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fvModels does not give expected result for turbulent channel flow |
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June 29, 2023, 11:55 |
fvModels does not give expected result for turbulent channel flow
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#1 |
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I am going to test the LES turbulent channel flow of OpenFOAM.
In the original test case (OpenFOAM 10) fvConstraints is used. Then I want to retest the problem by just setting the semiImplicitSource for momentum equation (i.e. a body force) in "fvModels". I set the body force according to g= u_\tau^2 * density / H. Here, H is the half channel height. And u_\tau is obtained from the Reynolds number definition for Re=395 as Re_\tau = u_\tau.H/(\nu). Interestingly, the velocity profile that I obtain is very different from the case of using fvConstaints. Can anybody explain why and how to set the pressure gradient (or body force) in a turbulent channel flow? |
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March 27, 2024, 09:01 |
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#2 | |
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Quote:
Therefore, if we want to do the test case with fvModels, the user-defined pressure gradient should be the same as what is reported by OF in fvConstraints output log. In this case, both fvModels and fvConstraints lead to the same u_\tau values. |
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channel, fvconstraints, fvmodels, semiimplicitsource, turbulent |
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