Improvement of Solid-Fluid Interaction Scheme in Lattice Boltzmann Immiscible Pseudopotential Models

TL;DR

This paper introduces an improved solid-fluid interaction scheme for the lattice Boltzmann pseudopotential model, reducing numerical artifacts and enhancing simulation accuracy for complex immiscible multiphase flows.

Contribution

The study develops a novel interaction scheme that mitigates spurious velocities and unphysical boundary layers while maintaining simplicity and leveraging higher-order isotropic schemes.

Findings

Effective reduction of spurious velocities.

Accurate simulation of complex multiphase flows.

Validated across multiple benchmark scenarios.

Abstract

The pseudopotential model within the Lattice Boltzmann Method (LBM) framework has emerged as a prominent approach in computational fluid dynamics due to its dual strengths in physical intuitiveness and computational tractability. However, when modeling wettability phenomenon, existing solid-fluid interaction schemes exhibit persistent challenges in multi-component immiscible fluid systems, notably manifested through spurious velocity artifacts and unphysical mass-transfer boundary layers. This study presents an improved interaction scheme that preserves implementation simplicity while effectively mitigating these numerical artifacts. Furthermore, leveraging the enhanced isotropy characteristics of eighth-order discrete schemes, we develop a novel boundary treatment methodology addressing second-layer lattice data reconstruction at complex interfaces. To verify the universality of the proposed optimization scheme, four benchmark scenarios, including static contact angle measurement on cylindrical surface, droplet dynamics through confined geometries, immiscible displacement processes, and co-current flow in microchannels, are simulated to demonstrate the proposed scheme's capability. The results show that the improved scheme can well simulate various complex immiscible multiphase flows.