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How to set boundary conditions for \tilde{nu} for SA turbulence model?

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Old   May 7, 2015, 04:37
Post How to set boundary conditions for \tilde{nu} for SA turbulence model?
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Pierluigi Rossi
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Dear SU2 users,

I am new to SU2 and I am trying to run the TestCases/rans/naca0012.
Can someone suggest me how to set the freestream boundary condition for nu tilde variable?

Thank you very much.
Pierluigi
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Old   May 7, 2015, 08:16
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Pierluigi Rossi
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I have found in the src code (SU2_CFD/src/solver_direct_turbulent.cpp line 1111) the following lines:
Code:
  
 /*--- Factor_nu_Inf in [3.0, 5.0] ---*/ 
   
  Factor_nu_Inf = config->GetNuFactor_FreeStream(); 
  nu_tilde_Inf  = Factor_nu_Inf*Viscosity_Inf/Density_Inf;
This is exactly what I was looking for.
So I have to define a FREESTREAM_NU_FACTOR = 4.0 in the config.cfg file to get a new value? Is 3.0 the default? Where can I search this information?

Thank you so much.
Pier
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Old   May 12, 2015, 13:22
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Vino
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Quote:
Originally Posted by PierluigiRossi View Post
I have found in the src code (SU2_CFD/src/solver_direct_turbulent.cpp line 1111) the following lines:
Code:
  
 /*--- Factor_nu_Inf in [3.0, 5.0] ---*/ 
   
  Factor_nu_Inf = config->GetNuFactor_FreeStream(); 
  nu_tilde_Inf  = Factor_nu_Inf*Viscosity_Inf/Density_Inf;
This is exactly what I was looking for.
So I have to define a FREESTREAM_NU_FACTOR = 4.0 in the config.cfg file to get a new value? Is 3.0 the default? Where can I search this information?

Thank you so much.
Pier

Hi,

Yes. FREESTREAM_NU_FACTOR will work in config file. The default value is set as 3.0. You can find this in config_structure.cpp file. looks like this.
Code:
  /* DESCRIPTION:  */
  addDoubleOption("FREESTREAM_NU_FACTOR", NuFactor_FreeStream, 3.0);
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Old   May 12, 2015, 14:16
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Pierluigi Rossi
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Thank you so much Vino.

Best regards,
Pier
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