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Old   October 31, 2007, 07:38
Default Turbulent Viscosity Modification
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I'm using CFX-10 and I need to use a particular definition for the turbulent (eddy) viscosity. Since this is no input variable, can I do it using a CEL routine or do I have to use the MMS in a user routine? If MMS is needed, could anyone tell me the path of turbulent viscosity in it?

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Old   October 31, 2007, 07:46
Default Re: Turbulent Viscosity Modification
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Dear Magnoli,

You should be able to overwrite the Eddy Viscosity under the Advanced Control of the turbulence model using a CEL expression.

Hopefully, you should not need any userCEL routine to do this. As an additional advice, overwriting data directly on the MMS is not a good practice that can lead to strange/bizarre behavior. The ANSYS CFX solver has specific API's to write/update data that when circumvented could produce undesirable results.

Hope this helps,

Juan Carlos

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Old   October 31, 2007, 08:11
Default Re: Turbulent Viscosity Modification
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Dear Juan Carlos,

this is exactly what I needed!

Thanks a lot, Marcelo.
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Old   September 16, 2015, 09:56
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Dear all,
I am using CFX-16.0, and I want to modify the eddy viscosity just like Magnoli. However, since I try to simulate a multiphase flow, I just do not get what does CFX when modifying the eddy viscosity with the user-interface "Advanced Turbulence Control". It is a homogeneous multiphase case, so I have 2 eddy viscosity and I do not understand why they are different? Does the solver not only solving k-epsilon turbulence equations for 1 "mixture" fluid? What is the link between these 2 eddy viscosities? Which one is affected by the modification allowed through the Advanced Turbulence Control?
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