The channel is 30cm long, 6.3cm wide and 2.1cm high. Gravitational acceleration of 9.81 m/s^2 acts towards the bottom. On the left end spherical particles of 1mm diameter are generated with an inflow velocity of 2m/s resulting in 2.4*10^6 new particles per second. The obstacle is 2cm long and wide, extends to the full height of the channel and is placed directly in the middle of the channel at a distance of 3cm to the inflow. The setup was simulated for roughly 5 seconds simulation time resulting in 5*10^5 time steps of constant length 10us. In each time step 10 iterations were performed using an underrelaxation factor of 0.75. The simulation ran for 2:05 hours on 64 nodes of the Emmy cluster at the Rechenzentrum Erlangen (RRZE). To properly resolve the dynamics visual scene descriptions were written to disk with a rate of 600 frames per second. The final video is slowed down by a factor of 20. The error reduction parameter was set to 0.8.
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By : Tobias Preclik