[sqymon]

Hi all

I am a beginner in CFD and just learning. My experience with CFD is hobbystic than business.
I want to check the flow through the valve - a very simplified version as on the photo
http://www.unitracc.com/aktuelles/bi...e/412116/image

I work on CFX. I added 1,5d pipe on the upstream and 5d on downstream side. My basic question is boundary conditions. Physically the inlet is to be 10bar=1MPa of stastic pressure and at the outlet free flow into the atmosphere.
What specific conditions should be set?

I set in CFX:
Fluid water, non-buoyant, k-epsilon
reference pressure 1atm (0,1MPa)
INLET - Total pressure 1MPa
OPENING - opening pressure and direction, related pressure 1atm (0,1MPa)

After solving I see some something incomprehensible to me.
INLET - static pressure ca.0,9MPa, Total pressure 1MPa - it OK like INLET BC
OPENING (outlet) - static pressure 0,1MPa (1atm) - it is correct? I think it should be 0MPa of static pressure and the total pressure should be a little bit bigger
I think that the differential pressure between inlet and outlet should be equal to static pressure

What should be boundary conditions for data: static pressure at the inlet and free flow to the atmosphere?