A Flux-enriched Godunov Method for Multi-material Problems with Interface Slide and Void Opening

TL;DR

This paper introduces a novel flux-enriched Godunov method for 3D multi-material simulations that handle large deformations, sliding interfaces, voids, and fracture, with high parallel efficiency and validation against experiments.

Contribution

It extends diffuse interface methods with new flux-modifiers and seeding routines, enabling complex boundary conditions, interface generation, and fracture modeling in a computationally efficient way.

Findings

Excellent agreement with experimental results.

Effective handling of slip and void opening.

Suitable for large-scale, adaptive simulations.

Abstract

This work outlines a new three-dimensional diffuse interface finite volume method for the simulation of multiple solid and fluid components featuring large deformations, sliding and void opening. This is achieved by extending an existing reduced-equation diffuse interface method by means of a number of novel flux-modifiers and interface seeding routines that enable the application of different material boundary conditions. The method allows for slip boundary conditions across solid interfaces, material-void interaction, and interface separation. The method is designed to be straightforward to implement, inexpensive and highly parallelisable. This makes it suitable for use in large, multi-dimensional simulations that feature many complex materials and physical processes interacting over multiple levels of adaptive mesh refinement. Furthermore, the new method allows for the generation of new interfaces in a conservative fashion and therefore naturally facilitates the simulation of high-strain rate fracture. Hence, the governing model is augmented to include ductile damage to allow for validation of the method against demanding physical experiments. The method is shown to give excellent agreement with both experiment and existing Eulerian interface tracking algorithms that employ sharp interface methods.