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Percentage of Turbulence

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Old   July 12, 2016, 17:37
Default Percentage of Turbulence
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Santiago
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Hi everyone

When you use a turbulence model ther is one more equation that must be solved and you must define a parameter that states the percentage of turbulence in the system.

I was wondering where is that parameter defined in SU2?

Thank you
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Old   July 22, 2016, 17:04
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Quote:
Originally Posted by s.ramirez429 View Post
Hi everyone

When you use a turbulence model ther is one more equation that must be solved and you must define a parameter that states the percentage of turbulence in the system.

I was wondering where is that parameter defined in SU2?

Thank you
In general, more detail about the configuration options beyond what is included in the config templates can be found by looking through CConfig::SetConfig_Options, in the file Common/src/config_structure.cpp.

If you are using the two-equation SST model, you are probably looking for:
FREESTREAM_TURB2LAMVISCRATIO
Which is the ratio of turbulent to laminar viscosity and defaults to 10, and is used by the two-equation SST model.

If you are using the SA model, you might be looking for FREESTREAM_NU_FACTOR, which if you investigate the implementation of the model in SU2 in the file SU2_CFD/src/solver_direct_turbulent.cpp, you will find that this defines the nu-tilde term as nu_factor * (freestream viscosity)/(freestream density), where nu-tilde is discussed at:
http://www.cfd-online.com/Wiki/Turbu...ary_conditions
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