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-   -   3d turbulence (http://www.cfd-online.com/Forums/openfoam-solving/103163-3d-turbulence.html)

raghibme June 12, 2012 13:24

3d turbulence
 
2 Attachment(s)
Hi!
I am trying to simulate density current(lock exchange/ dam break type problem) in openfoam using bouyantBoussinesqPimpleFoam.I run my simulation & the problem that i am facing is I want 3d fluctuations(due to turbulence) in my simulation but it doesn't show any.What I mean I want variation of alpha1 in Z direction(3d variation of property ).I found interFoam with dambreak case also showing a flat surface in contour plot which means no variation of alpha1 in z direction.I appreciate any suggestion.I am new to openfoam & stuck with this problem for so long.I attached 2 fig what I have got from my simulation(fig(1)contour plot) & what I required(fig(2))

Bernhard June 12, 2012 15:06

What turbulence model do you use? Or are you trying a DNS?

raghibme June 12, 2012 15:55

I used RAS model here for turbulence.

Bernhard June 12, 2012 16:00

Then it makes sense, since RANS models only give you average quantities.

raghibme June 12, 2012 16:09

Have you got any 3D turbulence in any other model?I am really got stuck with this ..may be due to low mesh I could not find any instability but I couldnt find any variation in alpha1 in z span.


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