Bug in contact handling

richti83's picture
Submitted by richti83 on Wed, 01/13/2016 - 09:37

I'm trying to simulate a sieving stack. The Particles are 6% larger than the holes.
I reduced the problem to one single hole and one particle.
When the particle is exactly centered to tho hole everything works as expected. But if it is a little bit excentric the particles jumps arround unexpectedly.
See attached script and images for details.
I think something is wrong in handling edge contacts.
I tried different youngsmodulus and timesteps allready.

thanks for having a look,
Christian.

AttachmentSize
Plain text icon Animation of problem51.17 KB
Plain text icon Input deck2.12 KB
Plain text icon simple geometry1.33 KB
Image icon there should not be a contact at the corner67.16 KB

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ckloss's picture

ckloss | Mon, 01/25/2016 - 22:32

Hi Christian,

thanks for the note! I'll try to have a look before the next release!

Christoph

ckloss's picture

ckloss | Wed, 05/11/2016 - 21:32

Hi Christian,

thanks for posting this test case! There will be an update for the algorithm in the next release (there was a typo in one of the statistically very rare cases of the algorithm)

Best wishes
Christoph