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 Liwau March 7, 2004 21:56

Static Pressure & Hydrostatic Pressure

Dear all,

What's the difference between Static (Thermodynamic) Pressure and Hydrostatic Pressure? Any example or some equations to show the difference?

Liwau

 Vistor March 9, 2004 04:17

Re: Static Pressure & Hydrostatic Pressure

Helloo,, I'm not an experince person, however I think the hydrostatic pressure is related to stationary liduid whereas the static is dealing with gases in closed container. I may be wrong! Let's hear from the rest

 Glenn Horrocks March 9, 2004 19:05

Re: Static Pressure & Hydrostatic Pressure

Hi Liwau,

Static pressure is the pressure of the fluid at that point. Total pressure is static pressure plus the dynamic head (0.5*density*V^2), and represents the static pressure which would result if a moving fluid was brought to rest with no losses - the pressure would increase due to Bernoulli. Hydrostatic pressure is the pressure in a fluid due to the weight of fluid above it, for instance air pressure is a result of the weight of air in the atmosphere above you.

In CFX, static and total pressures are available in CFX-Post. Hydrostatic pressure is only applicable when you have defined a gravity vector, and this is usually for a natural convection simulation.

Regards, Glenn

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