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Vacuum chamber and choked flow simulation

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Old   September 17, 2013, 05:26
Unhappy Vacuum chamber and choked flow simulation
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Hello, I have a problem. I want to simulate an air flow from a 10^5 Pa zone to a 100 Pa zone. How can I activate choked flow? I think Fluent doesn't see it (in the throat there are subsonic conditions). Also I don't understand very well which parameters should be inserted in "operating pressure", "gauge pressure" in solution initialization and "supersonic\initial gauge pressure" (I used a mass flow inlet with the choked mass flow rate value). Can anyone help me?
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choked flow, gauge, mass flow inlet, operating pressure, vaccum chamber

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