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November 14, 2023, 02:50 |
Convergence in a supersonic intake
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#1 |
New Member
Adithya Ajay
Join Date: Nov 2023
Posts: 6
Rep Power: 3 |
Hello there,
Hope all are doing well, I will directly jump in to the problem My simulation of supersonic intake is not converging after a certain limit. Instead its oscillating. I know shock wave boundary layer interactiuons has inherent unsteadiness associated with it , so the residulas may oscillate while doing steady state analysis. But is there any way to reduce the residuals bit more? In some cases, after oscillating for long iterations, temparature is getting limited by fluent. I made temparature contour and found that I am having extremely high tempearture outside my intake ( on the tip of external domain). Why this happens? Images are attached here 1. Residual values after detecting divergence due to excessive temperature change. 274K Residuals (Divergence detected).png 2. Temperature contour after divergence detected Excessive temperature change 2.png My mesh is very fine inside the intake !! |
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November 14, 2023, 19:23 |
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#2 |
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 |
that's because of mesh
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November 15, 2023, 09:13 |
Please elaborate
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#3 |
New Member
Adithya Ajay
Join Date: Nov 2023
Posts: 6
Rep Power: 3 |
Is it because of mesh inside my intake or outside ( external domain). Min orthogonal quality is 0.9 , Max skewness is very less , but Max aspect ration is in the range of 100. Another thing I noticed on the mesh is : since I used stretching in Y direction to have Y+ 1, on the top side of the external domain cells are stretched perpendicular to flow direction.
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Tags |
convergence check, supersonic internal flows, temperature limited |
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