code_saturne User's Forum

Dear Yvan
Recently I was studying the CFD about tidal flow.
you know the tidal flow has different directions. I want to simulate twice cycle period. it means I should change the inlet boundary condition to the outlet boundary condition.

I don't know the code_saturne has the function to change the boundary criteria. if not, I want to use the "restart" function. when I turn on the restart, I can choose the last case result->checkpoint as the boundary conditions. And the same time, I would change the inlet as an outlet, an outlet to an inlet when I can think that the tidal flow has turned the directions. then run the case. can I consider that it is a hot start?

My English is so poor, if I didn't describe it clearly, please forgive me ！Thank you for your help!

Best wish

Yvonne

Hello,

You cannot change the boundary type in the graphical user interface, but you can change it in user-defined functions using cs_user_boundary_conditions.f90 or (cs_user_boundary_conditions.c).

Using restarts as you suggest should be possible also if you only want to use the GUI.

Best regards,

Yvan

Dear Yvan.

I don't know if I've made myself clear or understood you, so I'd like to make sure.

It means I can't change the boundary conditions like the screenshot(attached the picture)

And I can set a boundary in the first simulation and then use the same mesh and physics parameters in "restart", just changing the boundary properties in the file cs_user_boundary_conditions.f90 ( Change nature inlet to outlet).

Many thanks for you!

Yvonne

Hello,

Yes, you can change the boundary condition types for a restart. At least I think it should work.
When in doubt, try it and check the results.

Regards,

Yvan

thank you so much . I will have a try