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A flux-enriched Godunov method for multi-material problems with interface slide and void opening

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Barton, PT 
Nikiforakis, N 

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.

Description

Keywords

Multi-physics, Elastoplastic solids, Diffuse interface, Fracture, Slide, Void opening

Journal Title

Journal of Computational Physics

Conference Name

Journal ISSN

0021-9991
1090-2716

Volume Title

442

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/L015552/1)
UK Engineering and Physical Sciences Research Council (EPSRC) EP/L015552/1 and AWE plc.