One-sweep moment-based semi-implicit-explicit integration for gray thermal radiation transport

Ben S. Southworth, Samuel S. Olivier, HyeongKae Park, Tommaso Buvoli

Abstract: Highlights•Implicit-explicit Runge-Kutta integration for SN discretizations of gray thermal radiation transport.•One implicit sweep and one implicit low-order solve per time step/stage.•2nd-order accuracy observed on stiff thick Marshak and crooked pipe benchmark problems.•Orders of magnitude improvement in accuracy and wallclock time compared with standard first-order implicit integration.