Boundary conditions in MH4D, a tetrahedral mesh MHD code

Boundary condition enhancements have been made to MH4D, a parallelized, tetrahedral mesh finite volume MHD code. Multi-directional periodic boundary conditions have been implemented and tested by simulating obliquely propagating linear sound waves and shear Alfven waves in a triply periodic box. Dispersion relations were found to be in good agreement with expected values. An insulating boundary condition has been added such that plasma interaction with electrically isolated electrodes can be modeled. A plasma-armature railgun has been simulated in rectangular geometry. Initial simulations of the ZaP z-pinch experiment have been conducted. This poster describes these boundary condition implementations and associated simulations.