hydrostatic pressure
 

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?

Re: hydrostatic pressure
 

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.

DC

Re: hydrostatic pressure
 

yes. i have already turn the gravity on. but the pressure appears to be zero

Re: hydrostatic pressure
 

(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.

Re: hydrostatic pressure
 

Hi,

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 :

(ro(fluid)-ro(oper))*g*V

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

ro(oper)= operating density

g=gravity acceleration

V=volume

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

Anthony

Re: hydrostatic pressure
 

Der Anthony, Thank you very very much! I solve the problems with your help!

Thank you very much!!! I have tried to solve this problem and thanks to your tip I solved it. I really appreciate it. :)