical modelling; GPU; discrete element method; lattice Boltzmann method; immersed boundary method
Record Details
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Record Details
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Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Owen, B. J. (2019). Development of a discrete fluid-structure interaction
method for cardiovascular applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320620
Chicago Manual of Style (16th Edition):
Owen, Benjamin Joseph. “Development of a discrete fluid-structure interaction
method for cardiovascular applications.” 2019. Doctoral Dissertation, University of Manchester. Accessed February 25, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320620.
MLA Handbook (7th Edition):
Owen, Benjamin Joseph. “Development of a discrete fluid-structure interaction
method for cardiovascular applications.” 2019. Web. 25 Feb 2021.
Vancouver:
Owen BJ. Development of a discrete fluid-structure interaction
method for cardiovascular applications. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Feb 25].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320620.
Council of Science Editors:
Owen BJ. Development of a discrete fluid-structure interaction
method for cardiovascular applications. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320620
18.
Owen, Benjamin.
Development of a discrete fluid-structure interaction method for cardiovascular applications.
Degree: PhD, 2019, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-discrete-fluidstructure-interaction-method-for-cardiovascular-applications(9e018b74-f810-4201-8a26-2f4d91d34efa).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785672
► The interaction between blood and cardiovascular tissue is known to play a significant role in the development cardiovascular diseases and associated conditions. With the ever…
(more)
▼ The interaction between blood and cardiovascular tissue is known to play a significant role in the development cardiovascular diseases and associated conditions. With the ever increasing availability and performance of computational resources, in conjunction with improved understanding of the disease mechanisms, the integration of numerical analysis into in silico tools has become more prevalent. Once viewed as emerging technology, these tools are now being routinely utilised in clinical practice. However, the majority of these tools consider the fluid or structure in isolation. This is due to the added complexity of coupling the methods and the computational cost incurred through modelling fluid-structure interaction using traditional continuum methods. As a result, discretisations of the structure used in fluid-structure interaction (FSI) methods tend to be simpler representations and offer limited potential to model complex non-linear material properties and discrete effects such as rupture. The purpose of this work is to develop an efficient fluid-structure interaction method capable of modelling complex phenomena. The inherent parallel performance of discrete numerical methods is explored, with a long-term view to developing the method for use in clinical tools; where speed, robustness and adaptability are paramount. In the present work, the fluid is represented via the lattice Boltzmann method and the structure via the vector-based discrete element method, known as the V-model. These solvers are strongly coupled using a version of the immersed boundary method based on direct forcing in a block Gauss-Seidel scheme, where the time step size of the fluid and structure are to be kept independent. Validation results for the V-model show good agreement with analytical and numerical solutions for static and dynamic cantilever beam cases with constant and time-varying external loads. This demonstrates the V-model's ability to accurately capture the mechanical response of a material before extending the method to model more complex physics. GPU implementation of the V-model demonstrated speed-ups of x50 relative to an optimised serial CPU implementation. The FSI method demonstrated good agreement with numerical benchmark data while stochastic modelling of the structure material properties demonstrated the V-model's potential to model variation in cardiovascular tissue that occurs naturally and due to disease. The major original contributions of this work include the implementation and elucidation of a recently developed structure model; which is used here for the first time with a lattice Boltzmann scheme. The work also provides first steps towards the use of stochastic modelling using the V-model, the first GPU implementation of the V-model, and development of the first strongly coupled fluid-structure interaction method to include the V-model.
Subjects/Keywords: immersed boundary method; discrete element method; lattice Boltzmann method; numerical modelling; fluid-structure interaction; GPU
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Owen, B. (2019). Development of a discrete fluid-structure interaction method for cardiovascular applications. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-discrete-fluidstructure-interaction-method-for-cardiovascular-applications(9e018b74-f810-4201-8a26-2f4d91d34efa).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785672
Chicago Manual of Style (16th Edition):
Owen, Benjamin. “Development of a discrete fluid-structure interaction method for cardiovascular applications.” 2019. Doctoral Dissertation, University of Manchester. Accessed February 25, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-discrete-fluidstructure-interaction-method-for-cardiovascular-applications(9e018b74-f810-4201-8a26-2f4d91d34efa).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785672.
MLA Handbook (7th Edition):
Owen, Benjamin. “Development of a discrete fluid-structure interaction method for cardiovascular applications.” 2019. Web. 25 Feb 2021.
