|January 13, 2009, 07:16||
Pipe with valve
I'm trying to model a 3d inviscid flow, with liquid water, inside a pipe ended with valve.
At first the valve is open (with pressure outlet) and I use the steady solver to get a steady solution.
Then the valve has to be suddenly closed, so by using the steady solution as initial condition and changing the outlet to wall I can obtain an unsteady solution.
The problem is that I expect an increasing gauge pressure, while I get a fluctuating gauge pressure around zero in the closed pipe and I don't understand the reason.
By making the same test with air I get a similar result with constant density, while by using ideal gas density I get an increasing gauge pressure.
Any suggestion or reference will be really appreciated!!!
Thanks in advance!!!
PS:I'm using the UDF of the manual for water density and speed sound and a constant mass-flow-inlet.
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