Page 241 - The Combined Finite-Discrete Element Method

224 SENSITIVITY TO INITIAL CONDITIONS

Figure 6.11 Moving towards the top of the box and bouncing back.

Figure 6.12 Bouncing back.

However, in Figure 6.18 it can be noticed that the left-hand rod is slightly inclined, i.e.
slightly different behaviour between the two rods is noticeable.
Further motion shown in Figure 6.19 results in the left-hand rod further rotating, hitting
the top of the box at an angle, and thus rotating even further.
In Figure 6.20 the left-hand rod is spinning and moving vertically, while the right-hand
rod is still vertical. Further motion results in the left-hand rod being almost horizontal
and vertically in a different place from the right-hand rod. Further motion is such that no
resemblance between the motion of the left-hand and right-hand rod exists.
It can be observed that an almost negligible difference in initial conditions has resulted
in a completely unrelated motion sequence between the two rods. This was a small-
scale, frictionless discrete element simulation. Similar sensitivity to initial conditions is