Rotation symmetry of the multiple-relaxation-time collision model

TL;DR

This paper discusses how to assign relaxation times in the lattice Boltzmann model to preserve rotational symmetry, leading to a model with decoupled shear and bulk viscosity verified through analysis and simulation.

Contribution

It introduces a method to assign relaxation times based on tensor irreducible representations, enhancing the flexibility and symmetry preservation of the LB model.

Findings

Decoupled shear and bulk viscosity achieved.

Hydrodynamic equations derived and verified.

Model maintains rotational symmetry.

Abstract

In the Hermite-expansion-based multiple-relaxation-time lattice Boltzmann (LB) model [Shan & Chen, Int. J. Mod. Phys. C, 18, 635, (2007)], a separate relaxation time is assigned to each of the tensorial moments of the collision term. Here we point out that to allow maximum flexibility while preserving the rotational symmetry of the relaxation physics, separate relaxation times can be assigned to the components of a tensor corresponding to its irreducible representation of SO(3) but not any finer. By decomposing the second moment in the LB model for polyatomic gases [Nie, Shan & Chen, Phys. Rev. E 77, 035701, (2008)], a model with decoupled shear and bulk viscosity is constructed. Hydrodynamic equation of the model is obtained via Chapman-Enskog calculation and verified by numerical simulation.