Hello James,
What happens if you set a flow rate (mass or volume) on the inlet, along with a pressure at the outlet?
Cheers, Rich.
Rich,
We are not sure of the flowrate at the inlet because it is a new design. We have made some assumptions and guessed the flowrate based on older valve data, and it does work, but the flowrate is still in question because on 2 other sizes of valves the flowrate has increased and decreased based on the changes we have made and that changes the way we look at the dimensional changes made.
Thanks James
Hello James,
can you post more details, such as the actual pressures you are applying at inlet and outlet?
Also, post screenshots of your computational domain, and perhaps a cut plot or three? Trajectories perhaps?
Also include your version, such as SW2009 SP2.1, or whatever.
Thanks, Rich.
Hi,
Maybe there is some cavitation??
If you check "cavitation" option you should not get negative values any more and see if cavitation area is important or not.
There have been some performance inprovements in Flow Simulation 2010 when solving with cavitiation enabled.
Another question for you is whether you are treating this as an external flow problem or internal? If you have jetting out the sides, it may be helpful to run this as an internal flow by adding some dummy geometry surrounding the jet.
Hi,
Maybe there is some cavitation??
If you check "cavitation" option you should not get negative values any more and see if cavitation area is important or not.