[zog]

I want to make a custom (pressure) boundary condition whose value is based on the surface flux in an internal surface. What would you recommend as a start, how would you proceed (is codedFixedValue even the right way to do it ?)

I think i need the following :
-a baffle that i can access in codedFixedValue (via fvPatch ?), but i don't know how to identify the correct surface/patch.
-a way to calculate the mass flow rate on this patch : a loop on the faces of the adequate patch (cf previous point) again with fvPatch for the positions of the faces and the velocity
-calculate the correct function and boundary condition
-loop over the BC patch faces and apply the custom pressure.

I think the main issue will be to find, identify and get the face variables of the internal face/baffle to feed the function.

Should i look into it using these checkpoints or is there an alternative, better and more appropriate way ?

In any case i am eager to take any advice as I am not an expert in openfoam programming at all, and I hope to progress doing some custom projects like this.