Rotatory and translatory mesh motion

[juwoha]

Hi everyone,

I am trying to simulate a gear-like disc with both rotational and translational motion interacting with an agglomerate. The goal is for the geometry to rotate around its center. I have selected the appropriate option in the time-dependent motion setup. However, when I run the simulation, the geometry wobbles around its center.

I am unsure whether the geometry center is recalculated at each time step or only at the first time step. Regardless, it appears that the calculation of the geometry center is causing the wobbling issue.

To investigate, I created a test case using a cylinder geometry, which behaves as expected without any wobbling. However, when I load my gear-like geometry, the wobbling occurs.

Setup Details

• Time-dependent motion:

  • Checked "Rotate around center"
  • Translational velocity (x) = 1 m/s
  • Rotational velocity (z) = 600 rad/s

• Test Cases:

  • Cylinder (radius = 75 mm, height = 8 mm) at position (0, 0, 0)
  • Gear-like geometry (Rotation_Test2.STL) at position (0, 0, 0)

• Simulation Setup:

  • Simulation step: 2.5e-8 s
  • CPU mode
  • Interparticle contact model/Particle wall contact model: Hertz-Mindlin

• Simulation Domain:

  • min_x, min_y, min_z, max_x, max_y, max_z = [-1000, -1000, -1000, 1000, 1000, 1000] (in mm)

• Environment:

  • Tested on Windows 10
  • MUSEN version 1.74.0 installed via open setup installer

I would greatly appreciate it if someone could verify the problem or point out any mistakes in my setup.

Many thanks and greetings.

Geometry example

test_geometry.zip