Vancouver:
Owen B. Development of a discrete fluid-structure interaction method for cardiovascular applications. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Feb 25].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-discrete-fluidstructure-interaction-method-for-cardiovascular-applications(9e018b74-f810-4201-8a26-2f4d91d34efa).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785672.
Council of Science Editors:
Owen B. Development of a discrete fluid-structure interaction method for cardiovascular applications. [Doctoral Dissertation]. University of Manchester; 2019. Available from: https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-discrete-fluidstructure-interaction-method-for-cardiovascular-applications(9e018b74-f810-4201-8a26-2f4d91d34efa).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785672
19.
Song, Pai.
Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules.
Degree: PhD, Mathematics and Statistics, 2019, Old Dominion University
URL: 9781392721667
;
https://digitalcommons.odu.edu/mathstat_etds/112
► A comprehensive two- and three-dimensional framework for the electrohydrodynamic simulation of deformable capsules is provided. The role of a direct current (DC) electric field…
(more)
▼ A comprehensive two- and three-dimensional framework for the electrohydrodynamic simulation of deformable capsules is provided. The role of a direct current (DC) electric field on the deformation and orientation of a liquid-filled capsule is thoroughly considered numerically. This framework is based on
lattice Boltzmann method for the fluid, finite element
method for the membrane structure of the capsule, fast immersed interface
method for the electric field and immersed boundary
method being used to consider the fluid-structure-electric interaction. Under the effect of electric field, two different types of equilibrium states, prolate or oblate are obtained. The numerical algorithm is also applied to study the interfacial tension droplet and red blood cell under shear flow. The capsules are more deformed and arrive at equilibrium status more quickly under stronger electric field. Bending stiffness will suppress the deformation and cause transition from tank-treading to tumbling for the red blood cell. However, the applied electric field will slow down the transition from tank-treading to the tumbling motion or even stay in the tank-treading motion with stronger electric field.
Advisors/Committee Members: Yan Peng, Richard D. Noren, Ruhai Zhou, Xiaoyu Zhang.
Subjects/Keywords: Capsule; Deformation; Electrohydrodynamics; Immersed boundary method; Immersed interface method; Lattice Boltzmann method; Applied Mathematics
Record Details
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Record Details
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« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Song, P. (2019). Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules. (Doctoral Dissertation). Old Dominion University. Retrieved from 9781392721667 ; https://digitalcommons.odu.edu/mathstat_etds/112
Chicago Manual of Style (16th Edition):
Song, Pai. “Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules.” 2019. Doctoral Dissertation, Old Dominion University. Accessed February 25, 2021.
9781392721667 ; https://digitalcommons.odu.edu/mathstat_etds/112.
MLA Handbook (7th Edition):
Song, Pai. “Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules.” 2019. Web. 25 Feb 2021.
Vancouver:
Song P. Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules. [Internet] [Doctoral dissertation]. Old Dominion University; 2019. [cited 2021 Feb 25].
Available from: 9781392721667 ; https://digitalcommons.odu.edu/mathstat_etds/112.
Council of Science Editors:
Song P. Electrohydrodynamic Simulations of the Deformation of Liquid-Filled Capsules. [Doctoral Dissertation]. Old Dominion University; 2019. Available from: 9781392721667 ; https://digitalcommons.odu.edu/mathstat_etds/112
NSYSU
20.
Ho, Yen-ting.
3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1127115-215754
► In the present study, the thermal lattice Boltzmann scheme is used for simulating the natural convection in cubical enclosure with different inner cylinder position in…
(more)
▼ In the present study, the thermal
lattice Boltzmann scheme is used for simulating the natural convection in cubical enclosure with different inner cylinder position in different Rayleigh numbers of 10
4 ~ 10
6 at Prandtl number of 0.7. The location of the inner cylinder is changed vertically along the centerline of the enclosure. The transient state and steady state results are investigated and analyzed. The effects of the boundary wall on heat transfer and fluid flow in the enclosure depend on both the position of the cylinder and the Rayleigh number. Detailed discussion for the streamline, isotherms, and Nusselt number distribution is presented in this paper.
Advisors/Committee Members: Chien-Chou Tseng (chair), Kuang C. Lin (committee member), Sodio C. N. Hsu (chair), Hsu, Shen-Yen (chair), Ho-Shuenn Huang (chair).
