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Supersonic Flow in UG/NX

Supersonic Flow in UG/NX

Supersonic Flow in UG/NX

(OP)
Hello,  has anyone simulated supersonic flow in UG/NX?  I have a fairly simple flat plate with a small protrusion.  The simulation runs well up to mach 1 or so.  when I try to run it at mach 1.08 it crashes.  I talked with Maya tech support (they make the CFD package for UG) and they told me that the software isn't tailored for flows with "external shocks".  The problem is that I am simulating flow through an arbitrary fluid volume which could be from the inside of a duct or inlet so from that perspective what's an "external shock"?

If anyone has done any simulation of supersonic flow in UG I would really appreciate any help you can offer.  The up loaded picture is a close up of my model at Mach 1.

Thanks
Scott  

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