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[xxxea <question693640@xxxxxxxxxxxxxxxxxxxxx>]

Question #693640 on Yade changed:
https://answers.launchpad.net/yade/+question/693640

xxxea proposed the following answer:
> Isn't fixing the pfacets, such that they do not fall, a better
approach? ! how to fix them!! i tried but found nothing... > Then please
open a new question for the problem (this thread should reamain wall-
specific, related to the original question) i will. thanks!!!
zhanghanying 邮箱：zhanghanying@xxxxxxxxxxx 签名由 网易邮箱大师 定制 On 10/27/2020
16:20, Jan Stránský wrote: Your question #693640 on Yade changed:
https://answers.launchpad.net/yade/+question/693640    Status: Open =>
Answered Jan Stránský proposed the following answer: > ### >
O.materials.append(FrictMat(young=4.0e6,... > ... >
O.materials.append(FrictMat(young=1.0e12,... > ### the interaction
stiffness is given by harmonic mean E=2/(1/E1+1/E2), i.e. it is
"determined" by the lower stiffness. In the case E2=inf,
E=2/(1/E1+1/inf)=2E1. This is the case, the overall stiffness is
basically the same as in your air-wall example. >
NewtonIntegrator(damping=0.01,gravity=[0,0,-1e2]), > in wall.py i posted
above the sphere falls then settles down quickly. what does "quickly"
mean? In my case, the sphere bounces "many times" before settling.
Settling is the effect of numerical damping. Setting damping=0, it
bounces "forever". Law2_ScGeom_FrictPhys_CundallStrack, theoretically,
should have no "settling" effect (for damping=0 of course). For better
control of coefficient of restitution, you have to use a more advanced
constitutive law. > what i want to simulate is a 2D rectangular made of
pfacets Then please open a new question for the problem (this thread
should reamain wall-specific, related to the original question) > the
problem is that the pfacets fall down too...which is not what i want. so
i guess a wall under pfacet would help Isn't fixing the pfacets, such
that they do not fall, a better approach? cheers Jan -- If this answers
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