Subjects/Keywords: Cubical enclosure; Ineer cylinder; Natural convection; Complex geometry; Lattice Boltzmann method
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APA (6th Edition):
Ho, Y. (2015). 3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1127115-215754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ho, Yen-ting. “3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder.” 2015. Thesis, NSYSU. Accessed February 25, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1127115-215754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ho, Yen-ting. “3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder.” 2015. Web. 25 Feb 2021.
Vancouver:
Ho Y. 3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Feb 25].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1127115-215754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ho Y. 3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1127115-215754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
21.
Erickson, Lindsay Crowl.
Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach.
Degree: PhD, Mathematics;, 2010, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1583/rec/164
We develop a novel Lattice Boltzmann-Immersed Boundary method to simulate the motion of whole blood. This method is applied to explore the experimentally-observed redistribution of platelets and the enhanced mixing of chemicals in concentrated suspensions of red blood cells undergoing channel flow.
Subjects/Keywords: Blood; Immersed boundary method; Lattice boltzmann; Platelets; Red blood cells
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APA (6th Edition):
Erickson, L. C. (2010). Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1583/rec/164
Chicago Manual of Style (16th Edition):
Erickson, Lindsay Crowl. “Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach.” 2010. Doctoral Dissertation, University of Utah. Accessed February 25, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1583/rec/164.
MLA Handbook (7th Edition):
Erickson, Lindsay Crowl. “Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach.” 2010. Web. 25 Feb 2021.
Vancouver:
Erickson LC. Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach. [Internet] [Doctoral dissertation]. University of Utah; 2010. [cited 2021 Feb 25].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1583/rec/164.
Council of Science Editors:
Erickson LC. Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach. [Doctoral Dissertation]. University of Utah; 2010. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1583/rec/164
University of Alberta
22.
Wasylkiewicz, Monika J.
Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds.
Degree: MS, Department of Chemical and Materials
Engineering, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/gf06g3210
► Introduction of a binding or reacting liquid into a gas-solid fluidized bed is common in industrial processes (e.g. fluid coking, catalytic cracking, granulation). Ability of…
(more)
▼ Introduction of a binding or reacting liquid into a
gas-solid fluidized bed is common in industrial processes (e.g.
fluid coking, catalytic cracking, granulation). Ability of the
liquid to spread and the attractive effect on particles due to
liquid bridge formation alter the fluidization behavior and process
efficiency. Direct numerical simulations are performed using the
lattice-Boltzmann method, with liquid modeled as a scalar
transferred during particle collisions. A liquid spreading model is
introduced based on a liquid bridge growth rate, and liquid
spreading is studied and analyzed in terms of diffusion
coefficients. Then, a system of homogeneously wetted particles is
simulated, with an attractive force applied between adjacent
particles. Aggregate sizes and fluidization behavior are examined.
Liquid diffusion is slower horizontally than vertically. The
relation between liquid spreading and solids volume fraction
depends on liquid viscosity and surface tension. Systems simulated
generally completely aggregate, with aggregation resulting in slip
velocity increases.
Subjects/Keywords: aggregation; wet particles; gas fluidization; lattice-Boltzmann method; liquid spreading
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Manager
APA (6th Edition):
Wasylkiewicz, M. J. (2014). Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/gf06g3210
Chicago Manual of Style (16th Edition):
Wasylkiewicz, Monika J. “Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds.” 2014. Masters Thesis, University of Alberta. Accessed February 25, 2021.
https://era.library.ualberta.ca/files/gf06g3210.
MLA Handbook (7th Edition):
Wasylkiewicz, Monika J. “Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds.” 2014. Web. 25 Feb 2021.
Vancouver:
Wasylkiewicz MJ. Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Feb 25].
Available from: https://era.library.ualberta.ca/files/gf06g3210.
Council of Science Editors:
Wasylkiewicz MJ. Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/gf06g3210
University of Manchester
23.
Zhang, Qiangjun.
Fire performance of graphene/epoxy composites and
feasibility for aerospace applications.
Degree: 2019, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320940
► Graphene-based composites possess great potentials for applications in the aerospace industry owing to their superior properties. This thesis quantifies the effects of graphene nanoplatelets (GNPs)…
(more)
▼ Graphene-based composites possess great potentials
for applications in the aerospace industry owing to their superior
properties. This thesis quantifies the effects of graphene
nanoplatelets (GNPs) on the combustion behaviour of epoxy resin
(ER) through a numerical modelling approach. Five different GNP/ER
composites with different amounts and types of GNPs were prepared.
