Example 2, DEFINE DPM BC, fludf
 

I need to article for investigate Example 2
(This example shows how to use DEFINE DPM BC for a wall impingement model.)

Plz guide me

This example has brief comments for each section of code, is there anything in particular you don't understand? I've made a comment in the past on how a similar code calculates the trajectory of a reflected particle which you may find useful.