Hi, we have been trying to mesh half a 3d aeroplane in Gambit for weeks now and have searched the forum and still can't get our problem solved; Please Help.

We have done tutorial 12 and it worked perfectly. We then applied this tutorial information to our aircraft and it worked, but when we imported the mesh into Fluent, some nodes are not used. We do get results but we are getting very high lateral forces (i.e. through the symmetry plane). We would expect this to be 0.

We are now trying to subtract the half aircraft volume from the brick volume to give one volume as in tutorial 6. When we mesh it now we get an error message saying: 'tetrahedral mesh has failed for volume v_volme.4. This is usually caused by problems in the face meshes. Check for skewness of the face meshes. Make sure the face mesh sizes are not too large in areas of small gaps'.

What would you suggest we do? Please help, we are in real trouble.

I thank you in advance for any help!

Cheers, George

Do you clean your geometry before meshing?

Hi HVN,

Yes we have done clean ups. I guess there might me a problem with there being virtual volumes, i.e. non-real.

??

Thanks

I have sometimes this pb when I have very small surface compared to the global geometry

ok thanks for that!

Cheers George

Hi, While modelling flow over aeroplane how do you decide on the size of external domain. Is there any atandard practice to decide on domain size ?

Thanks Venkatesh.V