At this year's ASTRONUM conference Simon Candelaresi gave a talk on "Coupled Multiphysics Simulations Using Trixi.jl". After the talk there were discussions with other scientists who work mostly in astrophysical simulations. ASTRONUM is an annual conference alternating between Europe and the US.

Abstract

Making use of the partial differential equations solver Trixi.jl, written in Julia, we develop adaptive multiphysics interface coupling for arbitrary equations. The physics of the coupling can be freely chosen by the user and can be designed to conserve quantities, like momentum and energy. Using the quadtree p4est we are able to arbitrarily partition the domain into subdomains on which we solve different equations. These domains can be non-simply connected domains. Our coupling can be dynamic in time. If the criteria for the domain decomposition for the different models change, we can adapt these domains automatically through our implementation of Adaptive Model Selection (AMS). Furthermore, AMS works together with Adaptive Mesh Refinement (AMR), which makes our implementation particularly versatile and efficient.