Fluid-Structure Interaction with the Entropic Lattice Boltzmann Method

TL;DR

This paper introduces a new fluid-structure interaction scheme combining the entropic lattice Boltzmann method with finite element analysis, validated through complex multiphase flow and droplet impact simulations.

Contribution

It develops a novel FSI scheme using the entropic multi-relaxation time lattice Boltzmann model coupled with FEM, extending it to multiphase flows and demonstrating robustness.

Findings

Validated scheme against literature data

Extended model to multiphase flows

Simulated droplet impact on superhydrophobic surfaces

Abstract

We propose a novel fluid-structure interaction (FSI) scheme using the entropic multi-relaxation time lattice Boltzmann (KBC) model for the fluid domain in combination with a nonlinear finite element solver for the structural part. We show validity of the proposed scheme for various challenging set-ups by comparison to literature data. Beyond validation, we extend the KBC model to multiphase flows and couple it with FEM solver. Robustness and viability of the entropic multi-relaxation time model for complex FSI applications is shown by simulations of droplet impact on elastic superhydrophobic surfaces.