|January 8, 2015, 12:24||
Outflow of gas through the diaphragm effect
Join Date: Jan 2015
Posts: 1Rep Power: 0
I have a problem with modelling an ideal gas flow through the diaphragm in Ansys Fluent.
I have P0 (constant) pressure on the inlet and P1 (variable) pressure on the outlet. See picture https://www.dropbox.com/s/oz96rt0arc...11.39.png?dl=0
When P0=P1: v=0 (gas velocity), then we decrease P1 and velocity must increase until P1 reaches critical value P1*=0,5P0, like this https://www.dropbox.com/s/u1gkawi0s3...30.40.png?dl=0
It's happening becase gas velocity reaches local speed of sound and gas in P0 area can't feel P1 pressure. I think it comes from Saint Venant Equations (can't find actual source in English, sorry).
My problem is that velocity in Fluent increases in reverse ratio with P1 lke this https://www.dropbox.com/s/9azq829931...32.00.png?dl=0
Why? Help is very appreciated!
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