(448z) Insights from Dem Simulation in Comparative Studies of Granular Material and Its Liquid Counterpart
AIChE Annual Meeting
Tuesday, November 15, 2016 - 6:00pm to 8:00pm
DEM (discrete element method) simulation can offer more detailed location, velocity and interaction information for each particle compared with lab experiment, thus enable detailed analysis of the fundamental mechanisms. For liquid-solid systems we have developed and applied the coupled method of CFD (Computational Fluid Dynamics) and DEM simulations for similar purposes. Many experimental setups for studying liquid exist, which provide a rich source of inspiration and quantitative data for comparative studies of granular materials. Two examples are presented in detail. A driven cavity is filled with granular material to create a granular driven cavity, which displays unique behaviors compared with the classic liquid driven cavity under similar conditions. The flow pattern is measured experimentally to calibrate simulation parameters, which is then used to calculate the detailed force distribution of the granular flow field and explain the cause of the difference from the liquid cavity. The second application example is study of a granular jet impinge on a flat, horizontal plate, which has many liquid counterparts as well. We focus on the impinging region between the jet and the plate, as well as the hydraulic jump formed as the granular material spreads over the plate. Different granular and liquid material properties are used to find their effects on the flow pattern and dynamics.