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Old   May 17, 2012, 01:54
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samrat himvanth nanduri
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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..
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Old   May 17, 2012, 02:59
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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)

Last edited by Far; May 17, 2012 at 05:11.
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Old   May 17, 2012, 03:13
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Quote:
Originally Posted by Far View Post
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,,,
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Old   May 17, 2012, 03:36
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At : Inlet velocity (incompressible flow) OR pressure far field (compressible flow)
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Old   May 17, 2012, 04:51
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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
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Old   May 17, 2012, 04:58
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Need to check it. But you can rotate your model in Fluent.
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Old   May 17, 2012, 05:03
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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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