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 June 2, 2010, 09:46 about function calculator #1 New Member   Join Date: May 2010 Posts: 8 Rep Power: 7 The AoA is 12 degree，velocity is 10m/s function calculator.jpg the X component force of the wing finally increases the Lift force and decreases the Drag force

 June 2, 2010, 18:35 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,923 Rep Power: 85 And your question is......

 June 4, 2010, 02:01 #3 New Member   Join Date: May 2010 Posts: 8 Rep Power: 7 the result （-2.08692N）of the X component was right or wrong？

 June 4, 2010, 08:21 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,923 Rep Power: 85 Are you asking if the force in the X direction is -2N - sounds wrong to me as the drag should be in the + direction, but I have no idea what you are modelling so cannot be sure.

 June 6, 2010, 03:46 #5 New Member   Join Date: May 2010 Posts: 8 Rep Power: 7 I simulated a three-dimensional flow around the wing, angle of attack from 0 degrees to completely stall.

 June 6, 2010, 06:23 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,923 Rep Power: 85 If you are running steady state then you have not run it to convergence. If you are running transient and you are near stall it is quite possible the airfoil will have short periods of negative drag. Averaged over time the drag will be positive.

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