Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

Base studies on the modeling of liquid-solid flows using an SPH-DEM combined model were conducted in microscale and macroscale views. In the microscale model, flows around a cylindrical solid particle were simulated at three different values of Reynolds numbers, Re=1, 10, and 1000 using SPH. Drag forces acting on the cylinder were determined using the velocity distribution of neighboring fluid particles on the surface of the cylinder. The drag coefficient from the simulation showed good agreement with that obtained from experimental data under the condition of Re=1. As the Reynolds number of the flow increased, error in the drag coefficient increased accordingly, because the boundary layer thickness became much smaller than the space between fluid particles and the cylinder. In the macroscale model, the process of size separation of 100 solid particles was simulated in an elutriation separator using an SPH-DEM combined model. The motions of fluids and solid particles were solved by DEM and SPH algorithms. The size-based separation of solid particles can be observed clearly from the results. Different flow properties, and also the different movements of solids in various regions in theelutriator, showed good agreement with the corresponding physical phenomena.