Why is a velocity field asked
 

Why is a velocity field asked for when prescribing a pressure inlet? What is it for?

Best regards,
Christian Svensson

Hmm... how do you define your
 

Hmm... how do you define your pressure inlet condition?

When pressureInlet is chosen in FoamX the resulting BC for U is pressureInletVelocity which calculates U from phi on the boundary, and fixedValue for p.

Anyway, you normally solve for U and p meaning that you'll need BC's for both on all boundaries, OF doesn't assume anything.

Hope it's a bit clearer.

//Eric