Thank you sir ,
Very nicely explained. If some particles released from a nozzle at some velocity and particles travels (small distance) to strike on a plate at different strike angles then which velocity is suitable for this case. I am using T=0 Velocity format (case 1) , What is your recommendation.
I have one more question to you that how to calculate the mass of a plate if there is some erosion (some element loss) . I am using "massall" expression but result is not satisfactory because mass shown in geometry and mass calculated through massall expression are not matched even there is no element loss or erosion.