Coupled DEM-CFD Investigation of Granular Transport in a Fluid Channel

International Symposium on Geohazards and Geomechanics 2015

地球科学;生态环境科学

Zhao, T.^1 ; Dai, F.^1 ; Xu, N.W.^1

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, 610065, China^1

关键词: Computational fluid mechanics;    Coupled simulation;    Fluid channels;    granular transport;    Natural environments;    Numerical investigations;    Submarine landslides;    Transport process;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/26/1/012016/pdf
DOI  :  10.1088/1755-1315/26/1/012016

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper presents three dimensional numerical investigations of granular transport in fluids, analysed by the Discrete Element Method (DEM) coupled with Computational Fluid Mechanics (CFD). By employing this model, the relevance of flow velocity and granular depositional morphology has been clarified. The larger the flow velocity is, the further distance the grains can be transported to. In this process, the segregation of solid grains has been clearly identified. This research reveals that coarse grains normally accumulate near the grain source region, while the fine grains can be transported to the flow front. Regardless of the different flow velocities used in these simulations, the intensity of grains segregation remains almost unchanged. The results obtained from the DEM-CFD coupled simulations can reasonably explain the grain transport process occurred in natural environments, such as river scouring, evolution of river/ocean floor, deserts and submarine landslides.