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How can I set the inlet pressure?

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Old   August 18, 2003, 15:52
Default How can I set the inlet pressure?
  #1
moon
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For an incompressible flow, I use the velocity inlet and outflow condition. How can I set the inlet pressure(7bar)?
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Old   August 18, 2003, 16:10
Default Re: How can I set the inlet pressure?
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Jason
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In Define --> Operation condition The pressure in boundary condition(if you defined) is based on this pressure, i.e. gauge pressure.
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Old   August 18, 2003, 17:11
Default Re: How can I set the inlet pressure?
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moon
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default value is 1bar in operating pressure. I want to make the pressure 7bar or above is it possible without any treatments
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Old   August 18, 2003, 18:02
Default Re: How can I set the inlet pressure?
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Jason
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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.
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Old   August 18, 2003, 19:08
Default Re: How can I set the inlet pressure?
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moon
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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?
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Old   August 18, 2003, 19:21
Default Re: How can I set the inlet pressure?
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moon
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when I set the material, fluent questions whether overwrite the air or make new material. I made it new. is it wrong?
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Old   August 19, 2003, 10:23
Default Re: How can I set the inlet pressure?
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Rahul Hiwale
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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
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Old   August 19, 2003, 14:17
Default Re: How can I set the inlet pressure?
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moon
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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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