CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   what is meant by Operating Pressure in Fluent? (

mifrah March 9, 2013 04:51

what is meant by Operating Pressure in Fluent?
hello all,
i am a new user in Fluent.
i want to know what exactly is meant by operating pressure in fluent?
its default value is 101325 pa, is it atmospheric pressure? but sometime we also assume 0 as operating pressure, its making me feel dizzy....
what will be the operating pressure in 10 meter depth of a pool?

blackmask March 9, 2013 06:40

It depends on how you model the density. It is always valid to set the operating pressure to (approximately) the mean pressure of the flow field. But it is only when you model the density using incompressible ideal gas law, or you are dealing with low-Mach-number compressible flow that the value of operating pressure is important.

The operating pressure is not used if the density is modeled to be constant.

You should check the Fluent user manual because it has more detailed and accurate description of the operating pressure.

mifrah March 9, 2013 13:38

in my case density is constant so it means i can take operating pressure as zero??????

farzadpourfattah March 9, 2013 16:16

dear ....
when you set pressure of operation condition 0 pascal, you prevent reverse flow in your domain.

blackmask March 10, 2013 02:15

Yes. You can set operating pressure to any value because it is not used in case of constant density.

mifrah March 12, 2013 15:02

Thank you :rolleyes:

flow_CH June 8, 2013 12:13

what is that value in VOF model? (water+air)

farzadpourfattah June 15, 2013 11:27

if you set value of water 1 in a zone,value of air will be 0 at same zone.

All times are GMT -4. The time now is 19:03.