DEME bed compression

[Mohammad Wasfi]

Hello Ruochun, 

This is a DEME-related question.

I am trying to compress a cylindrical bed of particles similar to what is done in the cone penetration demo. However, for some reason, the plane that is used to compress the bed does not seem to be moving or to be interacting with the bed material. I have tried many things but nothing seems to be working. I have attached my code for your reference. 

Thank you so much in advance, 

[Ruochun Zhang]

Hi Mohammad,

This is because when you initially created the plane that is associated with the compressor, it has an initial Z coordinate of 0.5. This is a relative position that never changes, meaning by default the compressor exists as a conceptual object located at (0,0,0), and its geometry (a plane) has a relative coordinate (0,0,0.5) to it. Then when you move the compressor to the Z coordinate of particle_max_z, the plane is still 0.5 above the particle bed.

So you should just instead add that plane with an initial position vector of (0,0,0), not (0,0,0.5).

Also I'd like to add that a coefficient of rolling resistance of 1.0 seems to be too large to be physical. You should make sure it is intended.

Thank you,

Ruochun

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Ruochun Zhang
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Email: ruochu...@alumni.rice.edu
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