Setting up static pressure

singingfish · April 12, 2014, 09:06

Hi everyone, I'm relatively new to using CFX and I need some assistance with setting up the static pressure in the fluid domain.
I want to set the static pressure of my domain to that of the underwater pressure, ie. Atmospheric + rho*g*z where the variable in this equation is z. So my question is, where do I key in this equation? Is it under initialization>static pressure>relative pressure?
Any help is greatly appreciated. Thanks

Abou ali · April 12, 2014, 16:35

First, create an expression “main menu->insert->expression”, and then use it in the domain initialization.

ghorrocks · April 13, 2014, 07:38

Abou describes how to add an equation.

But my question is why do you want to do this? If you read the documentation you will find in a buoyant simulation the pressure variable already have the hydrostatic component removed from it. The absolute pressure contains the hydrostatic component (and the reference pressure offset).

April 12, 2014, 09:06	Setting up static pressure	#1
singingfish New Member Glenn Ong Join Date: Jan 2014 Posts: 3 Rep Power: 14	Hi everyone, I'm relatively new to using CFX and I need some assistance with setting up the static pressure in the fluid domain. I want to set the static pressure of my domain to that of the underwater pressure, ie. Atmospheric + rhogz where the variable in this equation is z. So my question is, where do I key in this equation? Is it under initialization>static pressure>relative pressure? Any help is greatly appreciated. Thanks

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April 12, 2014, 16:35		#2
Abou ali Member Join Date: Nov 2009 Posts: 49 Rep Power: 18	First, create an expression “main menu->insert->expression”, and then use it in the domain initialization.

April 13, 2014, 07:38		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	Abou describes how to add an equation. But my question is why do you want to do this? If you read the documentation you will find in a buoyant simulation the pressure variable already have the hydrostatic component removed from it. The absolute pressure contains the hydrostatic component (and the reference pressure offset).