You searched for subject:(Lattice Boltzmann Method).
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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 19, 2020.
http://hdl.handle.net/1911/107701.
MLA Handbook (7th Edition):
Sun, John. “Lattice Boltzmann Simulations of Blunt and Pointed Geometries.” 2019. Web. 19 Feb 2020.
Vancouver:
Sun J. Lattice Boltzmann Simulations of Blunt and Pointed Geometries. [Internet] [Masters thesis]. Rice University; 2019. [cited 2020 Feb 19].
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
University of Southern California
2.
Kwak, Youngmin.
Advanced liquid simulation techniques for computer graphics
applications.
Degree: PhD, Electrical Engineering (Multimedia & Creative
Technology), 2010, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/368016/rec/545
► The particle level set method (PLSM) and the lattice Boltzmann method (LBM) have been two major physics-based liquid simulation techniques used in computer graphics to…
(more)
▼ The particle level set
method (PLSM) and the
lattice
Boltzmann method (LBM) have been two major physics-based liquid
simulation techniques used in computer graphics to generate
splendid and dynamic visual effects. The PLSM suffers from a high
computational cost which arises from the global pressure correction
step whereas the LBM requires a large memory size to store
distribution functions.; In this research, we propose a hybrid
lattice Boltzmann method (HLBM), which integrates the PLSM and the
LBM, to visualize realistic liquid motion with emphasis on the
behavior of the liquid-gas interface. The HLBM first runs the LBM
solver, computes macroscopic velocities, and extrapolates the
velocity field to the gas region. Subsequently, the level set
function and particles are advected by the extrapolated velocity
field, and advected particles are used to correct errors in the
level set function based on the PLSM. Finally, the density
difference between the LBM and the PLSM solvers is added to
distribution functions to correct errors of the LBM. Simulation
results show that the HLBM improves the quality of the fluid
simulation without increasing the number of grids. As compared with
the simulation using the LBM with 503 grids, the mean of the
geometrical distance from the ground truth has been decreased by
21.70% and 13.02% for the water drop and the broken dam
simulations, respectively, using the HLBM with the same number of
grids. The simulation results also show that the HLBM offers more
splashy and dynamic visual effects than the LBM without increasing
the grid size.; Also we propose a multicomponent-multiphase hybrid
lattice Boltzmann method (MCMP-HLBM) which integrates the PLSM and
the MCMP-LBM, to visualize realistic bubble motion with emphasis on
the behavior of the liquid-bubble interface. The MCMP-HLBM first
runs the MCMP-LBM solver and computes composite macroscopic
velocities. Then, the level set function and particles are advected
by the the composite velocity field, and advected particles are
used to correct errors in the level set function based on the PLSM.
Finally, the density difference between the MCMP-LBM and the PLSM
solvers is added to the distribution functions to correct the
errors of the MCMPLBM. We test the
method for the bubble
coalescence and rising simulations. The results show that the
MCMP-HLBM improves the quality of the fluid simulation without
increasing the number of grids. Compared with the simulation using
the MCMP-LBM, the normalized absolute difference from the ground
truth is 61.50% and 36.50% less using the MCMP-HLBM for two
dimensional two- and three-bubble coalescence simulations,
respectively, using the MCMP-HLBM with the same number of grids.
Also the normalized absolute difference from the ground truth using
the MCMP-LBM has been decreased by 44.93%, 56.02%, and 40.62% for
two dimensional single-, two-, and three-bubble rising simulations,
respectively, using the MCMP-HLBM with the same number of grids.
For the case of three dimensional single-, two-, and three-bubble
rising…
Advisors/Committee Members: Kuo, C.-C. Jay (Committee Chair), Mendel, Jerry M. (Committee Member), Nakano, Aiichiro (Committee Member).
Subjects/Keywords: fluid simulation; hybrid lattice Boltzmann method; lattice Boltzmann method; multicomponent multiphase lattice Boltzmann
method; particle level set method
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APA (6th Edition):
Kwak, Y. (2010). Advanced liquid simulation techniques for computer graphics
applications. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/368016/rec/545
Chicago Manual of Style (16th Edition):
Kwak, Youngmin. “Advanced liquid simulation techniques for computer graphics
applications.” 2010. Doctoral Dissertation, University of Southern California. Accessed February 19, 2020.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/368016/rec/545.
MLA Handbook (7th Edition):
Kwak, Youngmin. “Advanced liquid simulation techniques for computer graphics
applications.” 2010. Web. 19 Feb 2020.
