yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

Second thoughts:
Now I understand [1] a bit more but actually it solves a problem created
ex-nihilo.
There should not be any O.step() between appending bodies and setting
unp=un, since obviously there is no reason to time-integrate before the
initial conditions are completely defined.
In this example time integration is used as a trick to detect interactions
if I understand correctly. The trick is not needed, but I understand the
idea. If you really want to do that you can just step with O.dt=0. I would
not recommend it though, since it is less flexible than defining initial
state completely in python script.
Bruno

[1] https://answers.launchpad.net/yade/+question/266828
<https://answers.launchpad.net/yade/+question/266828>, #4 especially

On 29 July 2015 at 03:51, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>
wrote:

> Hi Jérôme,
> I don't see what you mean, sorry.
> Setting unp=un is explicitely making current state the equilibrium state,
> without the need of any additional "trick", else please explain why you
> think it is not enough.
> Handling modified normals (second specific feature) is the job of Ig2
> functor, not Law functor.
> So overall I think the law you mention is really redundant.
>
> Let me know what you think about this. We should reach consensus about
> such things, else users are all confused by different replies.
> Thanks
>
> Bruno
>
>
> On 28 July 2015 at 21:36, Jérôme Duriez <
> question269724@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Question #269724 on Yade changed:
>> https://answers.launchpad.net/yade/+question/269724
>>
>> Jérôme Duriez posted a new comment:
>> Yes Bruno, I know this "trick" too, which may require one or two more
>> lines than the one you quote (see
>> https://answers.launchpad.net/yade/+question/266828, #4 especially).
>>
>> Yade suffers probably from having too many laws, but as for
>> Law2_ScGeom_JCFpmPhys_JointedCohesiveFrictionalPM, I do not think this
>> not so interesting discussion may conclude it is not justified, since I
>> mentioned earlier a second specific feature about the discontinuity
>> contacts.....
>>
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