Best practices for using segregated solver with compressible flow
In the AER team's experience, the following works well for compressible flows when using the segregated solver:
1) Initialize the flow to be near stagnation (velocity small but not zero, pressure
to inlet total pressure, temperature to inlet total temperature).
2) Turn off the energy equation for the first 50 iterations (solve->controls->
solution). Leave energy under-relaxation at 1.
3) Set pressure UR to 0.4 and momentum to 0.3.
4) After solution stabilizes and energy equation has been turned
on, increase pressure UR to 0.7.