At 3 wt% GNP loading, the peak heat release rate (PHRR) could be
reduced by 47%. This drastic reduction in PHRR due to the GNPs is
attributed to two principal contributions: (1) the reduced gas
permeability slows down movement of volatiles to the surface to
cause combustion, and (2) the reduced radiant conductivity of the
GNP/ER char at high temperatures owing to GNPs being able to
promote the formation of a continuous and compact char layer. This
thesis ultimately provides a new
method to quantify these two
contributions focusing on the physical barrier effect of GNP in ER
composites and ER char. A first simulation model based on the
Lattice Boltzmann Method (LBM) and supported by X-ray CT and
scanning electron microscope (SEM) images for geometry input, is
developed and validated. The model can be used for predicting the
gas permeability of GNP/ER composites at ambient temperature and
the GNP/ER char during the combustion. The main conclusions in this
respect are: (i) virgin composites with inclusion of GNPs in ER
significantly decrease their effective gas permeability (66%
reduction for 3 wt% GNP); (ii) aggregation of GNPs resulted in less
barrier effect; (iii) GNPs reduced the gas permeability of ER char
to one order of magnitude lower at 3 wt% loading. Radiant
conductivity of the GNP/ER char is calculated by an analytical
relation. Thermal and physical parameters of ER are optimised using
a parameter optimisation
method. The general pyrolysis model is
then built to simulate the mass loss of GNP/ER composites under
cone calorimeter testing. The reduction of PHRR due to GNP is
numerically quantified, and agrees well with the author’s cone
test results. The FDS simulations are performed to assess the
potential of different GNP/ER composites for their capacity to pass
the vertical burning test requirements and make them fit for
aerospace applications. This numerical approach has shown a great
potential to improve the material design process of graphene-based
composites and is able to predict the fire behaviour of such
composites in realistic fire conditions.
Advisors/Committee Members: BAILEY, COLIN CG, Wang, Yong, Bailey, Colin.
Subjects/Keywords: graphene; epoxy composite; fire behaviour; Lattice Boltzmann Method; gas permeability; pyrolysis
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Manager
APA (6th Edition):
Zhang, Q. (2019). Fire performance of graphene/epoxy composites and
feasibility for aerospace applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320940
Chicago Manual of Style (16th Edition):
Zhang, Qiangjun. “Fire performance of graphene/epoxy composites and
feasibility for aerospace applications.” 2019. Doctoral Dissertation, University of Manchester. Accessed February 25, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320940.
MLA Handbook (7th Edition):
Zhang, Qiangjun. “Fire performance of graphene/epoxy composites and
feasibility for aerospace applications.” 2019. Web. 25 Feb 2021.
Vancouver:
Zhang Q. Fire performance of graphene/epoxy composites and
feasibility for aerospace applications. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Feb 25].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320940.
Council of Science Editors:
Zhang Q. Fire performance of graphene/epoxy composites and
feasibility for aerospace applications. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:320940
University of Manitoba
24.
Arabjamaloei, Rasoul.
Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation.
Degree: Mechanical Engineering, 2016, University of Manitoba
URL: http://hdl.handle.net/1993/32356
► In this research, single phase flow regimes in porous media were studied both numerically and experimentally to determine methods to predict the effects of rarefied…
(more)
▼ In this research, single phase flow regimes in porous media were studied both numerically and experimentally to determine methods to predict the effects of rarefied gas flow and inertial flow. The results of this research were initially compared with the convention methods of treating rarefied gas flow, the Klinkenberg equation and inertial flow, the Forchheimer equation. In the first section of the research, the slip condition for rarefied gas flow in low permeability, two-dimensional simple porous media was studied by the
Lattice Boltzmann method (LBM) and new corrections to the Klinkenberg model and higher order slip models were investigated. To apply LBM, new corrections were introduced to the solid-fluid boundary condition and a new relationship was proposed to relate LBM viscosity and Knudsen number. To validate the LBM model, the slip flow simulation results were compared to analytical methods and experimentation. It was shown that the modified LBM simulator was capable of predicting the experimentally observed Knudsen minimum. By comparing the numerical simulation results with analytical models extracted from the up-to-date literature, the analytical model that most closely matched numerical model results was identified.
