Reply To: Simulation of a jet of air into a shock tube

[Konstantin]

To add to Karthik's comments, I am sure you did due diligence and checked the steady-state simulation to confirm the flow developed as expected. Mesh min ortho quality is low but not too awful. Before investing into redoing the mesh, can you confirm what is happening before the divergence? E. g. save contours of the flow field (velocity, pressure, Mach) on the center plane through the domain (YZ plane) every few steps to identify what happens when the divergence occurs. This will give some pointers as to where the problem maybe coming from. Also, monitor your time step to see if it changes suddenly at the time of the crash.n