# Airfoil Coordinates

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 January 19, 2008, 21:33 Airfoil Coordinates #1 Usman Guest   Posts: n/a Sponsored Links Hi Guys How can i find the coordinates of an airfoil at different angle of attacks. I want to simulate a flow over a NACA 0018 airfoil but i have coordinates for it only at 0 degree angle of attack. I need to get its coordinates @ 3, 9 and 12 degrees angles of attack? Thanks in advance Regards Usman

 January 19, 2008, 22:03 Re: Airfoil Coordinates #2 ag Guest   Posts: n/a Rotate the airfoil. The transformation can be found in any number of references. Or rotate the freestream flow vector.

 January 19, 2008, 22:19 Re: Airfoil Coordinates #3 Usman Guest   Posts: n/a Can you explain in a bit more detail how can i rotate the airfoil. What do you mean by number of refernce? I will not be able to use freestream flow vector in my case! Thanks Usman

 January 20, 2008, 06:27 Re: Airfoil Coordinates #4 A.K. Guest   Posts: n/a In order to rotate each given point of your airfoil, use simple formulae available, e.g., at http://en.wikipedia.org/wiki/Rotation_(mathematics)

 January 20, 2008, 06:37 Re: Airfoil Coordinates #5 Usman Guest   Posts: n/a Thanks AK i will look into it! Usman

 January 23, 2008, 16:41 Re: Airfoil Coordinates #6 Usman Guest   Posts: n/a Which formulas exactly are we suposse to use to find the co-ordinates for airfoil at an angle of incidence. I am very confused here. Usman

 January 24, 2008, 07:43 Re: Airfoil Coordinates #7 A.K. Guest   Posts: n/a Let (x,y) be the frame of reference in which the inflow velocity is (U,0), and (x',y') be coordinates of an airfoil point. Now if you rotate the point (x',y') with respect to (x,y) clockwise at an angle "alpha" then x= x'cos(alpha)+y'sin(alpha); y= -x'sin(alpha)+y'cos(alpha)

 January 24, 2008, 07:53 Re: Airfoil Coordinates #8 Usman Guest   Posts: n/a Thank you very much AK. Regards Usman

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