The transonic regime around Mach 1 is challenging to simulate - you need a method that can capture both subsonic and supersonic flow behavior, but the methods that can simulate supersonic flows suffer from numerical dissipation and are computationally intensive. We've introduced a hybrid simulation method in PowerFLOW that can use different simulation methods in a single model, so regions of subsonic and supersonic flow can each be simulated with the most suitable solver. The interface between domains guarantees conservation of mass, momentum, and energy, and gives accurate flow transition between fixed and rotating reference frames and meshes.

For more information, see our article on the SIMULIA blog, Transonic Flow Simulation in PowerFLOW.