I want to analyze a rocket nosecone at mach 0.9 using compressible flow. Currently, the nosecone is comprised of the nosecone wall (in black) and a base at x=3 with radius 0.5 (in red). However, in this form, when I tried to run a steady-state compressible simulation, all of my simulations crashed because the flat circular base is causing a huge pressure drop in the region (around -30000 Pa), leading to a negative temperature. I’m considering switching to transient time-dependency and adding a stub to the end of the nosecone. Does actually adding a stub fix the problem? If so, how should I add it?
Thank you for your advice.