Vancouver:
Kwak Y. Advanced liquid simulation techniques for computer graphics
applications. [Internet] [Doctoral dissertation]. University of Southern California; 2010. [cited 2020 Feb 19].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/368016/rec/545.
Council of Science Editors:
Kwak Y. Advanced liquid simulation techniques for computer graphics
applications. [Doctoral Dissertation]. University of Southern California; 2010. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/368016/rec/545
3.
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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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
University of Toledo
4.
Koosukuntla, Narender Reddy.
Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM).
Degree: MS, Mechanical Engineering, 2011, University of Toledo
URL: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321629685
► Lattice Boltzmann Method is evolving as a substitute to the prevalent and predominant CFD modeling especially in cases such as multiphase flows, porous media flows…
(more)
▼ Lattice Boltzmann Method is evolving as a substitute
to the prevalent and predominant CFD modeling especially in cases
such as multiphase flows, porous media flows and micro flows. This
study is aimed at developing simulation model for multiphase flows
for practical applications such as cavitation in a journal bearing
or lubrication of micro contact. The code is first validated
against benchmark single phase flows like Poiseulle flow and flow
over a cylinder. In the process, various boundary conditions like
velocity, pressure, out-flow, no-slip and periodic boundary
conditions are tested. Finally, the Shan-Chen model for multiphase
physics, which is based on the interaction force between the fluid
particles, is incorporated into the code and is
validated.
Advisors/Committee Members: Cioc, Sorin (Advisor).
Subjects/Keywords: Mechanical Engineering; LBM; Lattice Boltzmann Method; CFD
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APA (6th Edition):
Koosukuntla, N. R. (2011). Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM). (Masters Thesis). University of Toledo. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321629685
Chicago Manual of Style (16th Edition):
Koosukuntla, Narender Reddy. “Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM).” 2011. Masters Thesis, University of Toledo. Accessed February 19, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321629685.
MLA Handbook (7th Edition):
Koosukuntla, Narender Reddy. “Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM).” 2011. Web. 19 Feb 2020.
Vancouver:
Koosukuntla NR. Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM). [Internet] [Masters thesis]. University of Toledo; 2011. [cited 2020 Feb 19].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321629685.
Council of Science Editors:
Koosukuntla NR. Towards Development of a Multiphase Simulation Model Using
Lattice Boltzmann Method (LBM). [Masters Thesis]. University of Toledo; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321629685
5.
Bösch, Fabian.
Entropic Lattice Boltzmann Models for Fluid Dynamics.
Degree: 2017, ETH Zürich
URL: http://hdl.handle.net/20.500.11850/183596
► The lattice Boltzmann method (LBM) is a modern and highly successful approach to computational fluid dynamics based on a fully discrete kinetic equation and offers…
(more)
▼ The
lattice Boltzmann method (LBM) is a modern and highly successful approach to computational fluid dynamics based on a fully discrete kinetic equation and offers an attractive alternative to direct discretizations of the macroscopic continuum equations. However, the original single relaxation-time formulation (LBGK) was plagued by numerical instabilities and prevented the simulation of highly turbulent flows unless prohibitively high resolutions were employed. A number of improvements and variations of LBM attempted to alleviate this issue. In particular, the multiple relaxation-times methods (MRT) take advantage of the additional degrees of freedom in the LBM kinetic system in order to stabilize the solution and improve accuracy. However, the introduction of additional tunable constants must be chosen appropriately depending on the physics and the flow at hand and are not universal, and thus, the problem of stability could not be solved consistently.
With the inception of the entropic
lattice Boltzmann method (ELBM) which reintroduced the discrete-time equivalent of
Boltzmann's H-theorem, the application range has grown widely not only for incompressible turbulent flows, but also for thermal flows, two-phase systems with non-ideal equations of state and has made the simulation of compressible and high Mach number flows possible. The ELBM, however, comes at the price of introducing a fluctuating viscosity.
