# Pressure distribution over an airfoil-help

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 January 11, 2002, 09:21 Pressure distribution over an airfoil-help #1 Andrew Parker Guest   Posts: n/a Dear all I am having a problem with the pressure distribution over the surface of an airfoil. I have my own experimental data for lift, drag, and pressure distribution. The flow over the airfoil is separated in real life, and I have it separated in fluent. I have the lift accurate and the drag accurate but the pressure distribution constructed through xy plots is well off. I don't understand how the lift, and drag can be accurate but the pressure is wrong. I am plotting static pressure against the distance along he airfoil. Has anybody had this problem? What was the remedy? Do I need to use surface integrals to work out the pressure distribution? Could it be to with reference pressures? I have set the gauge pressure on the pressure outlet boundary to zero. The wind tunnel discharges to atmosphere so this is correct, or is it? The operating pressure is 1 atmosphere. But the reference location (0,0) happens to coincide with the leading edge of the airfoil, does this matter? Need help, a lot of it please!!! Cheers Andy

 January 15, 2002, 12:32 Re: Pressure distribution over an airfoil-help #2 anony Guest   Posts: n/a I hope you might be looking at the pressure coefficient values rather than the static pressure values. Did the experimental xy plot has the nondimensional units, if so they are pressure coefficients. Try out the pressure coefficients for xy plot.

 January 15, 2002, 13:11 Re: Pressure distribution over an airfoil-help #3 Andrew Parker Guest   Posts: n/a Thanks, but that's not the answer the experimental data is my own from a wind tunnel and all the pressure are just static. Cheers anyway Andy

 January 17, 2002, 00:02 I also have this trouble. #4 belldingding Guest   Posts: n/a if you know,please tell me.

 February 13, 2002, 12:51 Re: I also have this trouble. #5 Lakshmanagouda. .G.patil Guest   Posts: n/a just see whether you are using cell values or node values. try by changing the node values on and off in xy -plot good luck

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