Investigation into improving the efficiency and accuracy of CFD/DEM simulations

- Fluid time steps between 1 and 5 ms were suggested for a compromise between efficiency and accuracy.
- Stiffness coefficients between 104 and 106 N/m offered a compromise between efficiency and accuracy.
- Parallelized CFD/DEM simulation should not exceed the critical number of domain decomposition.
- Using higher parallelized CPU number made gains in computation time for increased solid loading.