Dear Simulation community ,

I am trying to simulate the  pressure generated on two plates due to water flow between them using SPH method using particle generator. the gap between the plates is 65micrometers, the plate length is around 2mm.both plates are modelled as rigids and the plate mesh size is around 20micrometers.i have applied constant flow rate using an amplitude definition . I have also applied gravity for the particle regions.

I have below questions about the analysis. 

1. even though the particle velocity is set constant , i could see the particle velocity increase during the course of analysis.
2. I could some of the particles penetrating through the plates. is there any way to improve the contact behaviour to prevent penetration. 
3. the cpress output shows the pressure is generated at the plates only at the initial impact point.after that ,even though the particles flows through the length of plate the pressure induces is almost 0. any suggestion to improve this behaviour

Regards

Vimal