# CFX-Post: How to calculate pressure loss for Airfoil?

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 April 14, 2014, 09:36 CFX-Post: How to calculate pressure loss for Airfoil? #1 New Member   Join Date: Jan 2014 Posts: 2 Rep Power: 0 Hello everyone, I am having troubles to calculate the pressure loss for my simulation as I get negative results. I am using mesh similar to this one and want to calculate the pressure loss for different angles of attack. So when I try to apply this formula (p.total.1-p.total.2)/p.dynamic.1 by this: =(areaAve(Total Pressure)@inlet -areaAve(Total Pressure)@outlet )/(0.5*areaAve(Density)@inlet*areaAve(Velocity)@inle t^2) than for some cases I get this: areaAve(Total Pressure)@inlet < areaAve(Total Pressure)@outlet and therefore negative pressure loss values. For Clarification: inlet = circular arc outlet = vertical line I use diffrent velocity_u and velocity_v components to realizre the different angles. Any Idea, what I am doing wrong?

 April 14, 2014, 15:02 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 501 Rep Power: 11 I suspect it has to do with the curved nature of your inlet and how you are defining your velocity. Also, switch to massFlowAve(Total Pressure)

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