Bounded flows of dense gases

TL;DR

This study compares numerical methods for dense gas flows, showing that a simplified Lattice Boltzmann model is accurate and computationally efficient for various bounded flow scenarios at moderate densities.

Contribution

It introduces and validates a simplified Enskog collision operator within the Lattice Boltzmann framework for dense gas flow simulations.

Findings

FDLB model is accurate for low to moderate densities

FDLB has lower computational cost than DSMC-like methods

Model effectively simulates Fourier, Couette, and Poiseuille flows

Abstract

Numerical solutions of the Enskog equation obtained employing a Finite-Difference Lattice Boltzmann (FDLB) and a Direct Simulation Monte Carlo (DSMC)-like particle method (PM) are systematically compared to determine the range of applicability of the simplified Enskog collision operator implemented in the Lattice Boltzmann framework. Three types of bounded flows of dense gases - namely the Fourier, the Couette, and the Poiseuille flows - are investigated for a wide range of input parameters. For low to moderate reduced density, the proposed FDLB model exhibits commendable accuracy for all bounded flows tested in this study, with substantially lower computational cost than the PM method.