Hello LIGGGHTS forum,
I was trying to simulate a spherical particle motion in a flat rotating platform with an initial push given to the ball such that there is no slipping between ball and the rotating platform. Now according the several studies the balls angular velocity should be 2/7 of the rotating platform angular velocity with maintaining a stable circular orbit.
The simulation results were successfully maintaining a stable circular orbit but the ball angular velocity is quite higher than the reported value.
Since I am new to DEM i was wondering how the relative velocities calculations are taking place in the backhand of LIGGGHTS for particles and moving wall cases.
Any help would be appreciated.
Thanks a lot.
I have attached the case script file and mesh file as well.
| Attachment | Size |
|---|---|
 testcase.tar_.gz | 2.4 KB |
SHUBHAM AGARWAL | Sat, 07/17/2021 - 19:59
LIGGGHTS will calculate the absolute
Hello
As far as I know LIGGGHTS solver calculates the absolute velocities, acceleration and displacements due to all forces being applied on a particle. In no-slip case, a friction force/torque will be applied to the particle due to the in interface
If you want to know the relative velocities you have to calculate it separately