– If you find that your simulation is not physically correct, you can try to use higher values for Subframes, expecially when big velocities are involved.

– Higher value of Subframes means smaller value for the delta time used in the ODE solver, that is to say more accuracy in calculating every step.

– In this example you can see how Subframes was used to obtain a more realistic simulation (particles with high velocity in a box).

Blender Particles Integration Subframes