In the second section of this research, the apparent permeability reduction due to inertial effects in simple and complex porous structures was studied. LBM based simulator was developed to model single-phase three-dimensional fluid flow in porous media. The simulator was verified by experimental and analytical solution tests and then was implemented to study high Reynolds number flow processes in irregular shaped porous structures. The effects of inertial on the onset and extent of non-Darcy flow in different geometries was studied. It was shown that the Forchheimer equation does not accurately fit the high Reynolds number flow. A new empirical correlation was proposed that correlates the scaled permeability and mass flow rate relationship very well and is more accurate than the Forchheimer equation. To validate the LBM, a modified experimental technique was designed and utilized to analyze permeability and mass flow rate relationships in high Reynolds number flows. The experimental results showed that the correlation in the present research is far more accurate than the Forchheimer equation.
Advisors/Committee Members: Ruth, Douglas (Mechanical Engineering) (supervisor), Wang, Bing-Chen (Mechanical Engineering).
Subjects/Keywords: Fluid dynamics; Porous Media; Lattice boltzmann method; Slip flow; Inertial flow
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APA (6th Edition):
Arabjamaloei, R. (2016). Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/32356
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Arabjamaloei, Rasoul. “Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation.” 2016. Thesis, University of Manitoba. Accessed February 25, 2021.
http://hdl.handle.net/1993/32356.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Arabjamaloei, Rasoul. “Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation.” 2016. Web. 25 Feb 2021.
Vancouver:
Arabjamaloei R. Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation. [Internet] [Thesis]. University of Manitoba; 2016. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/1993/32356.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Arabjamaloei R. Modeling flow regimes in porous media: correcting permeability models by combining numerical simulation and experimentation. [Thesis]. University of Manitoba; 2016. Available from: http://hdl.handle.net/1993/32356
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Hong Kong University of Science and Technology
25.
Mesgari Sohani, Sara CIVL.
A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.
Degree: 2015, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-94661
;
http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
► Planned transient waves can be beneficially used in the detection of defects in pipelines. Such applications show that the higher is the frequency of the…
(more)
▼ Planned transient waves can be beneficially used in the detection of defects in pipelines. Such applications show that the higher is the frequency of the injected wave the better is the detection. Finite volume (FV) methods have recently been applied to waterhammer problems and are known to be well suited for high frequency waves. However, FV methods are formulated for simple boundary conditions such no-flux or no-slip, but not for typical boundary conditions in pressurized pipeline systems (e.g., junctions, control valves, orifices, tanks, and reservoirs). In the instances in the literature where FV has been applied to waterhammer problems, the approach has been to use FV for internal sections and the Method of Characteristics (MOC) at the boundaries. This global order of accuracy of the FV-MOC is governed by the MOC solution. This thesis is a first attempt in handling boundary conditions within the FV framework. The approach places the boundary element within a FV to enforce mass and momentum conservation within this volume. The fluxes between the FV and the adjacent elements are then formulated in the usual manner. The approach is illustrated for the case of a valve, a reservoir and a junction. The finite volume method used is the Boltzmann-type scheme, which is a mesoscopic model. In particular, the 1st and 2nd-order collisionless Boltzmann-type scheme (i.e., the kinetic flux vector splitting (KFVS)) and the 2nd-order Bhatnagar-Gross-Krook (BGK) Boltzmann scheme are formulated and applied to one-dimensional transient flows. The accuracy and efficiency of all schemes with the proposed non-iterative FV formulation of the boundary conditions are demonstrated through the following test cases: (i) problems due to sudden closing of a valve, (ii) wave interactions with a junction boundary characterized by a geometric discontinuity, (iii) wave interactions with a junction boundary characterized by a discontinuity in the value of wave speed, and (iv) wave interactions with a junction characterized by a flow rate discontinuity. The pure FV formulation guarantees the mass and momentum conservation. The Boltzmann-based FV schemes capture the discontinuity as well as wave interaction with boundary elements accurately. The stability of the proposed FV schemes is satisfied when Cr < 0:5. The comparison between the efficiency of the conventional scheme (i.e., the Fix- MOC and Godunov schemes) and those of the mesoscopic-based schemes (i.e., the KFVS and BGK schemes) reveals that none of the proposed schemes is better than the 2nd-order Godunov scheme for classical waterhammer. Nevertheless, it is found that the CPU time needed by the 2nd-order BGK scheme to achieve a predefined degree of accuracy is not too far from that by the 2nd-order Godunov scheme. The KFVS scheme is more dissipative than the BGK scheme due to the lack of particle collisions in the formulation.
