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-   -   How can I set the inlet pressure? (http://www.cfd-online.com/Forums/fluent/31989-how-can-i-set-inlet-pressure.html)

moon August 18, 2003 15:52

How can I set the inlet pressure?
 
For an incompressible flow, I use the velocity inlet and outflow condition. How can I set the inlet pressure(7bar)?

Jason August 18, 2003 16:10

Re: How can I set the inlet pressure?
 
In Define --> Operation condition The pressure in boundary condition(if you defined) is based on this pressure, i.e. gauge pressure.

moon August 18, 2003 17:11

Re: How can I set the inlet pressure?
 
default value is 1bar in operating pressure. I want to make the pressure 7bar or above is it possible without any treatments

Jason August 18, 2003 18:02

Re: How can I set the inlet pressure?
 
sure you can change it directly. Bearing in mind that the pressure will change gas density and hence velocity if you are using mass_flow_inlet and defining material density as incompressible ideal gas.

moon August 18, 2003 19:08

Re: How can I set the inlet pressure?
 
I define material density as incompressible ideal gas. when I set the operating pressure 7bar, density become 7times higher than that of 1bar. I just want to use air under the 7bar pressure. How can I make it?

moon August 18, 2003 19:21

Re: How can I set the inlet pressure?
 
when I set the material, fluent questions whether overwrite the air or make new material. I made it new. is it wrong?

Rahul Hiwale August 19, 2003 10:23

Re: How can I set the inlet pressure?
 
Hi Moon, If you need density of air at 1 bar then use constant density and give operating pressure as 7 bar. You can also use inlet pressure bc in that case use pressure as 7 bar + kinetic pressure (1/2.rho.v2) for incompressibale flow.

Fluent won't ask you to overwrite unless you change fluid/solid name. If you overwrite it will set that new mateial as default material instead of old material.

Rahul

moon August 19, 2003 14:17

Re: How can I set the inlet pressure?
 
Thank you and Jason for your answer. If I have a problem with property variation(air) due to high heat flux and can't use constant density, what must I do? I use an incompressible ideal gas law for density and other properties as a function of temperature. all properties varies mainly with temperature. I use a segregated solver, not coupled. is it wrong?


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