# what is meant by Operating Pressure in Fluent?

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 March 9, 2013, 04:51 what is meant by Operating Pressure in Fluent? #1 New Member   Mifrah Ali Join Date: Mar 2013 Posts: 3 Rep Power: 5 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?

 March 9, 2013, 06:40 #2 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 13 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.

 March 9, 2013, 13:38 #3 New Member   Mifrah Ali Join Date: Mar 2013 Posts: 3 Rep Power: 5 in my case density is constant so it means i can take operating pressure as zero??????

 March 9, 2013, 16:16 dear .... #4 Member   farzadpourfattah Join Date: Mar 2013 Posts: 41 Rep Power: 5 when you set pressure of operation condition 0 pascal, you prevent reverse flow in your domain.

 March 10, 2013, 02:15 #5 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 13 Yes. You can set operating pressure to any value because it is not used in case of constant density.

 March 12, 2013, 15:02 #6 New Member   Mifrah Ali Join Date: Mar 2013 Posts: 3 Rep Power: 5 Thank you

 June 8, 2013, 12:13 #7 Senior Member   Saeed Join Date: Jan 2013 Posts: 177 Rep Power: 5 what is that value in VOF model? (water+air)

 June 15, 2013, 11:27 vof #8 Member   farzadpourfattah Join Date: Mar 2013 Posts: 41 Rep Power: 5 if you set value of water 1 in a zone,value of air will be 0 at same zone.

June 6, 2016, 12:57
#9
New Member

rizky djon hansemit
Join Date: Mar 2016
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Quote:
 Originally Posted by blackmask 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.

can you tell us how do we know the mean pressure of the flow field in fluent. in my case i simulate 2d vawt in a wind tunnel. is there any consideration when we want to specify certain value of operating condition in fluent for incompressible ideal gas air. what about reference pressure location? its default value is [0,0,0]. how to specify the right reference pressure location in our simulation? please help us

 June 12, 2016, 17:49 #10 New Member   rizky djon hansemit Join Date: Mar 2016 Posts: 2 Rep Power: 0 is there any help?

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