[nilotpal]

Hi everyone,
I have a case of quartz particles being transported with air in a domain. I am trying to implement a user defined particle-wall interaction through a Particle User Routine. This routine takes in two arguments - Quartz.Particle Impact Angle and Quartz.Velocity on a wall. It returns two things - the perpendicular and parallel coefficient of restitution. The reason I am using a Particle User Routine is because neither a CEL expression nor a general User Fortran can access the particle impact angle, a track variable.
I've attached an image of the settings. To use this routine, I turned on User Wall Interaction (inside the blue oval) and used the Particle User Routine I defined. The problem, however is that I am unable to turn off the default wall interaction (inside the red oval), which is making cfx throw an error in Solution Manager, at the end of the simulation.
Do you have a solution to this?