yade-dev team mailing list archive

[Janek Kozicki <janek_listy@xxxxx>]

If I recall this derivation I will let you know ASAP. I only remember
that it was quite convincing... But maybe Bruno you can ask Frederic
(is he in France now?)


Janek Kozicki said:     (by the date of Tue, 13 Dec 2011 14:19:04 +0100)

> Frederic introduced this double radius.
> 
> And it has a reasoning and derivation from formulas. Problem is that
> I can't remember now this derivation. But When I reproduced his
> derivation it actually made sense to use double radius for flat
> surfaces. Maybe Frederic remembers and we can ask him.
> 
> I can only recall that it has something to do with
> - penetration depth
> - point of contact
> - stiffness
> 
> and from this derivation a sphere in contact with "mirror" double
> radius sphere behaved exactly the same as if it was in contact with
> flat surface. Maybe that also had something to do with shearing, but
> I'm not sure now). A critical point in this derivation was that the
> double radius spheres was moving & following (=="mirror") the real
> sphere that was in contact with flat surface.
> 
> I can't recall this now.
> 
> best regards
> Janek Kozicki
> 
> Klaus Thoeni said:     (by the date of Tue, 13 Dec 2011 23:00:24 +1100)
> 
> > Well if it is 1 for boxes now I don't see any reason why it should be 2 for 
> > facets. Or is there a reason? Any other opinions? 
> > 
> > On Tue, 13 Dec 2011 10:46:31 PM Bruno Chareyre wrote:
> > > > thanks for the active discussion. So I guess we just leave it as it is
> > > > and use 2 for boxes and facets if this is the usual assumption.
> > > 
> > > It is 1 for boxes now (and good like this). I didn't know 2 was "usual".
> > > I would make it 1 for facet as well, but since I'm not using facets a
> > > lot, I can't decide for others.
> > > 
> > > Bruno
> > > 
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> 
> -- 
> Janek Kozicki                               http://janek.kozicki.pl/  |
> 
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-- 
Janek Kozicki                               http://janek.kozicki.pl/  |