Lattice Boltzmann model for compressible flows on standard lattices: Variable Prandtl number and adiabatic exponent.

Abstract

A lattice Boltzmann model for compressible flows on standard lattices is developed and analyzed. A consistent two-population thermal lattice Boltzmann is used which allows a variable Prandtl number and a variable adiabatic exponent, and appropriate correction terms are introduced into the kinetic equations to compensate for deviations in the hydrodynamic limit. Using the concept of a shifted lattice, the model is extended to supersonic flows involving shock waves, and the shock-vortex interaction problem is simulated to show the accuracy of the proposed model. Numerical results demonstrate that the proposed model is a viable candidate for compressible flow simulations.