I’ll point out one thing that I eventually encountered while doing my own validation. When you simulate the complete geometry, you will get much more local detail regarding pressure and velocity (obviously).
If you make a slice immediately downstream of the porous zone, this area is most likely going to have the lowest pressure fields. As you go a little bit further downstream, flow recovers some pressure as it readjusts (Bernoulli).
For the porous zone formulation, pressure drops are permanent - there’s no recovery. So if you don’t take the forementioned recovery into account, you will most likely end up with a pressure drop that is bigger than the one you would expect.
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