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Search took 0.00 seconds. Search: Posts Made By: panda60
Forum: OpenFOAM March 25, 2010, 02:11
Replies: 121
Views: 35,061
Posted By panda60
Dear alberto, I want to know where the...

Dear alberto,
I want to know where the coefficient is easy to become negative. If this usually happens near the wall, I think dynamic model+VanDriest damping can solve this problem.

I saw...
Forum: OpenFOAM March 19, 2010, 02:45
Replies: 121
Views: 35,061
Posted By panda60
This is Kataoka's formula.

This is Kataoka's formula.
Forum: OpenFOAM March 19, 2010, 02:43
Replies: 121
Views: 35,061
Posted By panda60
Dear alberto...

Dear alberto (http://www.cfd-online.com/Forums/members/alberto.html) ,
Thank you very much. Your explanation is very good. So if it means dynamic Smagorinsky will be no useful ? And the dynamic...
Forum: OpenFOAM March 18, 2010, 23:25
Replies: 121
Views: 35,061
Posted By panda60
Dear Heng Xiao, I agree with you. "dynamic SGS...

Dear Heng Xiao,
I agree with you. "dynamic SGS modeling not needing wall function is only theoretical. Using a wall model (like wall damping, or wall stress model) may sometimes be desired". But I...
Forum: OpenFOAM March 12, 2010, 22:34
Replies: 121
Views: 35,061
Posted By panda60
Dear Heng Xiao, I think you are right. I change...

Dear Heng Xiao,
I think you are right. I change the near wall mesh again, use smooth ratio 1.25. Then use "delta smooth", and change Co number to 0.3 , now simulation has going on for 5000 steps,...
Forum: OpenFOAM March 11, 2010, 03:21
Replies: 121
Views: 35,061
Posted By panda60
Dear Roro Wang and heng Xiao, You are right, I...

Dear Roro Wang and heng Xiao,
You are right, I have wrong here.
VanDriest should not be use in dynamic model.
But even I use cubeRootVol or delta smooth, dynSmagorinsky model alwayse diverge after...
Forum: OpenFOAM February 1, 2010, 01:34
Replies: 121
Views: 35,061
Posted By panda60
My simylation always blow up. What I should pay...

My simylation always blow up. What I should pay attation to when using dynSmagorinsky model ?

Thanks.
Forum: OpenFOAM January 31, 2010, 23:39
Replies: 121
Views: 35,061
Posted By panda60
How to use dynSmagorinsky model correctly ?

Dear foamers,

I have trouble with using dynSmagorinsky model. Firsr I use Smagorinsky model. then I change to dynSmagorinsky, some times later, it blows up. I don't know how to use it correctly.
...
Showing results 1 to 8 of 8

 
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