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Questions tagged [lattice-boltzmann-methods]

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Lattice Boltzmann method parallelization

I'm learning about the lattice Boltzmann method (LBM) and how it can be parallelized. On Wikipedia, they say, "The LBM was designed from scratch to run efficiently on massively parallel ...
Medulla Oblongata's user avatar
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3D turbulent divergence free initial velocity field

I'm trying to build a DNS so simulate non-Newtonian turbulent channel flow using the Lattice Boltzmann Method. Most of the papers I use initialise the system using the analytical solution of the ...
DvB's user avatar
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Lattice Boltzmann methods beyond BGK-style collision operators

I am trying to educate myself on the lattice Boltzmann method to see if it may be useful for simulating some problems in plasma physics that I am interested in. One thing that strikes me is the (...
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Methodology to develop parallel GPU simulations

I'm quite new to GPU or in general parallel programming. I am working on a Lattice-Boltzmann simulation that should be parallelized on GPU's. I wanted to asked more experienced people how to attack ...
enco909's user avatar
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Is it possible to shift the numerical results in order to compare it with the analytical solution?

I'm using lattice Boltzmann method (LBM) to do simulation of flow in a pipe. The diameter of the pipe is 0.02 m and its height is 0.1 m. I put a parabolic velocity profile at the inlet: $$\mathbf{u}(\...
Mithridates the Great's user avatar
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Understading memory sharing in a GPGPU using a lattice example

I am new in the GPUs world, I used them in Matlab ambient so I didn't need to appreciate the subtleties of these devices. I know that a GPU can be divided into multiprocessors (also called Streaming ...
Siderius's user avatar
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Choosing good modelling method for solving Boltzmann equation

I'm writing a solver for Boltzmann Equations (BE) including a force term in rarefied plasma, for my PhD. The aim is to see if an instability occurs inside an electric streamer (theoretically it should,...
Paweł J's user avatar
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2 answers
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Why lattice Boltzmann despite its huge number of mesh points still has worse accuracy in comparison to FEM for calculating wall shear stress?

I'm just doing a very simple experiment. I'm calculating wall shear stress based on Poiseuille flow for a pipe by using lattice Boltzmann method (LBM) and FEM to compare their values with the ...
Mithridates the Great's user avatar
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What is the correct way to calculate deviatoric stress tensor in lattice Boltzmann method?

Due to my previous question, where I asked about flux calculation in lattice Boltzmann (LB) method here, I have more or less same question for deviatoric stress tensor calculation due to pseudo-...
Mithridates the Great's user avatar
4 votes
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How to deal with pseudo-compressibility of lattice Boltzmann method when you are calculating mass flux?

In lattice Boltzmann method, we have a concept, which is called pseudo-compressibility and it is defined based on the fact that LBM simulates incompressible flows by having small Mach number to ensure ...
Mithridates the Great's user avatar
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Why wall shear stress calculated from LBM directly and the one calculated based on velocity profile are so different in some cases?

First of all, I hope you accept my apologizes if my question seems off topic here. But, I asked this question in ParaView forum and after a week still I did not receive any response yet, so I'm ...
Mithridates the Great's user avatar
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Lattice Boltzmann methods vs Navier stokes/ other eulerian methods for *water* simulation

Note, there is already a question here, however the answers don't answer the original question, let alone specific considerations when dealing with nearly in-compressible fluids (water). Another ...
Krupip's user avatar
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Instability in Lattice Boltzmann Solver

I wrote a Lattice Boltzmann Solver in Rust a little while back using both the BGK approximation and the TRT (two relaxation time) method on the D2Q9 lattice. In both cases I run into major stability ...
taktoa's user avatar
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Combining fluid flow solver based on lattice Boltzmann method with a mechanical deformation solver based on finite element method

I'm thinking to couple my fluid flow solver based on lattice Boltzmann method with a mechanical deformation solver based on finite element method to take account for solid deformation in my models. In ...
GGG's user avatar
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Derive total energy balance equation from Chapman-Enskog analysis of lattice Boltzmann equation

I'm interested to derive the total energy balance from Chapman-Enskog analysis of lattice Boltzmann equation (LBE). I know, I should go to the second moment of LBE (zeroth moment gives mass ...
GGG's user avatar
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How to choose the relaxation time in the Lattice Boltzmann Method?

We know that the relaxation time is very important in LBM. I have searched lost of papers, but can't find some systematic introductions about the choice of relaxation time in SRT LBM. Could you give ...
Particle's user avatar
1 vote
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322 views

Flow past square cylinder benchmark in 2D. Famous papers to compare

I'm looking for a benchmark for the flow past square cylinder problem in 2D to compare my results. I have found some papers, but it seems that there are different results in different papers. I want ...
Particle's user avatar
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Mesh and Lattice-Boltzmann methods

I have a pretty basic question about Lattice-Boltzmann methods. I heard that this is a meshless simulation method. How do you account for obstacles and boundaries in a Lattice-Boltzmann code. Does it ...
H.C. Lefevre's user avatar
1 vote
2 answers
1k views

Outlet boundary conditions in lattice Boltzmann method

Here is the flow past a square cylinder configuration. The problem is a viscous and incompressible with parabolic velocity profile using freestream velocity $U$ across a single cylinder. I use the ...
Particle's user avatar
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1 answer
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Explain step in Lattice Boltzmann method

Actually I am reading a book about the Lattice Boltzmann methods, and here is a quotation: After introducing BGKW approximation, the Boltzmann equation (without external forces) can be approximated ...
Navaro's user avatar
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New to CFD, Lattice Boltzmann or Navier-Stokes?

I apologize if some of my questions are naive; I am very new to computer simulations and fluid-dynamics. I am going to start a PhD in early 2017, and I would like to bone-up on some Computational ...
user109527's user avatar
2 votes
1 answer
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Definitiones of solid, fluid, and boundary nodes in the context of LBM

In the family of Lattice Boltzmann (LB) methods, like many others, one deals with three types of node; namely, fluid node, solid node, and boundary node. (I know; the boundary node is a subtype of ...
Shaqpad's user avatar
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2 votes
1 answer
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Introduction to Lattice Boltzmann methods [closed]

I am trying to learn the Lattice-Boltzmann method and was looking for some good beginner resources explaining the method. I have been looking at some codes online, but have been having trouble ...
chaitu's user avatar
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