Hydrostatic Pressure

February 19, 2002, 12:22

Hi All Does anyone know how CFX-4.4 deals with hyfrostatic pressure in environmental flows. Is driving me crazy!! Thanks in advance

February 21, 2002, 10:31

Rhydar

Just put bouyancy with it is multiphase or includes as a body force the -rho*g term in the source of momentum equation.

Regards

February 27, 2002, 11:12

Thanks Ribeiro Didn't quite understand though. Does CFX4.4 attomatically calc. the hydrostatic pressure in if you specify the buoyancy vector in the command file, or does one have to add the source term -rho*g in a USR routine as an extra term? And if so, what happens to the gravity vector?? Still confused, but getting there!!

March 6, 2002, 10:54

If your problem is 1 phase then you should enter the gravity force through USRBF (it is quite easy!). If you have 2 or more phases then it can be done by bouyancy. Indeed the bouyancy (due to gravity) only exits between two fluids.

I hope it is clear now.

Regards

February 19, 2002, 12:22	Hydrostatic Pressure	#1
Rhydar Guest Posts: n/a	Hi All Does anyone know how CFX-4.4 deals with hyfrostatic pressure in environmental flows. Is driving me crazy!! Thanks in advance

February 21, 2002, 10:31	Re: Hydrostatic Pressure	#2
Ribeiro Guest Posts: n/a	Rhydar Just put bouyancy with it is multiphase or includes as a body force the -rho*g term in the source of momentum equation. Regards

February 27, 2002, 11:12	Re: Hydrostatic Pressure	#3
Rhydar Guest Posts: n/a	Thanks Ribeiro Didn't quite understand though. Does CFX4.4 attomatically calc. the hydrostatic pressure in if you specify the buoyancy vector in the command file, or does one have to add the source term -rho*g in a USR routine as an extra term? And if so, what happens to the gravity vector?? Still confused, but getting there!!

March 6, 2002, 10:54	Re: Hydrostatic Pressure	#4
Ribeiro Guest Posts: n/a	If your problem is 1 phase then you should enter the gravity force through USRBF (it is quite easy!). If you have 2 or more phases then it can be done by bouyancy. Indeed the bouyancy (due to gravity) only exits between two fluids. I hope it is clear now. Regards

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