Task: Create a particulate field using DOPs. In

So I have this file from Jeff's Master class and I'm trying to use this gas concept he's doing, where the tubes are affected by the intial_vel node. My instructions are to “make it like maya” in that there's the box that the tubes are encased in and would bounce off the surface. Also I have a sphere that I'm trying to push through this field and affect the tube motion as well.

So i bust out this file but I have no idea how to make the rbds affect the tubes. I've even tried editing the intial_vel node but it doesnt have a clear input. I'm fairly befuddled but not defeated! Helped is greatly appreciated!