Outlet/opening boundary condition
I am currently trying to model 2D free surface flow through a sump. I am having issues with my outlet boundary as I want to set it so there is no defined pressure or velocity. If I do set a pressure condition then fluid wants to flow back into the system due to the head loss through the sump. If I resolve this using an open boundary it is not realistic.
I have looked at the 2d flow over bump tutorial but that sets a down stream water level which I don't want to do.
Is there any outlet boundary condition or expression I can use which does not need to have a pressure or velocity set?
You can set the pressure level as an explicit result of the water level calculated by the solver. For a 2D case with a rectangular outlet boundary condition and gravity in +Y, this might do it:
Thanks that has worked for me. I have also run the test with a long channel downstream of the sump. Both methods give roughly the same results.
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