The main result of this thesis is the development of a new class of entropic MRT models which combine the salient advantages from MRT and ELBM while trying to circumvent their respective disadvantages. J. W. Gibbs' seminal prescription for constructing optimal states by maximizing the entropy under pertinent constraints is used to derive a novel
lattice kinetic theory and the the notion of modifying the viscosity to stabilize sub-grid simulations is challenged in this kinetic framework. By exploiting the degrees of freedom of MRT and by compliance to the discrete-time H-theorem, the advantages of both MRT and ELBM can be retained and the problems of parameter tuning and fluctuating viscosity can be solved. The resulting models are accurate, adaptive, parameter-free, efficient and, more importantly, very stable
The entropic MRT models are studied extensively for two- and three- dimensional benchmark simulations at turbulent conditions and compared to experiments, theory and other numerical methods. While the entropic MRT models yield the same results as the LBGK in the resolved limit, and converge towards the Navier-Stokes equations with second-order accuracy, sufficiently accurate results are obtained also at coarse resolutions without the use of sub-grid turbulence models. This made the simulation of high Reynolds number flows with complex boundaries possible which are most relevant for engineering applications.
Due to the general nature of the entropic MRT methods, a number of extensions beyond the incompressible low Mach number regimes were explored and extensions for thermal flows and two-phase flows are…
Advisors/Committee Members: Karlin, Iliya V., Chikatamarla, Shyam S., Succi, Sauro, Jenny, Patrick.
Subjects/Keywords: Lattice Boltzmann method; Fluid dynamics; kinetic theory
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APA (6th Edition):
Bösch, F. (2017). Entropic Lattice Boltzmann Models for Fluid Dynamics. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/183596
Chicago Manual of Style (16th Edition):
Bösch, Fabian. “Entropic Lattice Boltzmann Models for Fluid Dynamics.” 2017. Doctoral Dissertation, ETH Zürich. Accessed February 19, 2020.
http://hdl.handle.net/20.500.11850/183596.
MLA Handbook (7th Edition):
Bösch, Fabian. “Entropic Lattice Boltzmann Models for Fluid Dynamics.” 2017. Web. 19 Feb 2020.
Vancouver:
Bösch F. Entropic Lattice Boltzmann Models for Fluid Dynamics. [Internet] [Doctoral dissertation]. ETH Zürich; 2017. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/20.500.11850/183596.
Council of Science Editors:
Bösch F. Entropic Lattice Boltzmann Models for Fluid Dynamics. [Doctoral Dissertation]. ETH Zürich; 2017. Available from: http://hdl.handle.net/20.500.11850/183596
University of Edinburgh
6.
Nash, Rupert William.
Efficient lattice Boltzmann simulations of self-propelled particles with singular forces.
Degree: PhD, 2010, University of Edinburgh
URL: http://hdl.handle.net/1842/4143
► The motion of microorganisms presents interesting and diffcult problems ranging from mechanisms of propulsion to collective effects. Experimentally, some of the complicating factors, such as…
(more)
▼ The motion of microorganisms presents interesting and diffcult problems ranging from mechanisms of propulsion to collective effects. Experimentally, some of the complicating factors, such as death, reproduction, chemotaxis, etc., can be suppressed through genetic manipulation or environmental control. Nonequilibrium statistical mechanics has been used to study simple models, however proceeding analytically is extremely challenging. Thus simulations, where one has total control over and knowledge of the system, are a compelling method for examining models of their behaviour. In this work I present simulations of minimal, self-propelled particles, while ensuring realistic hydrodynamic behaviour using the lattice Boltzmann method (LBM), a well-studied method for simulating fluid flows that scales linearly in computational effort with the system volume. The derivation of the LBM is reviewed, including the addition of forces in a consistent, accurate
manner as well as thermal fluctuations that satisfy the fluctuation-dissipation theorem. It is extended to include singular forces via a regularization of the Dirac δ-function. This is implemented and extensively tested for agreement with low Reynolds number hydrodynamics. The regularized singularities are used to develop an effcient algorithm for pointlike particles which move under the influence of an external force, such as gravity, or thermal fluctuations of the fluid. The method is compared to theoretical results and simulations using a well-studied algorithm that resolves the particle, finding good agreement in the dilute limit and significantly reduced computational requirements. Using the singular forces, we then construct a minimal model for self-propelled particles, that may also experience forces or undergo random changes of orientation (modelling the “run-and-tumble” dynamics observed in swimming bacteria such as E. coli). The collective behaviour of these model swimmers
is studied in three situations: sedimentation under gravity; in a central, harmonic trap; and in a Poiseuille flow between parallel plates. For sedimentation, the behaviour is not very different from that expected of non-interacting run-and-tumble particles, except that total collapse to the container bottomwhen the weight of the particles equals the propelling force is prevented by the velocity fluctuations caused by the particles’ activity. The trapped particles, for runlengths comparable to the trap size, self-assemble into a pump-like structure, while for short run-lengths an approximately Gaussian distribution seenwithout hydrodynamic interactions, is maintained. In Poiseuille flows we find the particles orient upstream; forweak flows this results in a net upstreamcurrent. We find significant hydrodynamic effects, in the dilute limit, only when there is some mechanism that causes alignment of the particles.
