Tensor scalar diffusivity

[deandrade87]

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

[Martin FERRAND]

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

[deandrade87]

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!

[Martin FERRAND]

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