Turbulence model coefficients adjustment in the GUI

[mhassab]

Hello,

I am using the 4.0 GUI version of code saturne.

I was wondering how can I change the model coefficients (eg. sigma and C ..etc). This is not available in the GUI. Same for K omega model, what is available is only K omega SST, but I would like to use K-omega standard , how (or more precisely where ) can i modify the code?


in the file cs_user_parameters.f90 it is stated:


! User subroutines for input of calculation parameters (Fortran modules).
! These subroutines are called in all cases.

! If the Code_Saturne GUI is used, this file is not required (but may be
! used to override parameters entered through the GUI, and to set
! parameters not accessible through the GUI).

! Several routines are present in the file, each destined to defined
! specific parameters.

! To modify the default value of parameters which do not appear in the
! examples provided, code should be placed as follows:
! - usipsu for numerical and physical options
! - usipes for input-output related options

! If we are using the Code_Saturne GUI:

! parameters protected by a test of the form:

! if (ixmlpu.eq.0) then
! ...
! endif

! should already have been defined using the GUI, so only
! experts should consider removing the test and adapting them here.

!===============================================================================

! --- Turbulence
! 0: Laminar
! 10: Mixing length
! 20: k-epsilon
! 21: k-epsilon (linear production)
! 30: Rij-epsilon, (standard LRR)
! 31: Rij-epsilon (SSG)
! 32: Rij-epsilon (EBRSM)
! 40: LES (Smagorinsky)
! 41: LES (Dynamic)
! 42: LES (WALE)
! 50: v2f (phi-model)
! 51: v2f (BL-v2/k)
! 60: k-omega SST
! 70: Spalart Allmaras
! For 10, contact the development team before use

if (ixmlpu.eq.0) then

iturb = 21

endif


doesn't provide adjustable parameters, I am not sure if this is the right place to search for this.

Thanks,

[Yvan Fournier]

Hello,

The model coefficients are not in the GUI, as they are considered "advanced".

They are initialized in iniini.f90 (a non-user subroutine), and you can change them in cs_user_parameters.f90/usipsu.

The matching variables are documented in the Doxygen documentation, and possibly in the user pdf guide.

In any case, Code_Saturne includes several k-epsilon variants (standard and linear-production), but only the SST variant of k-omega. I am not knowledgeble about the standard k-omega variant, so I don't know if you just need to change constants or would need a different model...

Regards,

Yvan