Subjects/Keywords: 518; microorganisms; motion; lattice Boltzmann method; fluid
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APA (6th Edition):
Nash, R. W. (2010). Efficient lattice Boltzmann simulations of self-propelled particles with singular forces. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/4143
Chicago Manual of Style (16th Edition):
Nash, Rupert William. “Efficient lattice Boltzmann simulations of self-propelled particles with singular forces.” 2010. Doctoral Dissertation, University of Edinburgh. Accessed February 19, 2020.
http://hdl.handle.net/1842/4143.
MLA Handbook (7th Edition):
Nash, Rupert William. “Efficient lattice Boltzmann simulations of self-propelled particles with singular forces.” 2010. Web. 19 Feb 2020.
Vancouver:
Nash RW. Efficient lattice Boltzmann simulations of self-propelled particles with singular forces. [Internet] [Doctoral dissertation]. University of Edinburgh; 2010. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/1842/4143.
Council of Science Editors:
Nash RW. Efficient lattice Boltzmann simulations of self-propelled particles with singular forces. [Doctoral Dissertation]. University of Edinburgh; 2010. Available from: http://hdl.handle.net/1842/4143
Queens University
7.
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 (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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Bespalko DJ. Validation of the Lattice Boltzmann Method for Direct Numerical Simulation of Wall-Bounded Turbulent Flows
. [Internet] [Thesis]. Queens University; 2011. [cited 2020 Feb 19].
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
NSYSU
8.
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 (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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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
9.
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 ·
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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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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
Texas A&M University
10.
Kang, Shin Kyu.
Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.
Degree: 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 (6th Edition):
Kang, S. K. (2012). Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710
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):
Kang, Shin Kyu. “Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.” 2012. Thesis, Texas A&M University. Accessed February 19, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kang, Shin Kyu. “Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation.” 2012. Web. 19 Feb 2020.
Vancouver:
Kang SK. Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kang SK. Immersed Boundary Methods in the Lattice Boltzmann Equation for Flow Simulation. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8710
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Moon J. Rheological Behavior of Complex Fluid with Deformable and Rigid Particles
. [Internet] [Thesis]. University of Sydney; 2017. [cited 2020 Feb 19].
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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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 ·
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MLA ·
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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 19, 2020.
https://era.library.ualberta.ca/files/x920fz543.
MLA Handbook (7th Edition):
Shardt, Orest. “Simulations of Droplet Interactions with Lattice Boltzmann
Methods.” 2014. Web. 19 Feb 2020.
Vancouver:
Shardt O. Simulations of Droplet Interactions with Lattice Boltzmann
Methods. [Internet] [Doctoral dissertation]. University of Alberta; 2014. [cited 2020 Feb 19].
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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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 ·
Chicago ·
MLA ·
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CSE |
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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 19, 2020.
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. 19 Feb 2020.
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 2020 Feb 19].
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
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
O'Connor JM. Fluid-Structure Interactions of Wall-Mounted Flexible
Slender Structures. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2020 Feb 19].
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.
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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Share »
Record Details
Similar Records
Cite
« Share
❌
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Owen B. Development of a discrete fluid-structure interaction method for cardiovascular applications. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2020 Feb 19].
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
18.
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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Share »
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Owen BJ. Development of a discrete fluid-structure interaction
method for cardiovascular applications. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2020 Feb 19].
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
University of Manchester
19.
O'Connor, Joseph.
Fluid-structure interactions of wall-mounted flexible slender structures.
Degree: PhD, 2018, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.764589
► 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.
Subjects/Keywords: immersed boundary method; lattice Boltzmann method; finite element method; fluid-structure interaction; flexible slender structures
Record Details
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Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
O'Connor, J. (2018). Fluid-structure interactions of wall-mounted flexible slender structures. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.764589
Chicago Manual of Style (16th Edition):
O'Connor, Joseph. “Fluid-structure interactions of wall-mounted flexible slender structures.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 19, 2020.
https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.764589.
MLA Handbook (7th Edition):
O'Connor, Joseph. “Fluid-structure interactions of wall-mounted flexible slender structures.” 2018. Web. 19 Feb 2020.
