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Numerical study and acceleration of LBM-RANS simulation of turbulent flow
Shu, Shuli; Yang, Ning
2018
发表期刊CHINESE JOURNAL OF CHEMICAL ENGINEERING
ISSN1004-9541
卷号26期号:1页码:31-42
摘要The coupled models of LBM(Lattice Boltzmann Method) and RANS (Reynolds-Averaged Navier-Stokes) are more practical for the transient simulation of mixing processes at large spatial and temporal scales such as crude oil mixing in large-diameter storage tanks. To keep the efficiency of parallel computation of LBM, the RANS model should also be explicitly solved; whereas to keep the numerical stability the implicit method should be better for RANS model. This article explores the numerical stability of explicit methods in 2D cases on one hand, and on the other hand how to accelerate the computation of the coupled model of LBM and an implicitly solved RANS model in 3D cases. To ensure the numerical stability and meanwhile avoid the use of empirical artificial limitations on turbulent quantities in 2D cases, we investigated the impacts of collision models in LBM (LBGK, MRT) and the numerical schemes for convection terms (WENO, TVD) and production terms (FDM, NEQM) in an explicitly solved standard k-epsilon model. The combination of MRT and TVD or MRT and NEQM can be screened out for the 2D simulation of backward-facing step flow even at Re = 10(7). This scheme combination, however, may still not guarantee the numerical stability in 3D cases and hence much finer grids are required, which is not suitable for the simulation of industrial-scale processes. Then we proposed a new method to accelerate the coupled model of LBM with RANS (implicitly solved). When implemented on multiple GPUs, this new method can achieve 13.5-fold acceleration relative to the original coupled model and 40-fold acceleration compared to the traditional CFD simulation based on Finite Volume (FV) method accelerated by multiple CPUs. This study provides the basis for the transient flow simulation of larger spatial and temporal scales in industrial applications with LBM-RANS methods. (C) 2017 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
关键词Lattice Boltzmann Method Reynolds-averaged Navier-stokes Graphic Processing Units Mixing Transient Simulation
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.cjche.2017.05.013
收录类别SCI
语种英语
关键词[WOS]LATTICE-BOLTZMANN METHOD ; LARGE-EDDY SIMULATIONS ; BACKWARD-FACING STEP ; STIRRED-TANK ; MIXING TIMES ; CFD ; MODELS ; JET ; DENSITY ; BOUSSINESQ
WOS研究方向Engineering
WOS类目Engineering, Chemical
项目资助者National Key Research and Development Program of China(2017YFB0602500) ; National Natural Science Foundation of China(91634203 ; Chinese Academy of Sciences(122111KYSB20150003) ; 91434121)
WOS记录号WOS:000426042000003
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/24049
专题多相复杂系统国家重点实验室
作者单位Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
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Shu, Shuli,Yang, Ning. Numerical study and acceleration of LBM-RANS simulation of turbulent flow[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2018,26(1):31-42.
APA Shu, Shuli,&Yang, Ning.(2018).Numerical study and acceleration of LBM-RANS simulation of turbulent flow.CHINESE JOURNAL OF CHEMICAL ENGINEERING,26(1),31-42.
MLA Shu, Shuli,et al."Numerical study and acceleration of LBM-RANS simulation of turbulent flow".CHINESE JOURNAL OF CHEMICAL ENGINEERING 26.1(2018):31-42.
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