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multiphase model and drag law

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Old   April 29, 2008, 07:44
Default multiphase model and drag law
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I wish study a multiphase flow( mixture model ni Fluent) : air is the principale phase, water is the secondary. the droplets diameter is average 1mm. the model is not convergent, indeed there is a matter with the turbulent viscosity. after reading Fluent documentation, I found that the drag law ( Schiller-Naumann law)for drag coefficient calculation is not available for a model where bubble are larger than 0.1mm. I have desactivate this law ( interactions between phases)and the model converge. However, it's physically wrong, because droplets aren't constrained by the flow.

Do you have some ideas which explain the probleme of drag law?

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