CFD-DEM simulation of the hole cleaning process in a deviated well drilling： The effects of particle shape

作     者：Siamak Akhshik Mehdi Behzad Majid Rajabi 

作者机构：Department of Mechanical Engineering Sharif University of Technology Azadi Avenue Tehran Iran School of Mechanical Engineering lran University of Science and Technology Narmak Tehran Iran 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2016年第14卷第2期

页      面：72-82页

核心收录：

学科分类：080704[工学-流体机械及工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

主　　题：CFD DEM method Deviated well drilling Particles transport Two way coupling scheme Particle fluid Interaction 

摘      要：We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics （CFD） with the discrete element method （DEM）. This numerical method allows us to incorporate the fluid-particle interactions （drag force, contact force, Saffman lift force, Magnus lift force, buoyancy force） using momentum exchange and the non-Newtonian behavior of the fluid. The interactions of particle-particle, particle-wall, and particle-drill pipe are taken into account with the Hertz-Mindlin model. We compare the transport of spheres with non-spherical particles （non-smooth sphere, disc, and cubic） constructed via the multi- sphere method for a range of fluid inlet velocities and drill pipe inclination angles. The simulations are carried out for laboratory-scale drilling configurations. Our results demonstrate good agreement with published experimental data. We evaluate the fluid-particle flow patterns, the particle velocities, and the particle concentration profiles. The results reveal that particle sphericity plays a major role in the fluid-solid interaction. The traditional assumption of an ideal spherical particle may cause inaccurate results.