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CFD of Wing on fixed Angle of Attack

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Old   August 2, 2013, 15:00
Default CFD of Wing on fixed Angle of Attack
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Hi guys I would like do make a CFD to evaluate the lift on a Wing of a little airplane ( the area of this wing is around 1 m^2). But I need to make the analyses on AOA =4.5 deg this is my problem!

I'm using CFX and I've Already created the enclosure around the Wing and the mesh too. I've used expressions on CFX to define AOA and the initial velocity (actually the velocity is a constant). And I've defined Ux e Uy the velocity o axis X and Y Ux = velocityXcos(AOA)
Uy =velocityXsin(AOA)

but every time that I put this program to run something wrong happened. and the simulations is stopped

someone have an idea? let me know it
Please I need help!!!
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Old   August 2, 2013, 15:24
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Sijal Ahmed Memon (turboenginner@gmail.com)
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What type of error message you are getting?
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Old   August 2, 2013, 22:13
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What type of error message you are getting?
The ANSYS CFX solver exited with return code 1. No results file has been
created.
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Old   August 3, 2013, 00:11
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I think something is wrong in the boundary conditions or initialization.
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Old   August 3, 2013, 03:04
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CFX gives you information on grid quality. Angle should be >18 and two more parameters.

1. check these quality metrics for mesh.

2. Check scaling of domain. In other words, if you have have made the geometry in mm, again you must have same units after importing mesh to CFX Pre.

3. Boundary conditions. Check them carefully. Especially while defining the angle of attack.

4. Are you using auto time scale?
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Old   August 3, 2013, 09:48
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Quote:
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CFX gives you information on grid quality. Angle should be >18 and two more parameters.

1. check these quality metrics for mesh.

2. Check scaling of domain. In other words, if you have have made the geometry in mm, again you must have same units after importing mesh to CFX Pre.

3. Boundary conditions. Check them carefully. Especially while defining the angle of attack.

4. Are you using auto time scale?

Yes I'm using auto time scale, I couldan't? Boundary conditions Ive difined Inlet as u = Ux
V = Uy
W = 0
Outlet = 0 Pa
and the other surfaces including de surface of the wing as Wall.
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Old   August 3, 2013, 09:51
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Another informations guys when I use just one velocity in Inlet boundary as 20m/s the simulations no problem!!!
Someone have a tutorial for me ?
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Old   August 4, 2013, 07:09
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CFX comes with tutorials, the ANSYS Customer page has more and CFX support has even more examples.
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