[PierluigiRossi]

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

[PierluigiRossi]

I have found in the src code (SU2_CFD/src/solver_direct_turbulent.cpp line 1111) the following lines:

  
 /*--- 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

[Vino]

Originally Posted by PierluigiRossi

I have found in the src code (SU2_CFD/src/solver_direct_turbulent.cpp line 1111) the following lines:

  
 /*--- 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.

  /* DESCRIPTION:  */
  addDoubleOption("FREESTREAM_NU_FACTOR", NuFactor_FreeStream, 3.0);

[PierluigiRossi]

Thank you so much Vino.

Best regards,
Pier