Variable slip coefficient in binary lattice Boltzmann models

TL;DR

This paper introduces a new method for achieving variable slip coefficients in binary lattice Boltzmann models, enabling more accurate simulation of gaseous flows with detailed boundary layer analysis.

Contribution

A novel approach to incorporate variable slip coefficients in binary lattice Boltzmann models, including boundary layer theory and validation through benchmark simulations.

Findings

Excellent agreement between analytical and numerical results

Effective modeling of boundary slip and Knudsen layer

Applicable to single- and multi-fluid BGK models

Abstract

We present a new method in order to get variable slip coefficient in binary lattice Boltzmann models to simulate gaseous flows. Boundary layer theory is presented. We study both the single- and multi-fluid BGK-type models as well. The boundary slip and the Knudsen layer are analyzed in detail. Benchmark simulations are carried out in order to compare the analytical derivation with the numerical results. Excellent agreement is found between the two situations.