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[Jan Stránský <question293600@xxxxxxxxxxxxxxxxxxxxx>]

Question #293600 on Yade changed:
https://answers.launchpad.net/yade/+question/293600

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Felipe,

By the way, I have been asking in this question if it would be possible to
> explain with more details how to use:
> -> Periodic Cell;
> -> Periodic Boundary;


from my point of view, periodic boundary is just the opposite faces of
periodic cell

Both of topics above, what is mean of use these concept on the
simulation?


from reading the table of contents of the book you mentioned, it should be
clear from the book :-)

Will it have to save time on the simulation?


To save simulation time is usual reason of its usage, to simulate just part
of the domain if you know / assume that the rest of the domain behaves
periodically. But it does not "have to save time on the simulation"

What will it be the difference when i am using these concepts or not?


The main difference is that with periodic boundary conditions the
simulation is periodic, and vice versa :-) with all advantages and
disadvantages

You may check this example for instance [1] or try the following simple
script showing interactions of three particles crossing the periodic
boundaries

cheers
Jan

########################################
O.periodic = True
O.cell.setBox(6,10,14)
b1 = sphere((0,0,0),1,color=(1,0,0))
b2 = sphere((2,4,4),1,color=(0,1,0))
b3 = sphere((4,8,8),1,color=(0,1,1))
O.bodies.append((b1,b2,b3))
O.step()
b3.state.vel = 5e-5*Vector3(-1.1,-2,-2.2)
#
from yade import qt
qt.View()
O.run()
########################################

[1] https://www.yade-dem.org/wiki/Miscellaneous_videos


2016-05-12 0:12 GMT+02:00 Felipe <question293600@xxxxxxxxxxxxxxxxxxxxx>:

> New question #293600 on Yade:
> https://answers.launchpad.net/yade/+question/293600
>
> Hello Everybody,
>
> I would like to know how i can get more information about periodic cell
> and also periodic boundary.
>
> I have studied about this topic with the help of Sullivan - Particulate
> Discrete Element Modelling  book and others paper wich focus on interaction
> between the spheres.
>
> Moreover, I was seeing on DEM Background (YADE) if i would get more
> information but I did not understand how i can use this concept on the
> simulations.
>
> By the way, I have been asking in this question if it would be possible to
> explain with more details how to use:
>
> -> Periodic Cell;
>
> -> Periodic Boundary;
>
> Both of topics above, what is mean of use these concept on the simulation?
> Will it have to save time on the simulation? What will it be the difference
> when i am using these concepts or not?
>
> Thank you for attention.
>
> Please, let me know if you have more information about it and also links
> to learn more about periodic cell.
>
> Best Regards,
>
> Felipe
>
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