I want to perform a simulation similar to this in Mfix Dem.
For the sliding valve, it should be move after the hopper is filled with packed particles.
If I input some X-velocity at the valve, it starts moving instantly. Whereas, it should move after the particles are packed say at time (t+deltaT).
How should I input the velocity of the internal moveable surface at time (t+deltaT)?
Also I am a beginner in using UDF. Please explain step by step or if there is any tutorial do suggest.