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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Calculated Energy not equal to simulated energy › Reply To: Calculated Energy not equal to simulated energy

January 25, 2024 at 2:11 pm
Ram Gopisetti
Ansys Employee

Hi Aaron, 

I am not sure what you are doing here, but consider that the perfect eastic collision between two spherical objects with 4.11025039e-003 kg and 10 m/s should produce 0.205 J of KE. 

If you check the KE trackers, I got the same except with some numerical error, which can be tightened with mesh e.t.c

Since the momentum is not fully transferred because of the time for ball 1, you are seeing peaking, but for ball 2, with the initial velocity applied, you see it started at 0.196 so it is working as it needed to be. Check your setup. 

Cheers, RamÂ