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September 18, 2014, 23:50
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non-physical points
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#1 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13  |
I simulate a supersonic aircraft with SU2, but it appears there are some non-physical points until the end. I wonder whether the result is credible. Could you help me. Thanks.
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September 19, 2014, 05:41
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#2 |
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Senior Member
Vino
Join Date: Mar 2013
Posts: 130
Rep Power: 13 |
Can u tell me more about your config what u are using exactly?
1) Some solvers like AUSM was having problem for CFL=0.9 (EULER_EXPLICIT) when I was simulation a 2D blunt body at M=20. When I reduced the CFL to 0.5 . it was working fine. 2) If you are using steady simulation, by default It uses local time stepping, you may have to add UNSTEADY_SIMULATION=TIME-STEPPING to make it global time stepping. (local time stepping was creating non-physical points for my case) These are the two things I have done for my case and my problem got solved. Thanks.!!! |
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September 19, 2014, 06:01
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#3 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
This is my config file. I wonder wherther the non-physical points is related to the quality of mesh?
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September 19, 2014, 06:36
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#4 | |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
Quote:
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September 19, 2014, 15:34
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#5 |
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Senior Member
Vino
Join Date: Mar 2013
Posts: 130
Rep Power: 13 |
Config file looks fine for me. As you said, there may be problem with mesh quality. One more thing you can try out is, use MSW spatial discretization instead of AUSM. you can try with out multi-grid also.
This may also help you. http://www.cfd-online.com/Forums/su2...al-points.html Thanks.!!! |
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September 19, 2014, 22:30
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#6 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
Thank you.
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September 21, 2014, 06:28
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#7 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
I use the same mesh within fluent software. The hypersonic simulation results is good. But it always appears some non-physical points in SU2. Could someone help me?
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September 21, 2014, 09:14
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#8 |
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New Member
Khiem Pham
Join Date: Nov 2013
Posts: 23
Rep Power: 13 |
Hi Wang
I'm trying to run SU2_MSH for airfoil RAE_2822, but when i'm using mesh_out.su2, i have an error. Could you please send me a config file (with grid adaptation options) and restart files (i.e flow_solution, adjoint files..) of your case? Thank you |
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September 21, 2014, 12:08
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#9 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
Hi, this is my files. I only try the MSH with naca0012.
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September 21, 2014, 12:54
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#10 |
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New Member
Khiem Pham
Join Date: Nov 2013
Posts: 23
Rep Power: 13 |
Thank you very much!
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September 26, 2014, 22:48
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#12 |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
Thanks!!!!
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September 27, 2014, 09:47
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#13 | |
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Member
wangjian
Join Date: Nov 2013
Posts: 54
Rep Power: 13 |
Quote:
I couldn't understand the explanation on YouTubu for my bad English listening. Could you explain again about this question. Thank you very much. |
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