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non dimensionalisation eddy viscosity, mixing length and turbulent shear stress |
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January 30, 2019, 10:20 |
non dimensionalisation eddy viscosity, mixing length and turbulent shear stress
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January 30, 2019, 10:23 |
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#2 |
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Lucky
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You can non-dimensionalize anything anyway you want. The question is what you are going to do with these quantities later? Then you want to choose a non-dimensionalization that makes sense.
For example, the friction velocity isn't just a random non-dimensionalization of shear stress, but it is used because that's the characteristic velocity in the perturbatino when you do asymptotic analysis (i.e. u+ = y+ which happens only you scale u and y using u*). |
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January 30, 2019, 10:29 |
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January 30, 2019, 11:44 |
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Filippo Maria Denaro
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Actually, the eddy viscosity function is naturally non-dimensional when is computed from a non-dimensional expression. Just use the correct velocity and pressure reference quantities to work directly in terms of u+ and Re_tau. You can find in Sec.5 of this paper how to select the variables https://www.researchgate.net/publica...ection_methods |
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January 30, 2019, 13:22 |
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#5 |
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eddy viscosity, turbulence, viscous flow |
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