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[Jan Stránský <question220640@xxxxxxxxxxxxxxxxxxxxx>]

Question #220640 on Yade changed:
https://answers.launchpad.net/yade/+question/220640

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

Do I understand correctly, that you already have the simulation, and you
only need to apply boundary conditions? If so, you can do it easily by
prescribing velocity (or positions, but velocity is more recommended) of
certain particles (e.g. facets):

facetsToMove = [facet1,facet2,...,facetN]
for f in facetsToMove:
  f.state.vel = Vector3(0,0,1) # whatever you need

if you needed to change this values during the simulation, you can achieve
this by

O.run(1000,True) # or O.run(1000); O.wait()
for f in facetsToMove:
  f.state.vel = Vector3(0,0,2)
O.run(2000,True)
for f in facetsToMove:
  f.state.vel = Vector3(0,0,3)

HTH
Jan


2013/1/31 daalgi <question220640@xxxxxxxxxxxxxxxxxxxxx>

> New question #220640 on Yade:
> https://answers.launchpad.net/yade/+question/220640
>
>  Hi everybody!
>
> I'm a new Yade user and I need some help to carry out my research.
>
> I'm studying the behaviour of a coarse aggregate layer composed of two
> sub-layers. Both sub-layers have the same properties, granulometry, etc,
> but the upper one is denser than the lower one.
>
> The goal is to figure out how the particles of the two sub-layers mix each
> other as a result of two different load cases:
>
> 1) Vertical load applied during a short time over a certain area (not over
> just a particle) of the upper boundary of the upper sub-layer.
>
> 2) A rod is introduced into the layers and then it moves with a trajectory
> in a horizontal plane.
>
> The problem is that I don't know how to simulate both load cases. Could
> anyone help me out?
>
> Thanks in advance!
>
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