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New question #290950 on Yade:
https://answers.launchpad.net/yade/+question/290950

I intend to create a cloud of spheres in a box which has:

- periodic boundary conditions for all vertical walls
- and rigid floor & ceiling

I am applying compression from the ceiling. Now, what I observe is that some particles cross the floor and ceiling (which are intended to be rigid) and seem to be in a perpetual motion without any interaction with the system  


The material properties I am using are as follows:

For the floor and ceiling: FrictMat( young=200e9, poisson=0.3, density=8000. ,frictionAngle=radians(30) ,label='wall_mat')

And for the particles:
 FrictMat( young=4e9,poisson=0.25,density=1346,frictionAngle=radians(30),label='sample_mat')

Can I solve this problem by increasing the Young's modulus for both the materials and what values should I use here ?
 Also, wouldn't increasing the Young's Modulus for particles arbitrarily lead to unphysical response ?

 In addition, I am using O.dt=0.5*PWaveTimeStep() in my simulation. Now, increasing the Young's modulus would also reduce the required time step.


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