Vancouver:
O'Connor J. Fluid-structure interactions of wall-mounted flexible slender structures. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2020 Feb 19].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.764589.
Council of Science Editors:
O'Connor J. Fluid-structure interactions of wall-mounted flexible slender structures. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.764589
University of Utah
20.
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Erickson LC. Blood flow dynamics: a lattice Boltzmann-Immersed boundary approach. [Internet] [Doctoral dissertation]. University of Utah; 2010. [cited 2020 Feb 19].
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
21.
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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Chicago ·
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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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Wasylkiewicz MJ. Simulations of Liquid Spreading and Particle Aggregation in
Gas-Fluidized Beds. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2020 Feb 19].
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
Texas A&M University
22.
Karra, Satish.
Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1347
► In the recent years, researchers have discovered a multitude of applications using nanofibers in fields like composites, biotechnology, environmental engineering, defense, optics and electronics. This…
(more)
▼ In the recent years, researchers have discovered a multitude of applications
using nanofibers in fields like composites, biotechnology, environmental engineering,
defense, optics and electronics. This increase in nanofiber applications needs
a higher rate of nanofiber production. Electrospinning has proven to be the best
nanofiber manufacturing process because of simplicity and material compatibility.
Study of effects of various electrospinning parameters is important to improve the
rate of nanofiber processing. In addition, several applications demand well-oriented
nanofibers. Researchers have experimentally tried to control the nanofibers using
secondary external electric field. In the first study, the electrospinning process is
modeled and the bending instability of a viscoelastic jet is simulated. For this, the
existing discrete bead model is modified and the results are compared, qualitatively,
with previous works in literature. In this study, an attempt is also made to simulate
the effect of secondary electric field on electrospinning process and whipping instability.
It is observed that the external secondary field unwinds the jet spirals, reduces
the whipping instability and increases the tension in the fiber.
Lattice Boltzmann method (LBM) has gained popularity in the past decade as
the
method is easy implement and can also be parallelized. In the second part of this
thesis, a hybrid numerical scheme which couples
lattice Boltzmann method with finite
difference
method for a Oldroyd-B viscoelastic solution is proposed. In this scheme,
the polymer viscoelastic stress tensor is included in the equilibrium distribution function
and the distribution function is updated using SRT-LBE model. Then, the local
velocities from the distribution function are evaluated. These local velocities are used
to evaluate local velocity gradients using a central difference
method in space. Next,
a forward difference scheme in time is used on the Maxwell Upper Convected model
and the viscoelastic stress tensor is updated. Finally, using the proposed numerical
method start-up Couette flow problem for Re = 0.5 and We = 1.1, is simulated. The
velocity and stress results from these simulations agree very well with the analytical
solutions.
Advisors/Committee Members: Girimaji, Sharath (advisor), Srinivasa, Arun R. (advisor), Anand, Nagamangala K. (committee member).
Subjects/Keywords: Electrospinning; lattice Boltzmann method; Viscoelastic fluid; Oldroyd-B
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APA (6th Edition):
Karra, S. (2009). Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1347
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):
Karra, Satish. “Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows.” 2009. Thesis, Texas A&M University. Accessed February 19, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-1347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karra, Satish. “Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows.” 2009. Web. 19 Feb 2020.
Vancouver:
Karra S. Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karra S. Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1347
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
23.
O'Brien, Patrick Michael.
A framework for digital watercolor.
Degree: 2008, Texas A&M University
URL: http://hdl.handle.net/1969.1/86068
► This research develops an extendible framework for reproducing watercolor in a digital environment, with a focus on interactivity using the GPU. The framework uses the…
(more)
▼ This research develops an extendible framework for reproducing watercolor in a digital
environment, with a focus on interactivity using the GPU. The framework uses the
lattice Boltzmann method, a relatively new approach to fluid dynamics, and the
Kubelka-Munk reflectance model to capture the optical properties of watercolor. The
work is demonstrated through several paintings produced using the system.
Advisors/Committee Members: House, Donald (advisor), Davison, Richard (committee member), Keyser, John (committee member).
Subjects/Keywords: Watercolor; lattice Boltzmann method; fluid simulation; kubelka-munk
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Manager
APA (6th Edition):
O'Brien, P. M. (2008). A framework for digital watercolor. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/86068
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):
O'Brien, Patrick Michael. “A framework for digital watercolor.” 2008. Thesis, Texas A&M University. Accessed February 19, 2020.
http://hdl.handle.net/1969.1/86068.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
O'Brien, Patrick Michael. “A framework for digital watercolor.” 2008. Web. 19 Feb 2020.
