Help~!! undefined cells

zcesd47 · July 12, 2011, 10:38

Dear all friends

I defined a smooth free surface using mesh that matches the initial wave profile，and then remeshed to hex mesh it after a few step. But when I check the volume fraction of XZ plane face, there are many undefined cells and the remeshed mesh was broken. But when I check the mid face, the cell is smooth.. Why this happen!? Is it because geometry problem??

Thanks a lot

Dijun

ghorrocks · July 12, 2011, 18:55

Why are you remeshing? This model should work fine without remeshing.

zcesd47 · July 13, 2011, 09:33

Quote:

Originally Posted by ghorrocks

Why are you remeshing? This model should work fine without remeshing.

Thank you. In order to create a smooth wave profile I use the mesh to match the profile which does not has uniform cell, I thought better results can be obtained by remeshed to the structured mesh, but it seems does not work.

ghorrocks · July 13, 2011, 19:36

I would think you remeshing is going to do more harm than good. You should be able to use a very high quality hex grid on this simulation and free surface models work very well on high quality meshes. Your remeshing is significantly reducing the mesh quality. A step backwards in my view.

zcesd47 · July 14, 2011, 09:08

Quote:

Originally Posted by ghorrocks

I would think you remeshing is going to do more harm than good. You should be able to use a very high quality hex grid on this simulation and free surface models work very well on high quality meshes. Your remeshing is significantly reducing the mesh quality. A step backwards in my view.

Thank you so much for the advices!!

I will do several more trial and if it does not work I ll not use remesh.

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July 12, 2011, 18:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Why are you remeshing? This model should work fine without remeshing.

July 13, 2011, 19:36		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I would think you remeshing is going to do more harm than good. You should be able to use a very high quality hex grid on this simulation and free surface models work very well on high quality meshes. Your remeshing is significantly reducing the mesh quality. A step backwards in my view.