Multi-component LBM-LES model of the air and methane flow in tunnels and its validation

Chengwu Li, Yuechao Zhao, Dihao Ai, Qifei Wang, Zhigao Peng and Yingjun Li

Physica A: Statistical Mechanics and its Applications, 2020, vol. 553, issue C

Abstract: A model based on multi-component Lattice Boltzmann Method (LBM) coupled with Large Eddy Simulation (LES) is developed to simulate the methane and air behavior in tunnels. The results of the LBM-LES model are compared with the results of four other turbulence models calculated by FLUENT: K-EPSILON model, K-OMEGA model, REYNOLD STRESS model, and SPALLART ALMARAS model. The differences in the calculation results between them are analyzed. A reduced-scale tracer gas experiment is designed to validate the LBM model. It demonstrates that the LBM model obtains the approximate results with the other turbulence models but they have differences in detail. The reasons of the differences between them are that the boundary layer calculated by the LBM model is thicker than other turbulence models, and the LBM model is not an incompressible model and it is a weakly compressible model. The results of the LBM model agree well with the experimental results.

Keywords: Multi-component LBM-LES model; Turbulence; Tunnel; Methane and air flow; Validation (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:553:y:2020:i:c:s0378437120300807

DOI: 10.1016/j.physa.2020.124279

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