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Hello everybody.

I need to run a case in whitch inlet and outlet are strictly linked. I mean that I need to impose Uz velocity component on inlet ( = flux through inlet), calculate the internal velocity field and then impose Ux and Uy veolcity at inlet equal to the ones calculated for outlet, while keeping the same Uz velocity component on inlet.
It seems to me that the problem is closed and correctly defined ( = no circular definition of BCs), since for time zero I impose U = (0 0 Uz) at inlet and for each following time step I impose U = (Ux (outlet,former time step) Uy (outlet, former time step) Uz ).
I have to use a structured mesh and for each inlet node there's a corresponding node at outlet, so I should not have problems of interpolation.
Is there anyone who knows if there is an already implemented BC for my case?
If not, is there anyone who knows how to write a new BC and can give me some advice? I quite know C++ code but I don't have any idea of how BC have to be implemented in OF.

Thank in advance.