Question regarding particle generation for calibration of different particle types (Dynamic AoR)

kihoon_hong

I am currently working on a particle mixing simulation and need to calibrate the particle contact parameters. I plan to use the dynamic Angle of Repose (AoR) method using a rotating drum.

For parameters involving the same particle type (self-interaction), I assume I can simply generate a single type of particle using a Factory for the measurement.

However, I have a question regarding how to generate particles when simulating interactions between different particle types:

• Should I pre-mix the particles using a mixer in a separate simulation and then import them?
• If so, is there a specific method to import the pre-mixed particles (from a previous simulation) as an initial condition?
• Or is there an alternative or better method to achieve this?

Any advice would be appreciated. Thank you.

Stephen Cole

Hi,

It's common practice if you have two materials to calibrate each material separately, and then for the interaction set the parameters to be the mid-point of these.

For example if material1:mateiral1 static friction is 0.5 and material2:material2 static friction is 0.8 you can set the material1:material2 static friction to 0.65.

This is case dependent however but often used.

For introducing the material I'd typically use the 'rainfall' method. You can create a virtual geometry above the area you want to fill, and then assign two factories to this geometry. Each factory generating a different material with a velocity so the material falls into the required area. So long as the factories are set to random (which is default) the material mix will be randomly generated and fall into the mixer geometry. You should make sure the factory area is sufficiently large to allow the material to be easily generated without any segregation.

Regards

Stephen