I ran into an issue with a simulation where a bottle was supposed to fall over. I put the bottle on an edge with its COG not above the edge. I applied gravity to the bottle, so I was expecting gravity to cause the bottle to tip over and fall of the edge. Instead, the bottle remained perfectly upright and did not move.
Some additional information about the simulation:
- I used aluminium for the bottle and the edge
- The edge surface is completely fixed
- I applied a sliding contact between the bottles and the edge (TYPE7)
- Both the bottle and the edge are meshed using a shell mesh
Eventually I tried using a RBODY. The results of this test can be seen below. All nodes in the blue bottle are connected by a RBODY. This did have the desired effect. However, the blue bottle can now no longer deform. For the purpose of this simulation this is not an issue, but I was wondering if there is a way to have the bottle fall over without using a RBODY. Also, I would be interested in an explanation as to why the bottle without the RBODY refuses to rotate.


Figure - bottles at t = 0.0 s (LEFT), bottles at t = 0.2 s (RIGHT)