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 samcfd May 17, 2012 01:54

3D Wing

HI could any1 help me on how to assign pitch and yaw angles in fluent while running a simulation over a 3D wing. I want to assign both these values at the same time..

 Far May 17, 2012 02:59

Let say fuselage is in X-Y plane and wings along the Z-direction. In this case logntitudal axis is X and vertical one is Y. The Z-axis is pointing out of X-Y plane.

Pitch angle = alpha
Yaw angle = beta

Formulae are:

Case 1: Only alpha (Beta = 0)
X = Cos (alpha)
Y = Sin (alpha)
Z = 0

Case 2 : Only Beta (Alpha = 0)
X = Cos (Beta)
Y = 0
Z = Sin (Beta)

Case 3 : Both Alpha and Beta (360 model)
X = Cos (alpha) cos (Beta)
Y = Sin (Alpha)
Z = Cos (alpha) sin (Beta)

http://en.wikipedia.org/wiki/Axis-angle_representation
http://en.wikipedia.org/wiki/Yaw,_pi...93Bryan_angles
http://en.wikipedia.org/wiki/Flight_...wing_aircraft)

 samcfd May 17, 2012 03:13

Quote:
 Originally Posted by Far (Post 361577) Let say fuselage is in X-Y plane and wings along the y-direction. In this case logntitudal axis is X and vertical one is Y. The Z-axis is pointing out of X-Y plane. Pitch angle = alpha Yaw angle = beta Formulae are: Case 1: Only alpha (Beta = 0) X = Cos (alpha) Y = Sin (alpha) Z = 0 Case 2 : Only Beta (Alpha = 0) X = Cos (Beta) Y = 0 Z = Sin (Beta) Case 3 : Both Alpha and Beta (360 model) X = Cos (alpha) cos (Beta) Y = Sin (Alpha) Z = Cos (alpha) sin (Beta) http://en.wikipedia.org/wiki/Axis-angle_representation http://en.wikipedia.org/wiki/Yaw,_pi...93Bryan_angles http://en.wikipedia.org/wiki/Flight_...wing_aircraft)

Thank you for the reply...it was really grateful..I wanted to ask you of where to apply these formulas.. in the boundary conditions while setting the inlet velocities or at any other place,,,

 Far May 17, 2012 03:36

At : Inlet velocity (incompressible flow) OR pressure far field (compressible flow)

 samcfd May 17, 2012 04:51

hi thanks..i'm finding it a bit difficult assigning the values..cold you pls let me know the formula while the wing is in the Z direction

 Far May 17, 2012 04:58

Need to check it. But you can rotate your model in Fluent.

 Far May 17, 2012 05:03

Quote:
 formula while the wing is in the Z direction
Leading/trailing edge is parallel to Z axis? If yes, then same formulae are valid.

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