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[Jeff <question313648@xxxxxxxxxxxxxxxxxxxxx>]

Question #313648 on Yade changed:
https://answers.launchpad.net/yade/+question/313648

    Status: Answered => Open

Jeff is still having a problem:
Hi Jan,
Thank you for your answer.

in fact I initially tried the difference between 2 cylinders you suggest
and I then moved to the revolution surface because I found that the inside
cylinder was fully filled as soon as its diameter  was close to the sphere
diameter.
 I thought that the revolution surface approach I posted will give me an
explicit control of the angular discretization. I found with a few
experiment that it was indeed playing a role on the performance of the
algorithm but I could never come close to the wire I need to model... so my
post.

I assume when you mention other aproach that you are suggesting gravity
filling with sphere factory ?  something else?

Thanks anyway
JF

Jean-François Leon
Galtenco

Tel [Main-Global]: +1 (415) 322-0376
Cell [France]: +33 (651) 168-014

On Mon, Aug 1, 2016 at 9:12 AM, Jan Stránský <
question313648@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Question #313648 on Yade changed:
> https://answers.launchpad.net/yade/+question/313648
>
>     Status: Open => Answered
>
> Jan Stránský proposed the following answer:
> Hi Jeff,
>
> I am new to Yade
>
>
> welcome :-)
>
> You can define the predicate as a difference of two cylinders [1]. If the
> gap between inner wire and inner particles is too big, then you would have
> to use different initial packing method than random dense pack.
>
> ####################
> pred = pack.inCylinder((0,0,0),(0,0,length),rOut) -
> pack.inCylinder((0,0,0),(0,0,length),rIn)
> sp=pack.randomDensePack(pred,radius=rS,returnSpherePack=True)
> sp.toSimulation()
> ####################
>
> cheers
> Jan
>
> [1] https://yade-dem.org/doc/user.html#boolean-operations-on-predicates
>
>
> 2016-08-01 14:13 GMT+02:00 Jeff <question313648@xxxxxxxxxxxxxxxxxxxxx>:
>
> > New question #313648 on Yade:
> > https://answers.launchpad.net/yade/+question/313648
> >
> > Hi All
> >
> > I am new to Yade and this is my first post.
> >
> > I am trying to generate a random dense packing in  a cylinder with  a
> fine
> > wire on its axis:
> > my problem : the wire size being much smaller than the sphere diameter,
> > the spheres overlap it completely and make it "useless as such"
> > Can someone could provide some advice for improving this packing...? ( I
> > would like the sphere against the wire not inside..)
> > Thanks a lot
> >
> > JF
> >
> > the instructions I use are pretty simple ( copied and slightly adapted
> > from some example):
> >
> > ###geometry definition
> > rIn=0.75 # wire radius
> > rOut=13 #cylinder radius
> > length=320 # cylinder length
> > rS=2.6 #sphere radius
> >
> > poly=((rIn,length),(rOut,length),(rOut,0),(rIn,0),(rIn,length))
> > thetas=arange(0,2*pi,pi/24)
> > pts=pack.revolutionSurfaceMeridians([[(pt[0],pt[1]) for pt in poly] for
> > theta in thetas],thetas)
> >
> >
> surf=pack.sweptPolylines2gtsSurface(pts,capStart=True,capEnd=True,threshold=1e-2)
> > ### add surface to the simulation
> > O.bodies.append(pack.gtsSurface2Facets(surf,color=(1,0,0)))
> > #####generate the packing and add it to the simulation
> > sp=SpherePack()
> >
> >
> sp=pack.randomDensePack(pack.inGtsSurface(surf),radius=rS,returnSpherePack=True)
> > sp.toSimulation()
> >
> >
> >
> >
> >
> >
> >
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