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[Jan Stránský <question230139@xxxxxxxxxxxxxxxxxxxxx>]

Question #230139 on Yade changed:
https://answers.launchpad.net/yade/+question/230139

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello Fu,

could you create a minimal working example (i.e. a short script without
unnecessary parts, that reproduces your problem)?

Just an idea: do you have also some standalone (non-clump) particles in the
simulation? if yes, this is the reason (because you prescribe blockedDOFs
only to clumps). If no, the problem is somewhere else :-)
cheers
Jan



2013/8/5 Fu zuoguang <question230139@xxxxxxxxxxxxxxxxxxxxx>

> Question #230139 on Yade changed:
> https://answers.launchpad.net/yade/+question/230139
>
>     Status: Answered => Open
>
> Fu zuoguang is still having a problem:
> Dear Christian Jakob and all users:
>           Long time no see and thanks for helping last time, I can do some
> analysis with 2D clumps now buy at the same time find some problems with
> DOF for those. Following my comprehension, all the centroids of
> spheres(particles)  should be at the same geometric surface during the
> entire time of simulation but this is no in fact.  So my all problems can
> be shown as that:
>
> (1).After the clumps generation finishing, the state is just like that(the
> beginning of my simulation):
> http://i.imgur.com/ZgTCuhW.png
>
> (2).My test simulation is compose of a large number of clumps and 4 fixed
> wall and all clumps should getting a free falling since
> they have contacts with the bottom wall or some other ones  below them. If
> use no function for DOF, the state of my finished tast is of course as
> that(this is 3D simulation):
> http://i.imgur.com/ElBAWMJ.png
>
> (3).After that above, I have another try for employing a function your
> told me last time for DOF , which can be described as:
>
> def DOF(): # of course, DOF condition only for 2D simulation
>
>     for b in O.bodies:
>         if b.isClump:
>            b.state.blockedDOFs = 'zXY'
>
> and  the state of my finished tast this time is of course as that:
> http://i.imgur.com/h0LuITR.png
>
> This can demonstrate obviously that this function does the positive effect
> for DOF. But I also find that all the centroids of spheres are not in the
> same plane by checking the status displayed by YADE just in Y-Z plane. It
> is as that:
> http://i.imgur.com/q11ISgH.png
>
> I think there is nothing wrong in what I just said above. But I am not
> sure the reason of it and it could do harm for my simulation.
>
> Seeking for your help!
>
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