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Old   June 12, 2012, 13:24
Default 3d turbulence
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Raghib
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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))
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File Type: jpg flat fluid surface(currentwork).jpg (13.7 KB, 20 views)
File Type: jpg 3D disturbance(Required).jpg (27.9 KB, 25 views)
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Old   June 12, 2012, 15:06
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Bernhard
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What turbulence model do you use? Or are you trying a DNS?
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Old   June 12, 2012, 15:55
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I used RAS model here for turbulence.
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Old   June 12, 2012, 16:00
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Then it makes sense, since RANS models only give you average quantities.
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Old   June 12, 2012, 16:09
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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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