Subjects/Keywords: Water hammer
; Mathematical models
; Finite volume method
; Lattice Boltzmann methods
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APA (6th Edition):
Mesgari Sohani, S. C. (2015). A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-94661 ; http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mesgari Sohani, Sara CIVL. “A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.” 2015. Thesis, Hong Kong University of Science and Technology. Accessed February 25, 2021.
http://repository.ust.hk/ir/Record/1783.1-94661 ; http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mesgari Sohani, Sara CIVL. “A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.” 2015. Web. 25 Feb 2021.
Vancouver:
Mesgari Sohani SC. A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2015. [cited 2021 Feb 25].
Available from: http://repository.ust.hk/ir/Record/1783.1-94661 ; http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mesgari Sohani SC. A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. [Thesis]. Hong Kong University of Science and Technology; 2015. Available from: http://repository.ust.hk/ir/Record/1783.1-94661 ; http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rice University
26.
Lin, Pei-Hsuan.
Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media.
Degree: PhD, Engineering, 2018, Rice University
URL: http://hdl.handle.net/1911/105917
► Asphaltene deposition in porous media has significant effects on oil flow during primary and secondary oil production. When asphaltenes deposit in porous media, the pore…
(more)
▼ Asphaltene deposition in porous media has significant effects on oil flow during primary and secondary oil production. When asphaltenes deposit in porous media, the pore throats become plugged, leading to the impairment of permeability, and in turn causes several difficulties for oil production.
In order to solve the problem of asphaltene deposition in porous media, it is important to understand the mechanism of asphaltene deposition in order to find measures to mitigate this problem. Moreover, a predictive model would greatly help control and reduce asphaltene deposition at the early stage. However, the mechanism of asphaltene deposition in porous media is still unclear. Only a few deposition models have been proposed and most of them have too many fitting parameters. Hence, the objective of this study is to propose a new model which has a fewer number of fitting parameters but still effectively predicts asphaltene deposition. Furthermore, the validity of the proposed model will be verified by microchannel and core flooding experiments.
Instead of using the traditional Computational Fluid Dynamics (CFD) methods, such as the Finite Element
Method, Finite Difference
Method, and Finite Volume
Method, the
Lattice Boltzmann Method (LBM) is employed to model asphaltene deposition in porous media. The benefit of using LBM for simulating fluid flow in complex geometric settings is that it is comparatively easier for computational implementation and parallel computing due to being a meshless technique.
Once the mechanism of asphaltene deposition in porous media has been understood clearly, mitigation methods can be then applied to prevent asphaltene deposition. Also, the simulation tool that is developed using LBM can help reduce the cost involved in experiments, which is extremely important in the petroleum industry.
Advisors/Committee Members: Vargas, Francisco (advisor), Biswal, Sibani L. (committee member), Akin, John E. (committee member).
Subjects/Keywords: Asphaltene Deposition; Lattice Boltzmann Method; Porous Media Modeling; Computational Fluid Dynamics
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lin, P. (2018). Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/105917
Chicago Manual of Style (16th Edition):
Lin, Pei-Hsuan. “Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media.” 2018. Doctoral Dissertation, Rice University. Accessed February 25, 2021.
http://hdl.handle.net/1911/105917.
MLA Handbook (7th Edition):
Lin, Pei-Hsuan. “Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media.” 2018. Web. 25 Feb 2021.
Vancouver:
Lin P. Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media. [Internet] [Doctoral dissertation]. Rice University; 2018. [cited 2021 Feb 25].
Available from: http://hdl.handle.net/1911/105917.
Council of Science Editors:
Lin P. Lattice-Boltzmann Modeling of Potential Fluid Flow Impairment Caused by Asphaltene Deposition in Porous Media. [Doctoral Dissertation]. Rice University; 2018. Available from: http://hdl.handle.net/1911/105917
Delft University of Technology
27.
Ballapur Jayasimha, Athreya (author).
