code_saturne User's Forum

Hello,


checking the code, I can't find an option to set a tensor diffusivity for user scalars. Can you please confirm me that such an option does not exist? If instead it exists, where can I find it? In covofi the only options for tensor diffusivity are for the RSMs.


Thanks

Hello,
There exists an option to activate tensorial diffusivity for a scalar without choosing RSM Models. Set "idften(ivar)=6" in usipsu, and then compute the field "visten" (look in covofi to access to it) in cs_user_physical_properties". Warning, you can't specify different diffusion tensor for different scalars.
Cheers
Martin

Hi Martin,


ok. I would like to insert an anisotropic diffusivity in the scalar equation and in the k and epsilon equations. Does that mean that I will always have the same diffusivity tensor and that I need to define some Prandtl or Lewis numbers to rescale according to each equation?


Thanks!

Hi Jacopo,
we could provide to the user the possibility of doing so in case of Eddy Viscosity Model. Yes, to distinguish the scalars, it is possible to play around with a Prandtl or a Schmidt turbulent number (it is ctheta for tensorial diffusivity).
Cheers