Critical grid method: An extensible Smoothed Particle Hydrodynamics fluid general interpolation method for Fluid-Structure Interaction surface coupling based on preCICE

TL;DR

This paper introduces a novel particle mesh coupling (PMC) method that enables meshless Smoothed Particle Hydrodynamics (SPH) to be integrated with the preCICE coupling library for fluid-structure interaction problems, addressing mesh mismatch issues.

Contribution

It proposes a critical grid as an intermediate medium to connect particle methods with preCICE, expanding its capabilities beyond mesh-based schemes.

Findings

PMC method effectively solves FSI problems with SPH and FEM.

The approach addresses mesh mismatch issues in particle-based FSI simulations.

Open-source code is provided for further development and validation.

Abstract

Solving Fluid-Structure Interaction (FSI) problems using traditional methods is a big challenge in the field of numerical simulation. As a powerful multi-physical field coupled library, preCICE has a bright application prospect for solving FSI, which supports many open/closed source software and commercial CFD solvers to solve FSI problems in the form of a black box. However, this library currently only supports mesh-based coupling schemes. This paper proposes a critical grid (mesh) as an intermediate medium for the particle method to connect a bidirectional coupling tool named preCICE. The particle and critical mesh are used to interpolate the displacement and force so that the pure Lagrangian Smoothed Particle Hydrodynamic (SPH) method can also solve the FSI problem. This method is called the particle mesh coupling (PMC) method, which theoretically solves the mesh mismatch problem based on the particle method to connect preCICE. In addition, we conduct experiments to verify the performance of the PMC method, in which the fluid and the structure is discretized by SPH and the Finite Element Method (FEM), respectively. The results show that the PMC method given in this paper is effective for solving FSI problems. Finally, our source code for the SPH fluid adapter is open-source and available on GitHub for further developing preCICE compatibility with more meshless methods.