Validation and verification of a 2D lattice Boltzmann solver for incompressible fluid flow

Tamás István Józsa, Máté Szőke, Tom-Robin Teschner, László Könözsy, Irene Moulitsas

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Abstract

The lattice Boltzmann method (LBM) is becoming increasingly popular in the fluid mechanics society because it provides a relatively easy implementation for an incompressible fluid flow solver. Furthermore the particle based LBM can be applied in microscale flows where the continuum based Navier-Stokes solvers fail. Here we present the validation and verification of a two-dimensional in-house lattice Boltzmann solver with two different collision models, namely the BGKW and the MRT models [1]. Five different cases were studied, namely: (i) a channel flow was investigated, the results were compared to the analytical solution, and the convergence properties of the collision models were determined; (ii) the lid-driven cavity problem was examined [2] and the flow features and the velocity profiles were compared to existing simulation results at three different Reynolds number; (iii) the flow in a backwardfacing step geometry was validated against experimental data [3]; (iv) the flow in a sudden expansion
geometry was compared to experimental data at two different Reynolds numbers [4]; and finally (v) the flow around a cylinder was studied at higher Reynolds number in the turbulent regime. The first four test cases showed that both the BGKW and the MRT models were capable of giving qualitatively and quantitatively good results for these laminar flow cases. The simulations around a cylinder highlighted that the BGKW model becomes unstable for high Reynolds numbers but the MRT model still remains suitable to capture the turbulent von Karm´ an vortex street. The in-house LBM code has been developed in C and has also been parallelised for GPU architectures using CUDA [5] and for CPU architectures
using the Partitioned Global Address Space model with UPC [6].
Original languageEnglish
Title of host publicationVII European Congress on Computational Methods in Applied Sciences and Engineering
Subtitle of host publicationproceedings
Pages1046-1060
Number of pages15
Volume1
ISBN (Electronic)9786188284401
Publication statusPublished - Jun 2016
EventEuropean Congress on Computational Methods in Applied Sciences and Engineering - Crete Island, Greece
Duration: 5 Jun 201610 Jun 2016

Conference

ConferenceEuropean Congress on Computational Methods in Applied Sciences and Engineering
CountryGreece
CityCrete Island
Period5/06/1610/06/16

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