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  • 7 Post By Anthony Wachs

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Old   August 29, 2001, 23:48
Default hydrostatic pressure
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Hi! In FLUENT, do the viscous models take care of the hydrostatic pressure? for exp, i have a close basin without any inflow and outflow, just run the laminar model, i can not observe the hydrostatic pressure distribution in the vertical direction. Anybody can help?
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Old   August 30, 2001, 00:34
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A) Have you considerd g ? gradivational accelation ? B) Put a right value and direction in operating conditons C) Solve again, and check the hydrostatic pressure now.

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Old   August 30, 2001, 01:53
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yes. i have already turn the gravity on. but the pressure appears to be zero
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Old   August 30, 2001, 02:10
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John C. Chien
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(1). Can you get a sample case from the vendor? (2). If what you are saying is true, then you must be on the ISS (space station), or there is a black hole somewhere.
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Old   August 30, 2001, 04:53
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Anthony Wachs
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I already experienced that frustrating situation but I finally found the answer. The reason why you did not manage to see the hydrostatic pressure distribution might probably be the fact that you did not specify the operating density. To see the hydrostatic pressure distribution, you are to specify a operating density of 0. Actually, the operating density is a kind of reference density used by the solver to take into account the gravity source term, that can be written as :


where ro(fluid)=density of the fluid you consider

ro(oper)= operating density

g=gravity acceleration


By defaults, if you do not specify ro(oper), the solver takes the same value as the fluid considered, e.g. ro(oper)=ro(fluid), then your gravity source term vanishes. That's why you could not see the hydrostatic pressure distribution. If you set ro(oper)=0, it will work !!

Hope it might help

wwa, FJSJ, pezarello86 and 4 others like this.
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Old   September 3, 2001, 04:23
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Der Anthony, Thank you very very much! I solve the problems with your help!

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Old   April 20, 2016, 11:00
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Baptiste Calmette
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Thank you very much!!! I have tried to solve this problem and thanks to your tip I solved it. I really appreciate it.
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