about function calculator

extinguisher · June 2, 2010, 10:46

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

ghorrocks · June 2, 2010, 19:35

And your question is......

extinguisher · June 4, 2010, 03:01

the result （-2.08692N）of the X component was right or wrong？

ghorrocks · June 4, 2010, 09:21

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.

extinguisher · June 6, 2010, 04:46

I simulated a three-dimensional flow around the wing, angle of attack from 0 degrees to completely stall.

ghorrocks · June 6, 2010, 07:23

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.

June 2, 2010, 10:46	about function calculator	#1
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 17	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

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June 2, 2010, 19:35		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,001 Rep Power: 146	And your question is......

June 4, 2010, 03:01		#3
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 17	the result （-2.08692N）of the X component was right or wrong？

June 4, 2010, 09:21		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,001 Rep Power: 146	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, 04:46		#5
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 17	I simulated a three-dimensional flow around the wing, angle of attack from 0 degrees to completely stall.

June 6, 2010, 07:23		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,001 Rep Power: 146	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.