code_saturne User's Forum

Dear Cédric,

you are right, the new gradient does not need a specifi COCG matrix for cells touching a boundary (because this term is put as explicit, this was done for sake of simplicity for vectors and then extended to scalar to save some time of recomputing it).

Best Regards

Martin

Hello,
Your flow is laminar (Re=10^-3), therefore no turbulence models are required.
Best Regards
Martin

Hello, I will try to answer to some of your interrogations. Concerning the warning about least square gradient, it is not a big deal (the criterion is not universal). What I would suggest for tetras is to use the least square gradient over extended neighbourhood by the way. Concerning the warning ab...

Hello,
When using a tetra mesh, we advice to activate "least square with extended neighbourhood" gradient calculation method in the GUI (or set: imrgra=2 in cs_user_parameters.f90).
Best regards
Martin

Hello,
In paraView, to visualise the fluid volume only (and not the boundary mesh) you should use filter->alphabetical->extract block
Then you can select the fluid domain only et click on apply.
You will be allowed to visualise pressure, velocity, etc
Best regards
Martin

Hello, concerning questions 1-5 of the message: Hello, Yvan I am sorry to disturb you again. In the last three months, I prepared the exam, and delayed my work. Recently I continue to simulate 2D turbulent flat plate(use SST model). As your suggestion, I generate a new mesh, and have any waring abou...

Hello, concerning your "problem" mentioned in: Thank Yvan for your reply! I'm a postgraduate from Northwestern Polytechnical University, China. Our research direction is lattice Boltzmann method(LBM). Since last September, I interested in Finite Volume LBM(FVLBM), and finial choose Code_sa...

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

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 differen...

Hello,

Your proposition is the best. Do not forget to activate a variable molecular viscosity.

Best Regards
Martin