FLUID-SOLID COUPLING MODEL BASED ON DEM USING OpenFOAM AND preCICE

Abstract

 Althogh micro-plastic (MP) redispersion from coastal area has been pointed out, there is few study to quantify the MP dynamics and its interaction with sand under wave and currents. In this study, as a fundamental investigation for MP dynamics, we have developed CFD-DEM coupling model to understand interaction between solids as well as between solid and fluid. We developed a DEM solver and employed open-source software OpenFOAM for hydrodynamics, then coupled these models using preCICE library. We first introduce DEM formulation and preCICE library together with a coupling test. Next, we applied the present model to particle settling problems and found reasonable agreement with an analytical formula in 1-way coupling while discovering different behavior in 2-way coupling for single particle test cases. Lastly, in the multiple particle test cases, we observed changes in particle behavior due to the use of an empirical formula dependent on the porosity.