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-   -   Negative volumes (http://www.cfd-online.com/Forums/fluent/44185-negative-volumes.html)

Christie March 20, 2007 23:38

Negative volumes
 
Hello,

As part of my Aircraft Design Project I am doing CFD on an NLF airfoil with varying AoAs and Aileron/Flap settings. The airfoil with 0 aileron and flap deflection works fine - meshed and ran in fluent without errors. My problem is with the airfoils with aileron and flap deflections.

I meshed the airfoil with a -2 deg deflection of the aileron the similar to how I did the airfoil with no deflection, however when checking the grid in fluent with the meshed airfoil with aileron deflection I get a Failed grid check error due to negative volumes.

Are there any suggestions as to how I may remedy this? What I have tried thus far is changing the mesh size/type with no luck.

Thanks in advance!

Rohan March 29, 2007 02:49

Re: Negative volumes
 
Hi,

Check the skewness of the face meshes.

Try to bring them down below .7

Should work fine.

Thanks

Regards

Rohan

Christie March 29, 2007 08:46

Re: Negative volumes
 
Thanks for the response. I've actually figured it out a while a go and have moved on from the airfoil to the fuselage.

Thanks again though :)


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