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convergence problems with transonic missile

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Old   July 12, 2004, 10:33
Default convergence problems with transonic missile
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Emma
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I have a fine mesh of a smooth symmetrical missile. It's in 3D since I later want to add some fins and angle of attack.

M=1.2 and I have coupled explicit solver with RSM-turbulence model. I started with first order discretizations and got convergence and then changed to second order for flow and power law for the rest.

I have tried to lower the Courant number (from 1 to 0.3) and the under-relaxation factors (from default values to 0.3 on all of them) but the solution diverges or at least do not converge.

What am I doing wrong??

Please help!

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