A Kinetic Flux Difference Splitting Method for Compressible Flows
Abstract
A low diffusive flux difference splitting based kinetic scheme is developed based on a discrete velocity Boltzmann equation, with a novel three velocity model. While two discrete velocities are used for upwinding, the third discrete velocity is utilized to introduce appropriate additional numerical diffusion only in the expansion regions, identified using relative entropy (KullbackLiebler divergence) at the cellinterface, along with the estimation of physical entropy. This strategy provides an interesting alternative to entropy fix, which is typically needed for low diffusive schemes. Gridaligned steady discontinuities are captured exactly by fixing the primary numerical diffusion such that flux equivalence leads to zero numerical diffusion across discontinuities. Results for benchmark test problems are presented for inviscid and viscous compressible flows.
 Publication:

arXiv eprints
 Pub Date:
 November 2021
 arXiv:
 arXiv:2111.02340
 Bibcode:
 2021arXiv211102340S
 Keywords:

 Physics  Fluid Dynamics;
 Physics  Computational Physics