code_saturne User's Forum

Hello,

I am modeling a turbine and i try to set a pressure in usclim.f90 file.
How can i modify the pressure inlet please ?

Thanks.

A real clear and concise, step by step guide/tutorial/whatever on this particular subject for real dummies (such as myself), would be very much appreciated

/C

Hello

Could you be more specific on your initial demand?
Do you want to impose a pressure gradient in your domain, do you want to impose a constant pressure at the outlet or at the inlet, ...?

Best regards.

Hello,

Thank you for your answer, i want to impose a constant pressure at the inlet.
If you have any solution, don't hesitate.

Best regards.

Hello,

You may find some posts relative to this searching in the "old forums" archive, but this is not trivial in Code_Saturne:

Remember that the code is mainly intended for incompressible flows (the compressible module is still somewhat experimental), and so the pressure is a potential, whose absolute value has no importance, but whose differential is important. It is not a "thermodynamic" pressure.

So for example if you prescribe a pressure at the inlet and a free outlet, nothing much will happen. If you prescribe a velocity at either the inlet or outlet, and use a free inlet/outet condition for the other, you will have a "regular" calculation.

To prescribe a pressure differential ant let the velocity "adapt", using a velocity source term is the usual means with Code_Saturne.

Again, you may find some additional examples in the old forum, but just "prescribing a pressure at the inlet" without telling us anything about your other boundary conditions will not help us help you...

Regards,

Yvan