Elimination of Nonlinear Deviations in Thermal Lattice BGK Models

Details Elimination of Nonlinear Deviations in Thermal Lattice BGK Models Elimination of Nonlinear Deviations in Thermal Lattice BGK Models

1993-10-05

arxiv.org/abs/comp-gas/9310001v1

Nonlinear Sciences

Cellular Automata and Lattice Gases

4 pages, 1 table, 4 figures

Scientific paper

Abstracet: We present a new thermal lattice BGK model in D-dimensional space for the numerical calculation of fluid dynamics. This model uses a higher order expansion of equilibrium distribution in Maxwellian type. In the mean time the lattice symmetry is upgraded to ensure the isotropy of 6th order tensor. These manipulations lead to macroscopic equations free from nonlinear deviations. We demonstrate the improvements by conducting classical Chapman-Enskog analysis and by numerical simulation of shear wave flow. The transport coefficients are measured numerically, too.

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