DEM Particles protruding through walls
 

Hello all,

I am currently trying to model a randomly packed bed geometry, and am using Star's DEM tools to generate the particles. Everything works just fine until I need to create geometry parts for each sphere. Seen in the picture below, spheres are protruding through my wall surface (even before transforming them into geometry parts), and this is causing me to be unable to mesh correctly later on down the line.

[IMG] https://imgur.com/a/EZLj3LB [/IMG]

I've gone through the tutorials, plus followed some other videos online, and have yet to find an answer to this problem. My mesh size for the surface is larger than my sphere size, so there shouldn't be a problem between the sphere/wall interaction.

Thanks!

This is just a guess but your timestep might be too big. This sounds like the particles will check their vicinity for (possible) collisions (wall or each other) when a timestep is calculated but not in between. This would mean that particles are free to pass through walls while they travel a long time between timesteps.