# important problem

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 August 10, 2012, 15:00 important problem #1 New Member   Join Date: Dec 2011 Posts: 10 Rep Power: 7 Sponsored Links Hi dear friends l have an important problem about fluent in modeling a spillway.in results i see negative pressure which is not correct.as a matter of fact,pressure must be positive.on slope,pressure must begin with positive mesure and change along the spillwau.but in my results ,pressure begins with negative mesure.i don't know what the problem is!

 August 10, 2012, 17:17 #2 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 94 Rep Power: 9 When you select Pressure, select also Absolute pressure instead of Static Pressure which is chosen by default

 August 11, 2012, 13:20 #3 New Member   Join Date: Dec 2011 Posts: 10 Rep Power: 7 Thanks I try that.but it doesn't work.pressure is still negative.the velocity measures are correct.do you think modeling in gambit is wrong?or is there any special setting in fluent which is effective? Thank you very much

 August 11, 2012, 13:46 #4 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 94 Rep Power: 9 I don't think it's about the mesh. How did you set your boundary conditions specially for pressure and your Operating Conditions?

 August 11, 2012, 14:05 #5 New Member   Join Date: Dec 2011 Posts: 10 Rep Power: 7 For example:in a simple model consist of a simple slope,i use : Velocity inlet as input pressure out let as output Symetry Wall.

 August 11, 2012, 14:10 #6 New Member   Join Date: Dec 2011 Posts: 10 Rep Power: 7 Operating pressure is 101325 And also i apply variable density parameter 1.225

 August 13, 2012, 03:46 #7 New Member   Join Date: Apr 2012 Posts: 20 Blog Entries: 3 Rep Power: 7 To know the reason, you may check these in sequence. -pressure outlet is the same as you set. -pressure drop between inlet and outlet is reasonable. if this result is available, you then check your simplification model. Maybe there some different between the real model and the simulation model new anne likes this.

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