Lattice Boltzmann Models for Complex Fluids

TL;DR

This paper introduces various Lattice Boltzmann models capable of simulating complex fluid behaviors such as rough wall effects, shear thinning, and granular flow, highlighting their ability to reproduce boundary layers and density waves.

Contribution

It presents novel Lattice Boltzmann models that effectively simulate complex fluid phenomena including boundary effects and nonlinear viscosity behaviors.

Findings

Boundary layers generated by wall roughness are examined.

Shear thinning leads to plug flow with sharp density contrasts.

Density waves occur due to nonlinear viscosity dependence.

Abstract

We present various Lattice Boltzmann Models which reproduce the effects of rough walls, shear thinning and granular flow. We examine the boundary layers generated by the roughness of the walls. Shear thinning produces plug flow with a sharp density contrast at the boundaries. Density waves are spontaneously generated when the viscosity has a nonlinear dependence on density which characterizes granular flow.