An Investigation of Dynamic Stall using a LBM-VLES Approach.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1d92064a-bfe8-4091-a0b5-6246b33ae5b1
► Horizontal Axis Wind Turbines (HAWTs) are a very popular source of renewable energy, but these machines are often subject to off-design conditions owing to the…
(more)
▼ Horizontal Axis Wind Turbines (HAWTs) are a very popular source of renewable energy, but these machines are often
subject to off-design conditions owing to the unsteady nature of wind. Unsteady aerodynamic conditions have been associated with cyclic loading of turbine blades, which can have hugely detrimental effects on their operational life. When subjected to unsteady aerodynamic conditions, the blade sees an overshoot of lift as compared to steady cases. At high angles of attack, the blade witnesses a very sharp stall from which it may or may not recover. The excursion of lift and subsequent sharp stall cause the lift curve to exhibit hysteresis behaviour, which outlines the phenomenon of dynamic stall. Continued recurrence of dynamic stall in gusty conditions leads to increased risk of failure due to fatigue loading. The primary aim of this project was to investigate the prediction of dynamic stall in quasi two-dimensional (2D) and strongly three-dimensional (3D) flows, using the
Lattice-
Boltzmann Method (LBM) based solver, PowerFLOW. The first part of the project dealt with simulation of dynamic stall in quasi-two dimensional flow. Validation of the computational data was performed against experimental data published by the Ohio State University (OSU) and the National Renewable Energy laboratory (NREL). Simulations were performed for two configurations – the first set with a clean leading edge, and the second set employing a leading edge surface roughness. The second part of the project dealt with the analysis of strongly 3D flow conditions wherein the pitching blade was also
subject to rotation. Rotation was implemented using a stationary local reference frame. In both stages, flow field data was analysed using a mix of velocity, vorticity and pressure plots. For the 3D simulation, skin friction was also investigated as a measure of flow separation. In context of the quasi-2D cases, it was found that PowerFLOW faces some limitations when attempting to match experimental data. This was attributed to an incorrect prediction of flow separation, consequent of using a wall model for resolution of near-wall structures. This issue was more pronounced in the clean cases, where laminar-turbulent transition is critical. The tripping of the boundary layer at the leading edge was also seen to adversely affect the formation of the Dynamic Stall Vortex (DSV). For the 3D cases, it was seen that rotation causes an even greater lift excursion. The cause for this was attributed to the generation of strong spanwise pressure gradients, leading to significant spanwise flow. This spanwise flow was found to be present only in regions where flow separation would be expected in a quasi-2D setup. The findings of this research project helped elaborate on our current understanding of dynamic stall, in addition to highlighting some important technical considerations for LBM-based flow solution using PowerFLOW. This research stands to enable inclusion of more complex physics, and further the capabilities of modern computational fluid…
Advisors/Committee Members: Avallone, Francesco (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: dynamic stall; Wind Turbine Blade; CFD; lattice boltzmann method; rotational augmentation
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APA (6th Edition):
Ballapur Jayasimha, A. (. (2020). An Investigation of Dynamic Stall using a LBM-VLES Approach. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1d92064a-bfe8-4091-a0b5-6246b33ae5b1
Chicago Manual of Style (16th Edition):
Ballapur Jayasimha, Athreya (author). “An Investigation of Dynamic Stall using a LBM-VLES Approach.” 2020. Masters Thesis, Delft University of Technology. Accessed February 25, 2021.
http://resolver.tudelft.nl/uuid:1d92064a-bfe8-4091-a0b5-6246b33ae5b1.
MLA Handbook (7th Edition):
Ballapur Jayasimha, Athreya (author). “An Investigation of Dynamic Stall using a LBM-VLES Approach.” 2020. Web. 25 Feb 2021.
Vancouver:
Ballapur Jayasimha A(. An Investigation of Dynamic Stall using a LBM-VLES Approach. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Feb 25].
Available from: http://resolver.tudelft.nl/uuid:1d92064a-bfe8-4091-a0b5-6246b33ae5b1.
Council of Science Editors:
Ballapur Jayasimha A(. An Investigation of Dynamic Stall using a LBM-VLES Approach. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:1d92064a-bfe8-4091-a0b5-6246b33ae5b1
28.
ZHENG HONGWEI.
Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method.
Degree: 2008, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/12963
Subjects/Keywords: multiphase flow; lattice Boltzmann method
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APA (6th Edition):
HONGWEI, Z. (2008). Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/12963
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
HONGWEI, ZHENG. “Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method.” 2008. Thesis, National University of Singapore. Accessed February 25, 2021.
http://scholarbank.nus.edu.sg/handle/10635/12963.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
HONGWEI, ZHENG. “Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method.” 2008. Web. 25 Feb 2021.
Vancouver:
HONGWEI Z. Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Feb 25].
Available from: http://scholarbank.nus.edu.sg/handle/10635/12963.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
HONGWEI Z. Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/12963
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
QU KUN.
