# Angle of attack not changed

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 March 21, 2013, 05:48 Angle of attack not changed #1 Member   AndreiCFD Join Date: Nov 2012 Posts: 47 Rep Power: 12 Hi Foamers I am simulating the flow over NACA23012 and it seems that when i change the angle of attack i am getting the same results. for example i changed from 0 deg to 5 deg using the Velocity*cos(angle) in x direction and Velocity*sin(angle) for y direction but the results seems to be the same even after i defined the angle of attack ..weird............. Might my inlet faces....what do you think? Any suggestions......? Thanks

 March 21, 2013, 06:14 #2 Super Moderator     Alex Join Date: Jun 2012 Location: Germany Posts: 3,308 Rep Power: 44 What does your computational domain look like? What other boundary conditions do you have besides the velocity inlet? A sketch or even a screenshot might be helpful. And which soler are you using?

March 21, 2013, 06:33
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AndreiCFD
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Quote:
 Originally Posted by flotus1 What does your computational domain look like? What other boundary conditions do you have besides the velocity inlet? A sketch or even a screenshot might be helpful. And which soler are you using?

below i attached my sketch and sorry for the poor quality but you can understand ... I am using k omega sst and simpleFoam. solver
the wall represents my domain ... The inlet is defined 10 meters away from the wall and the outlet is defined 15 m away from the trailing edge.......

Thanks again
Attached Images
 domain.jpg (75.2 KB, 15 views)

 March 21, 2013, 07:41 #4 Senior Member   Lefteris Join Date: Oct 2011 Location: UK Posts: 327 Rep Power: 14 And the chord length is? I mean, if the chord is 1m in length I believe the boundaries are too close. They should be at approximately 20c away. Something else, I don't know how openfoam works, but you should check whether it uses angles in degrees or in rads. __________________ Lefteris

 March 21, 2013, 08:04 #5 Super Moderator     Alex Join Date: Jun 2012 Location: Germany Posts: 3,308 Rep Power: 44 Just like I thought... The straight boundaries (symmetry I guess) at the top and bottom of your domain guide the flow towards an AoA of 0°. No matter what you specify at the inlet.

 March 24, 2013, 09:50 #6 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,552 Blog Entries: 6 Rep Power: 53 Yes for AOA study you should modify domain to circular at inlet and boundaries should be placed at 15-20 C at inlet and 25-30 C at outlet.

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