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User-defined turbulent viscosity - kinematic or dynamic?

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Old   August 13, 2009, 16:45
Default User-defined turbulent viscosity - kinematic or dynamic?
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The k-e and k-w models have the option for a user-defined turbulent viscosity. Does anyone know if that turbulent viscosity is dynamic viscosity or kinematic viscosity? The difference of course is just a factor of density, which is nearly 1 for air in SI units, so the difference is small. Still, I don't know which it should be.
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Old   August 13, 2009, 16:50
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Sorry, this should have been in the FLUENT section. I'll repost it there.
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Old   August 21, 2009, 02:15
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federico
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Quote:
Originally Posted by tstorm View Post
The k-e and k-w models have the option for a user-defined turbulent viscosity. Does anyone know if that turbulent viscosity is dynamic viscosity or kinematic viscosity? The difference of course is just a factor of density, which is nearly 1 for air in SI units, so the difference is small. Still, I don't know which it should be.
the question seems strange to me, kinematic and dynamic viscosity are a characteristic of the fluid, instead the turbulent viscosity is a characteristic of the flow, it is defined to close Navier Stokes equation with turbulence model
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Old   August 21, 2009, 11:16
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Yeah, I realized my mistake shortly after posting that thread. Thanks for your response though.
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Old   January 29, 2010, 12:08
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Hello,

Two equations models(k-e and k-w models) are used to find the eddy viscosity(or turbulent viscosity).And the turbulent viscosity is dynamic viscosity.
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