Hi Jean-François, as a reference for other users who might have the same problem, could you please write how did yo solve it or what was misinterpreted? Thanks Jan
2016-08-04 12:27 GMT+02:00 Jeff <question313...@answers.launchpad.net>: > Question #313648 on Yade changed: > https://answers.launchpad.net/yade/+question/313648 > > Status: Answered => Open > > Jeff is still having a problem: > Hi Jan > Sorry for the late answer but I was away from my desk > > I explored my problem a bit further and I am happy to report that there is > no trace of bug iassociated to my problem > just a poor use of the code by a beginner > All is just working fine now ! > > thanks for your patience and willingness to answer though even if the > question was naive > > JF > > > Jean-François Leon > Galtenco > > Tel [Main-Global]: +1 (415) 322-0376 > Cell [France]: +33 (651) 168-014 > > On Mon, Aug 1, 2016 at 6:17 PM, Jan Stránský < > question313...@answers.launchpad.net> wrote: > > > Your question #313648 on Yade changed: > > https://answers.launchpad.net/yade/+question/313648 > > > > Status: Open => Answered > > > > Jan Stránský proposed the following answer: > > Hi Jean-François, > > > > 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 am not sure if I got it, could you please send a cript reproducing this > > problem? There might be some bug in the code.. > > > > 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. > > > > > > The problem with inGtsSurface is that it evaluates the sphere > in/ousideness > > only approximately in 6 axis aligned directions [1]. It should not be > > difficult to make it more exact. > > > > I assume when you mention other aproach that you are suggesting gravity > > filling > > > with sphere factory ? something else? > > > > > > gravity deposition is one option, some kind of compression within desired > > volume is another similar option. > > > > Random dense pack first create a packing an then it is "cropped" to the > > geometry, so near boundary the packing is not optimal. You can also use > > randomDensePack(...,cropLayers=3), from certain point of view it improves > > the results [2,3]. Using this parameter and difference of two cylinders, > I > > got (from my point of view :-) OK results. > > > > cheers > > Jan > > > > [1] > > > > > https://yade-dem.org/doc/yade.pack.html#yade._packPredicates.inGtsSurface.__init__ > > [2] https://answers.launchpad.net/yade/+question/291326 > > [3] https://yade-dem.org/doc/yade.pack.html#yade.pack.randomDensePack > > > > > > 2016-08-01 23:42 GMT+02:00 Jeff <question313...@answers.launchpad.net>: > > > > > 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 < > > > question313...@answers.launchpad.net> 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 < > question313...@answers.launchpad.net > > >: > > > > > > > > > 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() > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > You received this question notification because your team > yade-users > > is > > > > > an answer contact for Yade. > > > > > > > > > > _______________________________________________ > > > > > Mailing list: https://launchpad.net/~yade-users > > > > > Post to : yade-users@lists.launchpad.net > > > > > Unsubscribe : https://launchpad.net/~yade-users > > > > > More help : https://help.launchpad.net/ListHelp > > > > > > > > > > > > > -- > > > > You received this question notification because your team yade-users > is > > > > an answer contact for Yade. > > > > > > > > _______________________________________________ > > > > Mailing list: https://launchpad.net/~yade-users > > > > Post to : yade-users@lists.launchpad.net > > > > Unsubscribe : https://launchpad.net/~yade-users > > > > More help : https://help.launchpad.net/ListHelp > > > > > > > > > > -- > > > You received this question notification because your team yade-users is > > > an answer contact for Yade. > > > > > > _______________________________________________ > > > Mailing list: https://launchpad.net/~yade-users > > > Post to : yade-users@lists.launchpad.net > > > Unsubscribe : https://launchpad.net/~yade-users > > > More help : https://help.launchpad.net/ListHelp > > > > > > > -- > > If this answers your question, please go to the following page to let us > > know that it is solved: > > https://answers.launchpad.net/yade/+question/313648/+confirm?answer_id=2 > > > > If you still need help, you can reply to this email or go to the > > following page to enter your feedback: > > https://answers.launchpad.net/yade/+question/313648 > > > > You received this question notification because you asked the question. > > > > -- > You received this question notification because your team yade-users is > an answer contact for Yade. > > _______________________________________________ > Mailing list: https://launchpad.net/~yade-users > Post to : yade-users@lists.launchpad.net > Unsubscribe : https://launchpad.net/~yade-users > More help : https://help.launchpad.net/ListHelp >
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