yade-users team mailing list archive

[Jan Stránský <question253296@xxxxxxxxxxxxxxxxxxxxx>]

Question #253296 on Yade changed:
https://answers.launchpad.net/yade/+question/253296

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello Dominik,

thanks for the explanation. On the case of periodic sand pile, imagine that
the cell would be shifted a bit left or right. Only the visualization would
be different (the top of the "hill" would have different position
relatively to the cell), but otherwise there would be no difference from
physics point of view. The reason is the periodicity :-)

The same would be in the case of the ball mill. Because in the direction of
mill axis the simulation is periodic, it does not matter where you put the
periodic cell. It would only influence the postprocessing stage.

If I misunderstood something or did not explain something properly, let me
know :-)

cheers
Jan




2014-08-19 10:51 GMT+02:00 Dominik Boemer <
question253296@xxxxxxxxxxxxxxxxxxxxx>:

> Question #253296 on Yade changed:
> https://answers.launchpad.net/yade/+question/253296
>
>     Status: Answered => Open
>
> Dominik Boemer is still having a problem:
> Hello Jan,
>
> Thanks you! Let's put it simple.  I think that you know the periodic
> sand pile example (https://www.youtube.com/watch?v=xAZuNFliFcw ;
> https://github.com/yade/trunk/blob/master/examples/periodicSandPile.py).
> The box in this example seems to have the following vertices:
>
> (0,0,0),
> (length,0,0)
> (0,width,0)
> (length,width,0)
> (0,0,3.*height)
> (length,0,3.*height)
> (0,width,3.*height)
> (length,width,3.*height)
>
> Thus, the center of gravity of the box is located at
> (length/2,width/2,1.5*height).  I want however that the coordinates of
> the COG are (0,0,0).  In other words, I would like to translate the box
> (or to create one that directly satisfies this condition).
>
> Why?  I am currently creating a DEM simulation of a ball mill.  And
> instead of inserting two walls at the mill ends (to close it), I would
> like to create a periodic boundary such that the balls which are
> evacuated at one side reenter at the other side.
>
> I hope this might help.
> Thanks again,
> Dominik
>
> --
> You received this question notification because you are a member of
> yade-users, which is an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to     : yade-users@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~yade-users
> More help   : https://help.launchpad.net/ListHelp
>

-- 
You received this question notification because you are a member of
yade-users, which is an answer contact for Yade.