Pressure computation on inlet

Diego Nogueira

Greetings everyone,

I have a doubt on pressure boundary condition on inlet. I'm trying to simulate smtg as simple as an incompressible flow on a flat pipe, for instance.

I've seen this:

Pi = Pn - 2(Vn-Vi)/(dx*Re)

Pi -> pressure @ inlet. Pn -> pressure @ neighbor cell, Vn -> y-component of air velocity @ inlet

The problem with this is that since Pn depends on Pi and vice-versa, at some point on my computations these values explode while I was expecting them to reach a stable value at some point.

Could you help this poor CS guy? Are there any other options?