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How to create the length of the recirculation zone in post-processing in ansys |
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June 23, 2020, 16:49 |
How to create the length of the recirculation zone in post-processing in ansys
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#1 |
Member
kumar
Join Date: Dec 2019
Posts: 33
Rep Power: 6 |
hello, I would like to Give a length scale of circulation zone for the turbulent flow aster generating Streamlines as shown in the picture.
Do anyone has an idea how to give than in Ansys or do I need to Use any other MS office application Thank you |
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June 23, 2020, 19:19 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,426
Rep Power: 49 |
The usual way to determine the reattachment point is through the sign change of wall shear stress.
With the images of streamlines you have here, one could only eyeball an approximate value. Not exactly the most scientific approach. |
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June 24, 2020, 03:26 |
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#3 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,833
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I agree, the point of zero normal derivative of the streamwise component is a correct quantitative measure.
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June 24, 2020, 18:22 |
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#4 |
Member
kumar
Join Date: Dec 2019
Posts: 33
Rep Power: 6 |
Thank you for the reply,
I had plotted skin friction but didn't get any negative values? might be the solution wrong? |
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June 24, 2020, 18:26 |
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#5 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,833
Rep Power: 73 |
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June 24, 2020, 18:31 |
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#6 |
Member
kumar
Join Date: Dec 2019
Posts: 33
Rep Power: 6 |
surface streamlines .. Incompressible flow Inlet velocity 4.5m/s Atmospheric outlet pressure K epsilon , wall enhanced solution converged at around 450 iter |
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June 25, 2020, 01:37 |
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#7 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
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Almost there. What we need here is the streamwise component of the wall shear stress. Alternatively, the wall-normal derivative of the streamwise velocity will do.
You are plotting skin friction coefficient, which Fluent derives from the magnitude of the wall shear stress vector. Hence why it only has positive values. |
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June 25, 2020, 11:29 |
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#8 |
Member
kumar
Join Date: Dec 2019
Posts: 33
Rep Power: 6 |
Thanks for your reply, Can We assume point where Cf is Zero as flow separation point?
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June 25, 2020, 12:39 |
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#9 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,426
Rep Power: 49 |
That should also work.
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