Dear Bacha,

If you have implemented your own weak equations in a consistent way (i.e. with all the boundary and initial conditions, etc.) there is no need to couple it to anything else.

Kind regards,

Julian

Thank you so much, Julian.

Dear Julia,

Please, can you guide me how I can impose inlet and oulet boundary conditions for channel flow in the modeled weak form PDEs (above case)?.

Dear Bacha, I think that is a question you can better ask to the COMSOL support team. They are very good and fast in their answers .

Kind regards,

Julian

I agreed with J. Anaya

All the best

Thanks all. The J. Anaya answer is correct. Thanks again J. Anaya.