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How can TKE help me in explaining flow separation happening in an airfoil?

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Old   July 20, 2024, 03:18
Smile How can TKE help me in explaining flow separation happening in an airfoil?
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Anupam Krishnan
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Hi all,
I am doing URANS simulation to study the effect of turbulence intensity on NACA 2414 airfoil at a Re of 100000. The lift coefficients increase with the increase in TI for an AOA of 20 deg, and the drag coefficients decrease with an increase in TI. How can the TKE plots be used to explain flow separation and variation in aerodynamic coefficients?
I am adding TKE plots at 20 deg AOA.
Attached Images
File Type: jpg 20 deg 1% tke.jpg (61.5 KB, 10 views)
File Type: jpg 20 deg 5% tke.jpg (85.0 KB, 10 views)
File Type: jpg 20 deg 10% tke.jpg (102.4 KB, 10 views)

Last edited by yujin_cfd; July 20, 2024 at 03:20. Reason: To add figures.
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Old   July 20, 2024, 13:00
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Lucky
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I think it is meaningless to discuss physical explanations when you have a discontinuity in your tke plots caused by the grid! How can you explain a change in the tke when you didn't change the tke?
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Old   July 21, 2024, 08:18
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Anupam Krishnan
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Thanks for the reply.
Consider me a beginner. I have 2 questions on your reply.
1. What do you mean by discontinuity caused by the grid? If I take it into CFD Post, I am still able to get a continuous contour for the TKE.
2. Changing the Turbulence Intensity basically changes the TKE for the flow as well right? Can I assume that high TKE is associated with flow separation and dissipation?
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airfoil 2d, tke, turbulent kinetic energy, urans model

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