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Old   August 3, 2013, 22:38
Default LES and TKE calculations
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MST
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Hi Everyone,
I have some questions. I am running LES WALE simulation in CFX. I got the following variables for the velocities as outputs:
1. Statistical Reynolds Stress uu
2. Statistical Reynolds Stress uv
3. Statistical Reynolds Stress uw
4. Statistical Reynolds Stress vv
5. Statistical Reynolds Stress vw
6. Statistical Reynolds Stress ww
7. Velocity Correlation uu
8. Velocity Correlation uu.Trnavg
9. Velocity Correlation uv
10. Velocity Correlation uv.Trnavg
11. Velocity Correlation uw
12. Velocity Correlation uw.Trnavg
13. Velocity Correlation vv
14. Velocity Correlation uw.Trnavg
15. Velocity Correlation vv
16. Velocity Correlation vv.Trnavg
17. Velocity Correlation uw
18. Velocity Correlation vw.Trnavg
19. Velocity Correlation ww
20. Velocity Correlation ww.Trnavg
21. Velocity
22. Velocity.Trnavg
23. Velocity x
24. Velocity.Trnavg x
25. Velocity y
26. Velocity.Trnavg y
27. Velocity z
28. Velocity.Trnavg z

V (full field , instantaneous) = resolved Velocity+ unresolved (V’).

1- Does the Velocity # 21 above represent full field velocity and (Velocity.Trnavg # 22) represent resolved part? If so, unresolved (V’)= Velocity- Velocity.Trnavg)? is V’ represent rms velocity?
2- Is “Statistical Reynolds Stress” represent unresolved part and can I calculate rms V’ by taking square-root of Statistical Reynolds Stress variable? If so, what is the difference between V’ that was calculated in question 1 and V’ from Statistical Reynolds Stress?
3- To calculate the mean flow kinetic energy, is it correct to use Kmean =0.5(Velocity Correlation uu.Trnavg+ Velocity Correlation uvv.Trnavg+ Velocity Correlation ww.Trnavg).
4- How to calculate the turbulent kinetic energy from the contribution of both resolved and unresolved parts, Kt= Kres+Kmod ?
5- What is the good metric for presenting turbulence strength? Turbulence eddy viscosity ratio or TKE?
Thank you so much in advance,,,
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Old   August 7, 2013, 18:57
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No body wants to share any knowledge about this?!!
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Old   August 8, 2013, 03:51
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Filippo Maria Denaro
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Quote:
Originally Posted by MST View Post
No body wants to share any knowledge about this?!!
Sorry but I think your question is for experts in CFX
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