Remeshing and Minimum Orthogonality Angle

ashtonJ · May 2, 2014, 08:01

Dear all,
I kept getting negative element volume error in modelling an artery with moving wall. Therefore, I used remeshing method to get rid of the negative volumes.
Minimum orthogonality of my initial mesh was 6.6, so I defined the minimum orthogonality angle<6 [deg] as the interrupt control. As the orthogonality drops below the 6 [deg], the remeshing starts, but surprisingly the minimum orthogonality angle keeps decreasing (please see the attached graph for minimum orthogonality angle) and finally the solver gives negative element volume error.

I think after the remeshing the minimum orthogonality angle should increase as a new mesh is created, but in my case it keeps decreasing even after remeshing.

Could any body explain why this is happening.
Thanks
AshtonJ

KeganLeckness · May 7, 2015, 20:00

Hi, Ashton

I know this is a year removed, but did you have any luck in solving this problem. I am encountering the same myself

Kegan

ashtonJ · May 7, 2015, 20:11

Hi Kegan,
I got rid of the error by improving the mesh quality, in particular the mesh orthogonality. The minimum mesh orthogonality in my models is always greater than 0.3.

Hope this helps.

May 2, 2014, 08:01	Remeshing and Minimum Orthogonality Angle	#1
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 17	Dear all, I kept getting negative element volume error in modelling an artery with moving wall. Therefore, I used remeshing method to get rid of the negative volumes. Minimum orthogonality of my initial mesh was 6.6, so I defined the minimum orthogonality angle<6 [deg] as the interrupt control. As the orthogonality drops below the 6 [deg], the remeshing starts, but surprisingly the minimum orthogonality angle keeps decreasing (please see the attached graph for minimum orthogonality angle) and finally the solver gives negative element volume error. I think after the remeshing the minimum orthogonality angle should increase as a new mesh is created, but in my case it keeps decreasing even after remeshing. Could any body explain why this is happening. Thanks AshtonJ

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May 7, 2015, 20:00		#2
KeganLeckness Member Kegan Leckness Join Date: Mar 2015 Posts: 38 Rep Power: 11	Hi, Ashton I know this is a year removed, but did you have any luck in solving this problem. I am encountering the same myself Kegan

May 7, 2015, 20:11		#3
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 17	Hi Kegan, I got rid of the error by improving the mesh quality, in particular the mesh orthogonality. The minimum mesh orthogonality in my models is always greater than 0.3. Hope this helps.