Yeah, thank you for the insight, but I do not have the a physical nozzle yet - is still in the development phase. When I try pressure boundaries, I see a covergence problem with continuity. I suppose this is what you meant. Let me know if you have any other suggestions. Meanwhile, I try velocity BC for inlet and check the pressure drop between inlet and outlet - if that corresponds to my required pressure difference. That should work too, right?
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