Loic Ivaldi
Ansys Employee
Look at the picture with the mass scaling... you have the line "percentage increase = 5.078e+06" meaning you have increased the mass of your model of ~5 Millions % (i.e you have multiplied the mass x50000).
Without details and taking simplification, your timestep in the simulation with mass scaling should be ~7.8e-10 => Time Step Size * TSSFAC = 8.7e-10 * 0.9
That should give you (I hope) an increase of mass of ~5%.
SPH simulations are time consuming especially for "long" duration physical events.