Question #269063 on Yade changed: https://answers.launchpad.net/yade/+question/269063
Bruno Chareyre proposed the following answer: >the mesh constructed in Ansys is also not very fine The real question is the number of nodes/gauss points in each element times the number of elements, not the number of elements alone. Looking at you stress field, I guess they are high order elements (i.e. many DOFs per element). >About regularity: should i use random packing instead of regular array or what? Yes certainly if you want to simulate an isotropic material. The problem if you do that is that per-body stress tensors will become highly heterogeneous (while it is ok to use it in the regular packing you have now), then you will need spatial averaging of some sort and sufficiently high discretization level for those local averages to be doable in small regions (compared to problem size). >And the main question is still the same: How to get something similar to Ansys results with Yade? To me it is still not very clear what/why you think is wrong after a quick overview of all above messages. Basically, the solution (displacement and forces - converted into strain/stress if you like) for such regular array can be derived with paper and pen, so I would suggest to divide in two sub-problems: P1- Does the analytical match ANSYS (certainly not since a sphere array is not isotropic)? P2- Does DEM match the analytical expressions? If not there can be a mistake in the definition of boundary condition, a non-static state, or something like that. For the moment it is not clear if you struggle with P1, P2, or both of them. It makes the problem solving difficult. I understand you'd like a step by step answer on how to do things but there is no well posed problem yet in my opinion. After reading the last messages I recognize I'm still a few steps behind Jan, so you can waste my reply maybe. :) @Jan Ok for diagonal interactions, I didn't notice. It is indeed more isotropic, but on another hand isn't it what explains the special trend of stress on free boundaries? This boundary effect is still a problem in my eyes (half stress where force is applied is ok, it is a post processing artifact). Bruno -- You received this question notification because you are a member of yade-users, which 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