Vancouver:
O'Brien PM. A framework for digital watercolor. [Internet] [Thesis]. Texas A&M University; 2008. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/1969.1/86068.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
O'Brien PM. A framework for digital watercolor. [Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/86068
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Southern California
24.
Jung, Sewoong.
A Boltzmann model for tracking aerosols in turbulent
flows.
Degree: PhD, Aerospace and Mechanical Engineering (Computational
Fluid and Solid Mechanics), 2013, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/130134/rec/56
► The transport and deposition of inertial particles in unsteady flows were investigated using a novel computationally inexpensive particle tracking model. The flows are simulated using…
(more)
▼ The transport and deposition of inertial particles in
unsteady flows were investigated using a novel computationally
inexpensive particle tracking model. The flows are simulated using
lattice Boltzmann methods, which evolve until computationally
steady flows are obtained. Initially, a snapshot of the flow is
stored, and the trajectories of particles are computed through the
flow domain under the influence of this static probability field.
Although the flow is not computationally evolving during the
particle tracking simulation, the local velocity is obtained
stochastically from the local probability function, thus allowing
the dynamics of the turbulent flow to be resolved from the point of
view of the suspended particles. Particle inertia is modeled by
using a relaxation parameter based on the particle Stokes number
that allows for a particle velocity history to be incorporated
during each time step. Computational simulation of particle-laden
flows in a square cylinder placed in a 2D channel flow having
Reynolds number of Re = 1000 was performed. Particles having Stokes
number greater than unity were not affected by the flow in the wake
region, while particles with smaller Stokes numbers (St < 1)
interact strongly with the wake vortices. The computed particle
deposition on the front side of the cylinder compared well with
previous numerical results. The deposition efficiency decreases
with decreasing Stokes number, typical of an inertial impaction
process. The static probability model was also applied for tracking
inertial particles through a turbulent square duct flow having a
friction Reynolds number of Reτ = 300. Wall deposition rates and
deposition patterns were obtained and exhibited a high level of
agreement with previously obtained DNS computational results and
experimental results for a wide range of particle inertia. This
Boltzmann-based mode, which computes inertial particle motion from
the local fluid probability distribution function, was parallelized
efficiently using a GPU architecture, allowing for a turbulent
square duct simulation that allows the fluid probability field to
evolve during the particle tracking simulation. The computation
time of the inertial particle tracking in the evolving
three-dimensional turbulent duct flow is 134 times faster than
using sequential computation on a CPU. Extremely good agreement was
found between the static probability field simulation and the
evolving probability field simulation. These results suggest that
accurate particle tracking through complex turbulent flows may be
feasible given a suitable probability field, such as one obtained
from a
lattice Boltzmann simulation. This in turn presents a new
paradigm for the rapid acquisition of particle transport statistics
without the need for concurrent computations of fluid flow
evolution.
Advisors/Committee Members: Phares, Denis J. (Committee Chair), Kassner, Michael E. (Committee Member), Henry, Ronald C. (Committee Member).
Subjects/Keywords: Lattice Boltzmann method; aerosols; computational fluid dynamics; turbulent flows
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jung, S. (2013). A Boltzmann model for tracking aerosols in turbulent
flows. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/130134/rec/56
Chicago Manual of Style (16th Edition):
Jung, Sewoong. “A Boltzmann model for tracking aerosols in turbulent
flows.” 2013. Doctoral Dissertation, University of Southern California. Accessed February 19, 2020.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/130134/rec/56.
MLA Handbook (7th Edition):
Jung, Sewoong. “A Boltzmann model for tracking aerosols in turbulent
flows.” 2013. Web. 19 Feb 2020.
Vancouver:
Jung S. A Boltzmann model for tracking aerosols in turbulent
flows. [Internet] [Doctoral dissertation]. University of Southern California; 2013. [cited 2020 Feb 19].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/130134/rec/56.
Council of Science Editors:
Jung S. A Boltzmann model for tracking aerosols in turbulent
flows. [Doctoral Dissertation]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/130134/rec/56
The Ohio State University
25.
Yu, Zhao.
A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows.
Degree: PhD, Chemical Engineering, 2009, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1259466323
► Multiphase flows involving bubbles and droplets are ubiquitous in nature and in many industrial processes. Detailed information of such flows can be acquired from…
(more)
▼ Multiphase flows involving bubbles and
droplets are ubiquitous in nature and in many industrial processes.