Development of Lattice Boltzmann Method for Compressible Flows.
Degree: 2009, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/15823
Subjects/Keywords: Lattice Boltzmann method; compressible flows
Record Details
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Share »
Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
KUN, Q. (2009). Development of Lattice Boltzmann Method for Compressible Flows. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/15823
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
KUN, QU. “Development of Lattice Boltzmann Method for Compressible Flows.” 2009. Thesis, National University of Singapore. Accessed February 25, 2021.
http://scholarbank.nus.edu.sg/handle/10635/15823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
KUN, QU. “Development of Lattice Boltzmann Method for Compressible Flows.” 2009. Web. 25 Feb 2021.
Vancouver:
KUN Q. Development of Lattice Boltzmann Method for Compressible Flows. [Internet] [Thesis]. National University of Singapore; 2009. [cited 2021 Feb 25].
Available from: http://scholarbank.nus.edu.sg/handle/10635/15823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
KUN Q. Development of Lattice Boltzmann Method for Compressible Flows. [Thesis]. National University of Singapore; 2009. Available from: http://scholarbank.nus.edu.sg/handle/10635/15823
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan Technological University
30.
Chen, Siyu.
NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES.
Degree: PhD, Department of Civil and Environmental Engineering, 2019, Michigan Technological University
URL: https://digitalcommons.mtu.edu/etdr/956
► Water in the asphalt pavement is highly concerning, as it often causes the debonding between asphalt film and aggregate surface or early rutting/fatigue cracking…
(more)
▼ Water in the asphalt pavement is highly concerning, as it often causes the debonding between asphalt film and aggregate surface or early rutting/fatigue cracking because of reduced mix strength. Moisture transport is the processes that occurs when moisture in liquid or vapor state infiltrates the asphalt binder, through the interface of binder-aggregate, and the asphalt mixture.
This dissertation investigated the water permeability of asphalt mixtures in vertical direction, and effect of moisture conditioning on asphalt mixtures. Additionally, relationships between coefficient of permeability, porosity, and air void content of fine-graded hot-mix asphalt were studied. The coefficient of permeability increases as the air void and porosity values increase. After the second moisture conditioning, it was observed that specimens have a reduced porosity and coefficient of permeability.
In addition, this dissertation predicted the coefficient of permeability of asphalt mixtures using the
Lattice Boltzmann Method (LBM). The numerical
method was verified by simulating fluid flow in Poiseuille flow, parallel tubes, and sandstone samples. The experimental results and simulation results were very similar. The LBM can be a powerful tool to understand the fluid flow in asphalt mixtures.
Coefficients of permeability in three different directions (longitudinal, transverse and vertical direction) were also studied. The studied asphalt mixtures were isotropic in two horizontal directions (x- and y- directions) and anisotropic comparing horizontal and vertical directions. The coefficients of permeability in horizontal directions were about two times than that in vertical direction.
Image analysis techniques were used to analyze X-ray CT images of asphalt mixtures and obtain their effective percent air voids, average void diameter, Euler number, degree of anisotropy, specific surface area, and tortuosity. Pearson’s correlation coefficients were used to evaluate the correlation between the selected parameters. The air void content, connected air void, and average void diameter were highly correlated with the coefficients of permeability, which were valuable to understand the fluid flow properties in asphalt mixtures.
Advisors/Committee Members: Zhanping You.
Subjects/Keywords: Asphalt Pavements; Moisture Transport; Permeability; Lattice Boltzmann Method; Anisotropy; Transportation Engineering
Record Details
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Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, S. (2019). NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/956
Chicago Manual of Style (16th Edition):
Chen, Siyu. “NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES.” 2019. Doctoral Dissertation, Michigan Technological University. Accessed February 25, 2021.
https://digitalcommons.mtu.edu/etdr/956.
MLA Handbook (7th Edition):
Chen, Siyu. “NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES.” 2019. Web. 25 Feb 2021.
Vancouver:
Chen S. NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES. [Internet] [Doctoral dissertation]. Michigan Technological University; 2019. [cited 2021 Feb 25].
Available from: https://digitalcommons.mtu.edu/etdr/956.
Council of Science Editors:
Chen S. NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF MOISTURE TRANSPORT IN ASPHALT MIXTURES. [Doctoral Dissertation]. Michigan Technological University; 2019. Available from: https://digitalcommons.mtu.edu/etdr/956
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Open Access Theses and Dissertations
