Parallel unstructured finite volume lattice Boltzmann method for high-speed viscid compressible flows

Zhixiang Liu (), Rongliang Chen () and Lei Xu
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Zhixiang Liu: College of Information Technology, Shanghai Ocean University, Shanghai 201306, P. R. China
Rongliang Chen: ��Research Center for Science and Engineering Computation, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China
Lei Xu: College of Information Technology, Shanghai Ocean University, Shanghai 201306, P. R. China

International Journal of Modern Physics C (IJMPC), 2022, vol. 33, issue 05, 1-20

Abstract: Based on the double distribution function Boltzmann-BGK equations, a cell-centered finite volume lattice Boltzmann method on unstructured grids for high-speed viscid compressible flows is presented. In the equations, the particle distribution function is introduced on the basis of the D2Q17 circular function, and its corresponding total energy distribution function is adopted. In the proposed method, the advective term is evaluated by Roe’s flux-difference splitting scheme, and a limiter is used to prevent the generation of oscillations. The distribution functions on the interface are calculated by piecewise linear reconstruction, in which the gradient is computed by the least-squares approach. In order to do large-scale simulations, a parallel algorithm is illustrated. The present method is validated by a flow around the NACA0012 airfoil and a flow past a circular cylinder at high Mach numbers. The results agree well with the published results, which demonstrate that the present method is an efficient numerical method for high-speed viscid compressible flows. The parallel performance results show that the proposed parallel algorithm achieves 90% parallel efficiency on 4800 cores for a problem with 1.4×108 unstructured triangle cells, which shows the potential to perform fast and high-fidelity simulations of large-scale high-speed viscid compressible flows in complicated computational domains.

Keywords: Double distribution functions; lattice Boltzmann equations; finite volume method; high-speed viscid compressible flows; unstructured grids; parallel computing (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0129183122500668

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