A multiscale simulation method for gas-liquid-solid three phase flow based on lattice Boltzmann method

• 1、Department of chemical engineering, Tsinghua University

Abstract：The Lattice Boltzmann Method (LBM) is a recently developed numerical scheme for simulating a variety of physical systems. LBM may arguably be classified as a mesoscopic approach for the simulation of fluid dynamics, and can be considered being between the molecular dynamics, which accesses micro-scale, but as a result suffers from severe time constraints in the investigation of hydrodynamics, and the finite-difference solution of the Navier-Stokes equations. It is a promising method which has been used broadly, including in multiphase flow modeling and simulations, because of its advantages. A multiscale simulation of the gas-liquid-solid three phase flow based on LBM was presented in this paper. A macroscale LBM two-fluid model and the mesoscale bubble dynamic model, particle dynamic model which were coupled by the interphase forces (drag force, virtual mass force and lift force) were proposed. It can be imagined that an in-depth study of the multiphase flow can be obtained by simulating and investigating with this unified model conveniently in the future.

Keywords： Lattice Boltzmann method Multiphase flow Multiscale analysis Interphase force.