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December 7, 2011, 18:13 |
CFX13 Post Periodic interface
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#1 |
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I am simulating a axial compressor rotor. I used my mesh in CFX11 and CFX 13. I waited until mass is converged for both cases.
When I used CFX 11, upper periodic side and lower periodic side have same Velocity v. But, for the case with CFX 13, upper periodic side and lower periodic side have slightly different Velocity v. Especially near blade tip. What am I doing wrong? |
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December 8, 2011, 01:24 |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Can you post an image? And CCL would help.
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December 8, 2011, 14:18 |
Here are CCL & image
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#3 |
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I attached an axial cut of passage. It shows an unexplainable shift.
Thank you Here is the CCL: PHP Code:
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December 8, 2011, 16:23 |
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#4 |
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Glenn Horrocks
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Can you show what the problem is? It is not clear.
But if you are talking about the interfaces then that is just a post processing rendering thing. The underlying simulation should be the same. View both simulations with the same post processor and it should look the same. |
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December 8, 2011, 16:46 |
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#5 |
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If you look to the picture, you can see there is a clear shift in the middle.
Normally, two periodic interfaces should coincide and have same values. It is a not a interface problem. I think there is a tolerance in the periodic side, whose default value is increased when switching from CFX 11 to CFX 13. Thanks |
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December 8, 2011, 16:51 |
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#6 |
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Glenn Horrocks
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As I said, I suspect it is a post processing issue. Have you compared the two runs on the same post processor? It might be rendered differently between V11 and V13.
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December 8, 2011, 16:57 |
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#7 |
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Yes, I did. CFX 11 run has same velocities at periodic boundary in CFX 13 Post. But still, the run from CFX 13, in CFX 13 Post, shows slightly different velocities.
(CFX 11 Post does not accept the runs of CFX 13) |
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December 8, 2011, 17:15 |
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#8 |
Super Moderator
Glenn Horrocks
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Location: Sydney, Australia
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So that proves it, doesn't it? It is a post-processor rendering thing. The simulations are the same.
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Tags |
cfx post 11, cfx post 13, periodic bc, rotor |
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