How to report the particle trajectory to a file
 

I am using discrete phase modeling to simulate the particle trajectory. I have a question regarding how to save the particle trajectory to a file. Since I use the surface injection, that means around 200 particles will be injected from the inlet surface.In the DPM the Maximum number of steps was set as 50000. Then I used udfs to write trajectory report of a plane to a file. It turns out there are only 19 particles in the file. Where are the other particles' varible? How can I write all the particles in the plane to a file? If anybody has a idea, please let me know. Thank you very much!

good luck,

Devy