Chris Quan
Ansys Employee

Adding Gravity Acceleration keeps adding external work to the system. Thus the total energy is not conserved w.r.t the Reference Energy (initial energy at the Cycle 0). It is expected to see Energy Error if it exceeds 10%.

Setting Energy Reference Cycle under Analysis Settings to a very big number such as 1E7 could prevent the solver interruption by Energy Error.

All objects in the dropped part should have the same initial conditions. Otherwise, the part will break apart before drop impact occurs.