Question #292846 on Yade changed: https://answers.launchpad.net/yade/+question/292846
Status: Open => Answered Jan Stránský proposed the following answer: Hi Varun, > VG is still having a problem: > Thinking about this problem more, this might not actually be a bug. As you > outlined, the difference between the previous version and "fixed" version > is: > - Previous version: Pack all the smaller spheres within the predicate > (bigger sphere), such that the centers of smaller spheres are within the > boundary of predicate. > - Fixed version: Only the smaller spheres which are entirely contained > within the predicate are considered. > > What the fixed version does can also possibly be attained by > pack.inSphere((s[0][0],s[0][1],s[0][2]),(s[1]-particle_radius)). > Correct me if I am wrong. The description of previous and fixed versions is correct in pack.inSphere, it was a real bug. Of course, you can play with settings like using s[1] or s[1]-particle_radius, but this is different point. > > That still doesn't solve the physical problem I am trying to set up. I > should give a better description of the problem I am trying to solve, if > there is a better set up possible for the problem: > > -- I have a granular sample with given input particle size distribution. > Under mechanical loading, these particles will break and I want to get > the resulting particle size distribution. > > -- I am representing the input particle size distribution with spherical > particles of diameters D1, D2, D3 etc. All of such big particles are > composed of smaller particles of diameter 'd', since d is the smallest > particle size of interest. > > -- Initially, within each big spherical particle, all the smaller > particles should be densely packed and connected with cohesive bonds. As > the loading is applied, the initially defined cohesive bonds within each > big sphere will break progressively leading to smaller fragments, giving > a new particle size distribution. > thanks for clarifying, but your description was OK before :-) how you want to create the initial packing is the matter of your preferences. randomDensePack within a big agregate is a good choice. For the big aggregates, you can use: - makeCloud like now - randomDensePack to get denser packing of bigger aggrgates - use something like randomDensePack on already "meshed" aggregates, see Klaus's answer #3 in [1] > > > The major problems I am facing in the current script are: > > -- Smaller particles from two different predicates (big spheres) tend to > overlap. > this should not happen with newer version > > -- I am noticing that sometimes cohesive bond gets formed between two > smaller particles of different predicates. I would like to avoid this, > since I only want non-cohesive contact between the two different big > spheres. > > -- Initially, within a single big sphere itself, sometimes there are > particles which are shown not to have any cohesive interaction, leaving > that small single particle free to fly. > this is material model dependent. I am not very familiar with CohFrictMat, so somebody else have to help. Probably open a new question on this topic, since it is different from the original problem. cheers Jan [1] https://answers.launchpad.net/yade/+question/292672 -- 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