(448ae) Multi-Scale Approach to Developing Non-Spherical Particle Models for Realistic Granular Flow Simulations
Granular kinetic theory terms that are important for two-fluid simulations include: solid stress, collisional dissipation rate, and granular conductivity. The former two terms are dominant for dense granular flows. DEM simulations with the glued-sphere particle model and true cylinder model have been utilized to develop the solid stress and collisional dissipation rate models for elongated, rod-like particles. The developed models are implemented into a two-fluid model code for the simulations of rod-like particle flows. A validation study is presented that utilizes an experiment with monodisperse beds of cylindrical particles. The experiment involves the impingement of an air jet onto a particle bed, which produces a crater. Varying flow rates and particle sizes with aspect ratios from 2 to 8 have been used. The depth of the crater over time is measured for each case. The air jet-induced particle bed cratering is simulated using the two-fluid code and the comparison of the experimental and simulated data is presented.