Detailed information of such flows can be acquired from direct
numerical simulations that directly resolve the flow on the bubble
or droplet scale. In recent years, the
lattice Boltzmann method
(LBM) has emerged as a novel numerical
method for multiphase flow
simulation. While having many favorable features such as
incorporation of physics on the more fundamental level and
efficient algorithm for fast computation, the current multiphase
LBM still faces challenges in issues such as numerical instability
and narrow parameter window, which severely restrict its
application in a broad range of real world engineering
problems. This dissertation presents the
development of a novel multiphase LBM which significantly expands
the application of the
method in various flow problems.
Specifically, three techniques are developed to achieve enhanced
performance in three aspects: First, new interaction potential
functions are developed for multi-component LBM model to improve
numerical stability at high density ratios between the liquid and
gas phase. Second, an adaptive mesh refinement (AMR) scheme is
developed to provide sufficient resolution of the gas-liquid
interface. Third, the multi-relaxation time (MRT) scheme is
incorporated into the interaction potential model to enhance the
numerical stability at low viscosities. The above new techniques
are presented in detail, and simulations are performed in both 2D
and 3D to evaluate their performance. It is demonstrated that the
new interaction potential model is able to raise the stable density
ratio from below 50 to over 1000. The AMR can provide accurate
predictions of the interface, while reduce the computation cost by
about 50% in real computations. In addition, with the MRT algorithm
the maximum Reynolds number in bubble simulations can be increased
from 100 to about 1000. The performance of the
newly developed LBM technique is further illustrated in different
applications. In the study of the buoyant rise of a gas bubble in a
viscous liquid, simulations are carried out to investigate the
shape and rise velocity of the bubble. Particularly, both bubbles
with large deformation and bubbles with high Reynolds number are
studied. Good agreement is found between the model predictions and
experimental results in the literature. Then the collision between
a liquid droplet and a porous surface is investigated. Using the
adaptive mesh approach, the flows on both the droplet scale and the
pore scale are direct resolved simultaneously. The deformation of
the droplet on the porous surfaces is compared to that on
impermeable surfaces. Finally, the LBM simulation is performed for
bubble formation in microchannels. The bubble shape and formation
mechanism are discussed in different regimes and compared with
experimental results. In summary, a systematic
investigation is conducted to improve the stability and accuracy of
the LBM for multiphase simulations. A novel…
Advisors/Committee Members: Fan, Liang-Shih (Advisor).
Subjects/Keywords: Chemical Engineering; Multiphase flow; Lattice Boltzmann Method; Numerical simulation; bubble; droplet
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yu, Z. (2009). A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1259466323
Chicago Manual of Style (16th Edition):
Yu, Zhao. “A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows.” 2009. Doctoral Dissertation, The Ohio State University. Accessed February 19, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1259466323.
MLA Handbook (7th Edition):
Yu, Zhao. “A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows.” 2009. Web. 19 Feb 2020.
Vancouver:
Yu Z. A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows. [Internet] [Doctoral dissertation]. The Ohio State University; 2009. [cited 2020 Feb 19].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1259466323.
Council of Science Editors:
Yu Z. A Novel Lattice Boltzmann Method for Direct Numerical
Simulation of Multiphase Flows. [Doctoral Dissertation]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1259466323
NSYSU
26.
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 ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
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 19, 2020.
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. 19 Feb 2020.
Vancouver:
Ho Y. 3-D lattice Boltzmann simulations of the free convection above a heated horizontal cylinder. [Internet] [Thesis]. NSYSU; 2015. [cited 2020 Feb 19].
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
Louisiana State University
27.
Zhu, Zhipeng.
Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method.
