# User-defined turbulent viscosity - kinematic or dynamic?

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 August 13, 2009, 16:45 User-defined turbulent viscosity - kinematic or dynamic? #1 Member   Join Date: Apr 2009 Posts: 78 Rep Power: 9 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.

 August 13, 2009, 16:50 #2 Member   Join Date: Apr 2009 Posts: 78 Rep Power: 9 Sorry, this should have been in the FLUENT section. I'll repost it there.

August 21, 2009, 02:15
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federico
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Quote:
 Originally Posted by tstorm 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

 August 21, 2009, 11:16 #4 Member   Join Date: Apr 2009 Posts: 78 Rep Power: 9 Yeah, I realized my mistake shortly after posting that thread. Thanks for your response though.

 January 29, 2010, 12:08 #5 New Member   Yogini Patel Join Date: Jan 2010 Location: Finland Posts: 15 Rep Power: 8 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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