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floating operating pressure and monitors force

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Old   September 7, 2007, 07:14
Default floating operating pressure and monitors force
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Lavastre jeremie
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Hello,

I'm a french student in Hydraulics et I have a problem of CFD. I carry out a unsteady, ideal gaz, turbulence, segregated calculation. In fact,I'm pumping a gas into a tank and the flow which enters has a low mach. So, I use the floating operating pressure to avoid roundoff errors. My aim is to calculate the moment exerted by gas on a wall of the tank. Fluent calculates this moment from static pressure which is a relative pressure. Me I want the absolute pression moment.We have Absolute pressure= static pressure+ floating operating pressure.

So, how could I manage to this good moment value?

Cordially
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Old   September 7, 2007, 07:57
Default Re: floating operating pressure and monitors force
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Joe
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How will adding a constant to the pressure field change the moment calculated?

If you somehow change the reference pressure with time then simply calculate the relevant moment at the beggining of each timestep?
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Old   September 7, 2007, 08:10
Default Re: floating operating pressure and monitors force
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Lavastre jeremie
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Thanks for answer, but I don't know the floating operating pressure for each time step. Next, The reference value is fixed during the calculation. Then, if we have 2 bars or 1 bar on a wall, it's different for moment value, I may think that I don't understand what you have said.

If you have more details, I will be you grateful.

Sorry for my approximate english
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