# pressure not uniform although velocity is uniform at the inlet

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 January 11, 2011, 05:25 pressure not uniform although velocity is uniform at the inlet #1 New Member   sm Join Date: Jun 2009 Posts: 15 Rep Power: 10 Dear all, I specify the inlet velocity for a multiphase system ( one liquid and two granular solids) but when I simulate I find that the pressure is not uniform across the cross-section of the inlet. Could anybody say why is it so. thanx sm Skabirian likes this.

 March 6, 2016, 04:58 #2 New Member   Siavash Join Date: Nov 2013 Posts: 14 Rep Power: 5 I have the same problem can anybody help?

 March 6, 2016, 11:07 #3 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,886 Rep Power: 26 If you have a viscous flow, pressure does not have to be uniform and in general is not uniform. If you have a uniform velocity inlet it is unlikely to be uniform. Skabirian likes this.

 March 7, 2016, 04:35 #4 New Member   Siavash Join Date: Nov 2013 Posts: 14 Rep Power: 5 I want to calculate CP on the airfoil reference pressure in pressure at infinity if its changed, CP changed too. is this correct?

 March 7, 2016, 08:50 #5 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,886 Rep Power: 26 The reference pressure is part of the definition of Cp. Meaning it is defined as soon as you have chosen a particular definition for Cp. But, the reference pressure is usually the dynamic pressure. Skabirian likes this.

 March 7, 2016, 09:46 #6 New Member   Siavash Join Date: Nov 2013 Posts: 14 Rep Power: 5 so, if i want to plot cp ,what will be the pressure (pa) in reference values ?

 March 7, 2016, 13:57 #7 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,886 Rep Power: 26 How do you define Cp? The reference pressure is there. Are you asking what is the definition of Cp? Skabirian likes this.

 March 8, 2016, 01:19 #8 New Member   Siavash Join Date: Nov 2013 Posts: 14 Rep Power: 5 p-p(inf)/q(inf) p(inf) is defined in reference pressure and is changed during the solution because of velocity inlet BC.

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