# Pressure Boundary Conditions

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 March 13, 2008, 06:09 Pressure Boundary Conditions #1 Dave Guest   Posts: n/a Dear All, I have searched the forums already and didn't find the solution to the problem I am having. I have a simple case of a 2D channel 45mm long 9mm wide with a pressure-inlet at one end and pressure-outlet at the other. With a pressure difference of 1000Pa between inlet and outlet, the theoretical mass flow is 27kg/s. However, setting Total guage pressure at inlet to 1000Pa and total pressure at outlet to 0Pa Fluent predicts a mass flow of ~10kg/s. I understand Fluent's total pressure is a combination of hydrostatic and dynamic pressure. No gravity is involved in this simulation - it is just a pure laminar test case to validate another model but Fluent seems unable to solve. Thank-you in advance for any suggestions, Dave

 March 13, 2008, 23:15 Re: Pressure Boundary Conditions #2 Sellyg Guest   Posts: n/a You can do the follwing: 1) use velocity bc instead pressure inlet; 2) after processing, you can read the pressure value at inlet.

 June 8, 2009, 17:05 #3 New Member   Ravi Kapoor Join Date: May 2009 Posts: 6 Rep Power: 10 Hi, Even I am getting the same problem when I use pressure conditions at the boundary and the problem seems to be resolved when I use velocity inlet at the inlet boundary condition.. Bt I am unable to explain the reason for difference in results with these two different boundary conditions? Please help.

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