Pressure during compression gets too high

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 June 29, 2007, 07:38 Pressure during compression gets too high #1 A Student Guest   Posts: n/a Hi I am simulating a closed system. The pressure should rise from 30 to 4000bar by a piston compression. My problem is that with the initialized pressure of 30bar and the calculated volume to reach this pressure (though compressibility and displacement volume), the simulated pressure reaches the 400bar at around 50° and even rises further upto several 100000bar. Anybody has an advice for me? Thanks

 June 29, 2007, 13:24 Re: Pressure during compression gets too high #2 Andrea Guest   Posts: n/a Hi, you are contempling also the various heat transfer? I don't know what kind of fluid you're simulating but heat transfer can vary very much the kind of effective compression... May be if you tell more somebody can help you more than me! Bye

 July 2, 2007, 02:26 Re: Pressure during compression gets too high #3 A Student Guest   Posts: n/a Its a synthetic oil and the compressibility is in the user code just dependent on the pressure...

 July 2, 2007, 02:31 Re: Pressure during compression gets too high #4 Mike Guest   Posts: n/a Hi..try using bulk modulus factor since it is oil, as liquids of such nature are subjected to compressibility.

 July 2, 2007, 02:41 Re: Pressure during compression gets too high #5 A Student Guest   Posts: n/a Thx for the qouick answer, but where can i set the "bulk modulus factor"

 July 2, 2007, 07:28 Re: Pressure during compression gets too high #6 A Student Guest   Posts: n/a I already set the bulk modulus factor in the densit.f user-file with the calculated data through the formula: K=-V*dp/dv , but still the pressure gets too high Any idea why?

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