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Drag and Lift forces extremely low

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Old   January 19, 2008, 08:00
Default Drag and Lift forces extremely low
  #1
João Lourenço
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I am trying to perform an aerodynamic characterization of an aircraft. I created an unstructured mesh using Ansys ICEM and imported it to Fluent. The mesh is relatively good but still has a small number of bad quality cells.

I ran a case using an AOA of 6 degrees and monitored the residuals, including turbulent quantities and both CL and CD. The results I got for CL and CD were extremely low. For CL around 10E-4 and CD around 10-5.

I've checked that the scaling of the mesh was correct, the references values were also correct, the boundary conditions were well defined, the force vectors were OK and that the surfaces I am monitoring the forces on were just the ones on the aircraft surface.

I ran out of ideas! Can anyone please help me?

Thank you in advance for your patience and time spent reading this long post.

Regards, Joo
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Old   January 19, 2008, 18:04
Default Re: Drag and Lift forces extremely low
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bharat
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check the units
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Old   January 19, 2008, 18:19
Default Re: Drag and Lift forces extremely low
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João Lourenço
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I checked the units too.

Thanks anyway!
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Old   January 19, 2008, 18:39
Default Re: Drag and Lift forces extremely low
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Sham
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I suggest that you model in Gambit using metres.

Sham.
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Old   January 28, 2008, 14:25
Default Re: Drag and Lift forces extremely low
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bachi
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i too found the same problem now, if you got any solution for this please help me.

Thank you in advance if have a solution.

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