Problem with Particle insertion

Hari,

The problem is that you defined the insertion region too large. When using insert_stream, you can specify either the extrusion length of the region or the 'insert_every', which tells it how often to insert particles. Depending on which one you specify, LIGGGHTS will calculate the other one. So, with your specified extrusion length for the insertion region, LIGGGHTS calculated that it could get all the particles in in one shot, and did so. If you reduce the extrusion length sufficiently, you'll find that it will start parsing the particles over multiple insertions. If you have a specific frequency in mind, you're better off using the insert_every statement.

Couple of other observations on your input deck:
* Your modulus is very high, which is necessitating the very small timestep. Do you really need it that high? You can often safely reduce it by many orders of magnitude from 'realistic' values for the sake of computational efficiency.
* Your input deck needs to be updated to run w/ LIGGGHTS 3.x.
* Make sure you unfix the timestep check after running it once or it will continue to run every time step and cost you from a computational standpoint.

Regards,
Chris

there is a rule of thumb for insertion capability:
Im=0.2*A*v
20% if theoritical volume flow because you can not insert a denser package. So you need to increase v or the mesh area or every to insert less particles per insertion step.

Hi,

you can insert at 20% volume fraction and then grow the packing to densify it. There is even a tutorial that shows how to do it

Christoph