Numerical study and acceleration of LBM-RANS simulation of turbulent flow

Shuli Shu; Ning Yang

doi:10.1016/j.cjche.2017.05.013

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Numerical study and acceleration of LBM-RANS simulation of turbulent flow

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Numerical study and acceleration of LBM-RANS simulation of turbulent flow
- Chinese Journal of Chemical Engineering Vol. 26, Issue 1, Pages: 31-42(2018)
- Affiliations：
  
  State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing,China,100190
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.05.013
  CLC：
- Published：2018
- Accepted：
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Shuli Shu, Ning Yang. Numerical study and acceleration of LBM-RANS simulation of turbulent flow[J]. Chin.J.Chem.Eng., 2018, 26(1): 31-42.
DOI：

Shuli Shu, Ning Yang. Numerical study and acceleration of LBM-RANS simulation of turbulent flow[J]. Chin.J.Chem.Eng., 2018, 26(1): 31-42. DOI： 10.1016/j.cjche.2017.05.013.

摘要

Abstract

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-ε 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

. This scheme combination

however

may still not guarantee the n

umerical 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.

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