Residuals not converging, but staying stable and fluctuating
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Hi,
I am doing a hypersonic flow simulation on re-entry spacecraft, and for some reason, my residuals don't converge but rather stay stable for a while and then fluctuate (attached is a picture of it). I understand that the fluctuations could be decreased using relaxation factors, but could someone explain to me why the continuity and other variables aren't converging, as I would expect some sort of convergence after Would it be something to do with the mesh or initial BCS Thanks Attachment 82997 Attachment 82998 Attachment 82999 |
Do you have a fluctuating von-karman vortex street in the wake region?
Transient phenomenons cause fluctuations in residuals. You can run the simulations more 10000 iterations *here*, and see if the residuals converge or keep fluctuating. If they keep fluctuating but don't diverge, the solution might be okay. |
Ah I see thank you. I do notice Von-Karman Vortex sheets, and the results do look quite similar to the expected values. I have noticed though that my meshing is quite inconsistent, on of the blocks in a multi block grid. Do you think thatwould also have an effect?
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Could you post a photo of the 'inconsistent' meshing? |
3 Attachment(s)
Sure, I've attached some photos of the mesh. For some reason, Ansys won't let me use the edge sizing for one block of my grid, and I can't seem to find out why.
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