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Why Contours not display in turb. flow over Cyl.?

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Old   August 12, 2007, 07:23
Default Why Contours not display in turb. flow over Cyl.?
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Mahbub
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Hi to all,

I am trying to model turbulent flow over cylinder at Re= 3900 in 2D. I found good drag coefficient (0.9) but the contours of stream function or velocity or pressure doesn't demonstrated the vortex shedding in the wake. For your information, I give the parameters used: 2D-unsteady-seregeted solver, K-ebsilon turbulence model, enhanced wall treatment, PISO, time step size=.01, max iter. per time step=20,BC-Velocity inlet-periodic-wall-pressure outlet etc. What's the wrong with me? Please help me if you have any experience.

Mahbub

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Old   August 12, 2007, 08:46
Default Re: Why Contours not display in turb. flow over Cy
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Joe
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Could be any number of things...

ke often over predicts the turbulent viscosity.

You have to systematically evaluate all possible sources of disagreement.
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Old   August 12, 2007, 11:10
Default Re: Why Contours not display in turb. flow over Cy
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farhan
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try K-epsilon realizable model
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