yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

On 13 April 2011 10:32, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

> Hi there,
>
> The note:
> Let me recall that Dem3Dof is unmaintained and links to many known and
> unfixed bugs (see below).
> If some of you are using this class without problems, good for them
> (still, the fact that Yade doesn't crash doesn't mean that the result is
> correct...).
> But for long terms development, another geometry class should be
> preferred, else the old bugs will re-surface one day or the other.
>
> The question:
> A long standing bug in Yade is the different force sign convention
> between ScGeom and Dem3Dof. If Dem3Dof is unmaintained, there is no
> reason to keep its sign convention as the default. Reverting the default
> will let everybody run simulations using the maintained code without the
> need to add "revertForce=True" in scripts.
> The problem is - in turn - those still using Dem3Dof would have to
> specify "revertForce=False" in their script, so one question is how many
> users would be affected. I can see Jan impacted by such change. I think
> Anton is also using Dem3Dof but not periodic BCs (?), which is the only
> place where revertForce really matters. Is there somebody else using
> Dem3Dof?
>
> Another geometry class is L3Geom, which uses the same sign convention as
> Dem3Dof, but it is (I think) not used currently. It is still possible to
> revert the sign in L3 without much risk, so that there would be no more
> sign conflicts in maintained code (assuming somebody will develop and
> maintain the L3 framework).
> What do you all think?
>
Hi Bruno,

am using ScGeom so speaking for myself (and my Lab mates), that is ok. I
also recall that this convention is in agreement with most of the work
available on contact mechanics problems. I hope everything will work just
fine, I see Anton suggesting a branch to test the change, that is a good
idea. Let us know.

Chiara

>
> Bruno
>
> https://bugs.launchpad.net/yade/+bug/585898 (concluding that Dem3Dof is
> unmaintained and that we stop reporting bugs on it)
> https://bugs.launchpad.net/yade/+bug/585771
> https://bugs.launchpad.net/yade/+bug/399963
> https://bugs.launchpad.net/yade/+bug/675955
>
> --
> _______________
> Bruno Chareyre
> Associate Professor
> ENSE³ - Grenoble INP
> Lab. 3SR
> BP 53 - 38041, Grenoble cedex 9 - France
> Tél : +33 4 56 52 86 21
> Fax : +33 4 76 82 70 43
> ________________
>
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