CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

LES and TKE calculations

Register Blogs Community New Posts Updated Threads Search

Like Tree1Likes
  • 1 Post By MST

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 3, 2013, 23:38
Default LES and TKE calculations
  #1
MST
New Member
 
Join Date: Dec 2010
Posts: 6
Rep Power: 15
MST is on a distinguished road
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,,,
Mazze[ITA] likes this.
MST is offline   Reply With Quote

Old   August 7, 2013, 19:57
Default
  #2
MST
New Member
 
Join Date: Dec 2010
Posts: 6
Rep Power: 15
MST is on a distinguished road
No body wants to share any knowledge about this?!!
MST is offline   Reply With Quote

Old   August 8, 2013, 04:51
Default
  #3
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73
FMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura about
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
FMDenaro is offline   Reply With Quote

Old   May 30, 2016, 07:26
Default
  #4
Member
 
Lorenzo Mazzei
Join Date: Dec 2010
Posts: 60
Rep Power: 15
Mazze[ITA] is on a distinguished road
Did you find an answer?
Mazze[ITA] is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Time Evolution of TKE (LES) MaryBau OpenFOAM 1 March 22, 2011 08:40
Subgrid TKE in LES saqure FLUENT 0 February 12, 2011 22:42
How to calculation TKE in LES lizzy0zhou Main CFD Forum 4 February 11, 2011 14:05
LES of a confined impinging jet reactor.. vishwa OpenFOAM Running, Solving & CFD 8 December 7, 2010 19:11
Proper use of LES Karl Kevala FLUENT 3 September 8, 2001 13:38


All times are GMT -4. The time now is 13:17.