| Author | Message | ||||
     Svitlana Subota (photinka) Member Username: photinka Post Number: 5 Registered: 02-2007 |
When I use "transfermesh('transfer_U0_3D.dat',U1)" I get an error "cell 2829 is inverted". What is the problem if the geometry is the same in both (output and input) programs? | ||||
| Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 113 Registered: 07-2007 |
If you post the output and input scripts, we can take a look at this. | ||||
| Svitlana Subota (photinka) Member Username: photinka Post Number: 6 Registered: 02-2007 |
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| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1218 Registered: 06-2003 |
I believe the trouble stems from the fact that you have a plane surface and a spherical surface becoming tangent at the top center. This kind of gradual approach to tangency is difficult for the mesh generator to deal with. In this particular case, I think that on read-in, roundoff error is making the zero-thickness points appear to have crossed. There are several ways you can deal with this: 1) increase the thickness of the top layer so the top surface is not tangent to the sphere. 2) place a circular void patch at the top center, so that all mesh cells have non-zero thickness. (radius=4e-4 seems to do the job). 3) truncate the spherical surface with a small flat spot at the center, so that the tangency is avoided. I have done the first two of these in the attached files, and both transfer successfully.
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