Flexible discretization technique for DEM-CFD simulations including thin walls

摘要: Abstract The discrete element method (DEM) coupled with computational fluid dynamics (CFD) is regarded as a standard approach for simulation of gas-solid mixture system. In the DEM-CFD method, local volume average technique employed, and hence motion calculated based on void fraction. Although accuracy has been improved through lots studies, inflexibility may become problem due to technique. Specifically, calculations flow involving thin walls substantially impossible even by method. This because wall cannot be represented when its thickness becomes large one grid size usage order solve this problem, flexible discretization newly proposed, where signed distance function immersed boundary are introduced into dual model. technique, two kinds grids used calculate fraction flow. Thus, makes it possible simulate wall. Verification validation tests performed show adequacy Through study, proposed illustrated reproduce exact solution experimental results in Consequently, shown yield reasonable flows walls.