# Boundary Condition Total Pressure for Beginners

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 August 26, 2020, 09:16 Boundary Condition Total Pressure for Beginners #1 Member     Simon Join Date: Sep 2019 Location: Germany Posts: 52 Rep Power: 3 Hello, In my simulation the outlet-boundary is like this: Code: ``` { type totalPressure; uniform 0; p0 0; }``` So it is athmospheric pressure at the outlet. What if I rather want to have the same pressure outlet with 100 Pa instead of atmospheric pressure? Is it true that the Code: `uniform 0;` describes the initial pressure at t=0 and Code: `p0 0;` describes the pressure at the outlet duiring the simulation? If no, what are they standing for? Thank you Simon

 August 26, 2020, 13:56 #2 Member   Thiago Parente Lima Join Date: Sep 2011 Location: Diamantina, Brazil. Posts: 53 Rep Power: 11 Hi Simon, I think this link may help you. Code: `p0 uniform 0;` means that you are setting the value of 0 uniformly at your boundary patch (zero at the whole boundary patch). The solver will use this value and the velocity at this boundary to calculate the static pressure, as the equation in the link describes. Regards. __________________ Fields of interest: Heat transfer; Convection heat transfer; Conjugate heat transfer.

 Tags boundary, condition, totalpressure