Question #659177 on Yade changed:
https://answers.launchpad.net/yade/+question/659177
Status: Open => Answered
Gary Pekmezi proposed the following answer:
I do not see a material definition/assignment. The "Brownian motion"
effect is likely due to the particles not having any mass.
You can add a material like this:
O.materials.append(FrictMat(young=var1,poisson=var2,frictionAngle=var3,density=var4,label='spheres'))
Then assign it to the particles in the scene with:
sp.toSimulation(material='spheres')
By the way, O.bodies.append(sp) and sp.toSimulation() do the same thing.
You only need one of them.
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