code_saturne User's Forum

Hello everyone,

Just a quick question about outgoing flow,
I want to modelize a wind tunnel and my condition is an outgoing flow, how can I manage to do that ?
Do I have to set the outlet as an inlet with a negative velocity and the inlet as a free inlet/outlet ?

Moreover the incoming flux is heated to a constant temperature, so is there a way to apply a temperature to the free inlet ?

Thank you,
Regards,

Quentin

P.S. : I am using the GUI with Windows

Hello,

Yes, an inlet with a negative velocity should work as a prescribed outlet.

I'm not sure about prescribing a temperature on a free inlet/outlet. You can probably force the Dirichlet condition using low-level user functions. For a standard outlet, the GUI allows setting a prescribed value for backflow, so you may experiment that first (instead of a free inlet/outlet).

Regards,

Yvan

Thank you very much Yvan I will try that,
I have also a little question about symmetries :

Is the previous picture equivalent to the following one ? (the dotted planes are the symmetry planes)
(just to ensure that code_saturne support those two symmetric planes as it should be mathematically).

Regards,

Quentin

Hello,

Yes, this should work. We have some minor precision issues with this type of symmetry, so using a rotational periodicity may be an alternative, though it is computationally more costly.

Best regards,

Yvan