Degree: MSPE, Petroleum Engineering, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_theses/4650
► Interfacial instabilities occur often during immiscible fluid flow through porous media and their understanding is essential for waterflooding operations or other oil recovery processes.…
(more)
▼ Interfacial instabilities occur often during immiscible fluid flow through porous media and their understanding is essential for waterflooding operations or other oil recovery processes. Although many studies including experimental and numerical have been done to reproduce and analyze the interfacial instabilities in porous median, there is still significant knowledge gap in fundamental understanding of these flow instabilities at the pore-scale. In order to better understand the interfacial instabilities phenomenon, the pore-scale simulations are performed. In this study, Lattice Boltzmann Method is used to simulate two different types of interfacial instabilities: viscous fingering and capillary fingering in irregular sphere packs by changing the viscosity ratio of the displacing and displaced fluid to achieve different force balances. A distinct feature of viscous fingering at the pore scale is that the wetting phase mostly flows through the pore space such that a sharp interface between immiscible fluids in pore space is observed while it sporadically moves along the grain surface. In contrast during the capillary fingering instabilities, the wetting phase moves mainly along the grain surface. Further, the fluid flow paths during different instabilities can be significantly different even in the same porous medium. Also, the effective relative permeability is calculated while accounting for heterogeneity in the porous media. Based on the simulation results it was concluded that heterogeneity in porous media will in general lower relative permeability of wetting phase during the imbibition process but may not significantly influence the non-wetting phase relative permeability.
Subjects/Keywords: pore-scale; multiphase; interface; relative permeability. lattice Boltzmann method; water flooding
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APA ·
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MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhu, Z. (2018). Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method. (Masters Thesis). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_theses/4650
Chicago Manual of Style (16th Edition):
Zhu, Zhipeng. “Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method.” 2018. Masters Thesis, Louisiana State University. Accessed February 19, 2020.
https://digitalcommons.lsu.edu/gradschool_theses/4650.
MLA Handbook (7th Edition):
Zhu, Zhipeng. “Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method.” 2018. Web. 19 Feb 2020.
Vancouver:
Zhu Z. Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method. [Internet] [Masters thesis]. Louisiana State University; 2018. [cited 2020 Feb 19].
Available from: https://digitalcommons.lsu.edu/gradschool_theses/4650.
Council of Science Editors:
Zhu Z. Pore-Scale Analysis of Interfacial Instabilities and Impact of Heterogeneity on Relative Permeability by Lattice Boltzmann Method. [Masters Thesis]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_theses/4650
Virginia Tech
28.
Kestell, Gayle M.
Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method.
Degree: MS, Mechanical Engineering, 2010, Virginia Tech
URL: http://hdl.handle.net/10919/41286
► The metallic interconnect of a solid oxide fuel cell (SOFC) contains chromium in order to protect the metal from the corrosive environment in the fuel…
(more)
▼ The metallic interconnect of a solid oxide fuel cell (SOFC) contains chromium in order to protect the metal from the corrosive environment in the fuel cell. Unfortunately, the chromium introduces chemical instability in the cathode as it migrates from the interconnect to the pores in the cathode. A model was developed previously in Asinari et al. [1] and Kasula et al [2] to model the flow of particles in a fuel cell electrode. To learn more about the migration of the chromium, the previous code is modified in this thesis work to include the effects of the chromium. The model uses Kinetic Theory to simulate the fuel cell at a mesoscopic scale. The discretized form of the
Lattice Boltzmann equation is modified for enhanced performance and for use on a parallel processing system.
With the new model, the migration of the chromium in the cathode and the performance degradation of the fuel cell are predicted.
Advisors/Committee Members: von Spakovsky, Michael R. (committeechair), Reynolds, William T. Jr. (committee member), Lu, P. Kathy (committee member), Ellis, Michael W. (committee member).
Subjects/Keywords: chromium poisoning; Kinetic Theory; Lattice Boltzmann Method; SOFC; Fuel Cell
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APA (6th Edition):
Kestell, G. M. (2010). Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/41286
Chicago Manual of Style (16th Edition):
Kestell, Gayle M. “Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method.” 2010. Masters Thesis, Virginia Tech. Accessed February 19, 2020.
http://hdl.handle.net/10919/41286.
MLA Handbook (7th Edition):
Kestell, Gayle M. “Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method.” 2010. Web. 19 Feb 2020.
Vancouver:
Kestell GM. Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2020 Feb 19].
Available from: http://hdl.handle.net/10919/41286.
Council of Science Editors:
Kestell GM. Model of chromium poisoning in the cathode of a solid oxide fuel cell using the lattice Boltzmann method. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/41286
29.
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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Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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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 19, 2020.
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. 19 Feb 2020.
Vancouver:
HONGWEI Z. Simulation of multiphase and Multi-component Flows by Lattice Boltzmann Method. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2020 Feb 19].
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
30.
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
Cite
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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 19, 2020.
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. 19 Feb 2020.
Vancouver:
KUN Q. Development of Lattice Boltzmann Method for Compressible Flows. [Internet] [Thesis]. National University of Singapore; 2009. [cited 2020 Feb 19].
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
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Open Access Theses and Dissertations
