yade-dev team mailing list archive

[Anton Gladky <850864@xxxxxxxxxxxxxxxxxx>]

Dear developers,

I was trying to fix the bug, but I have got a problem, which I cannot solve for the moment.
As you know, problem appears, when the sphere touches (penetrates) on the edge of 2 or
more facets and gets from all of them the forces. Which is not quite correct.

I was trying to implement the following fix. Facets are united in "chains". The chain consists of
the facets, which are in the common case building a "surface". So the sphere can interact at the same
time only with 1 facet of the chain. All other interactions of the sphere with other elements of the
same chain are switching off.

The fix is working relatively good for quasi-static tasks. But when a sphere rolls over
the surface, it "falls" down after the first facet. Because on the edge it should take an additional
force from the "next" facet, which is not happens. That is what we tried to avoid.

I hope you understood, what I mean. If not, let me know, I will try to explain by other words.
It would be interesting to check other DEM-codes, how this problem is solved there (if it is solved).
Also comments and suggestions are welcome.

Thank you.

Anton

-- 
You received this bug notification because you are a member of Yade
developers, which is subscribed to Yade.
https://bugs.launchpad.net/bugs/850864

Title:
  strange facet-sphere behaviour

Status in Yet Another Dynamic Engine:
  Confirmed

Bug description:
  See https://answers.launchpad.net/yade/+question/171223

  Spheres that are exactly on an edge between facets behave strangely.
  Maybe related to other (closed, but never solved) bugs in sphere-
  facet.

To manage notifications about this bug go to:
https://bugs.launchpad.net/yade/+bug/850864/+subscriptions