EFFICIENT COEFFICIENT OF RESTITUTION AND LATTICE-BOLTZMANN SIMULATION OF GRAVITATIONAL SETTLING AND REBOUND IN A VISCOUS FLUID

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	EFFICIENT COEFFICIENT OF RESTITUTION AND LATTICE-BOLTZMANN SIMULATION OF GRAVITATIONAL SETTLING AND REBOUND IN A VISCOUS FLUID
	Jin GD(晋国栋); He GW(何国威); Zhang J(张健)
会议录名称	ICTAM 2012 Proceedings
	2012-08
会议名称	第23届国际理论与应用力学大会 (The 23rd International Congress of Theoretical and Applied Mechanics, ICTAM2012)
会议日期	2012年8月20
会议地点	Beijing
摘要	Two fundamental problems in wall-bounded particle-laden flows are explored: how to correct the unresolved hydrodynamic force using the lubrication approximation when a finite grid size is used in the simulation and the particle is very close to the wall, and how to model the effective coefficient of restitution to account for the viscous dissipation of the fluid when a finite time step is used in the simulation. A new model for lubrication correction is proposed to account for the variation of the particle velocity during the impact. Based on the lubrication approximation, a semi-empirical model for the effective coefficient of restitution is proposed and integrated into the simulation. The numerical results obtained are in good agreement with the experimental results. Our method, therefore, provides a basis for investigating more complex wall-bounded particle-laden flows.; Two fundamental problems in wall-bounded particle-laden flows are explored: how to correct the unresolved hydrodynamic force using the lubrication approximation when a finite grid size is used in the simulation and the particle is very close to the wall, and how to model the effective coefficient of restitution to account for the viscous dissipation of the fluid when a finite time step is used in the simulation. A new model for lubrication correction is proposed to account for the variation of the particle velocity during the impact. Based on the lubrication approximation, a semi-empirical model for the effective coefficient of restitution is proposed and integrated into the simulation. The numerical results obtained are in good agreement with the experimental results. Our method, therefore, provides a basis for investigating more complex wall-bounded particle-laden flows.
关键词	Lattice-boltzmann Simulation Efficient coEfficient Of Restitution Gravitational Settling Gravitational Rebound
课题组名称	LNM湍流
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/46896
专题	非线性力学国家重点实验室
通讯作者	Jin GD(晋国栋)
推荐引用方式 GB/T 7714	Jin GD,He GW,Zhang J. EFFICIENT COEFFICIENT OF RESTITUTION AND LATTICE-BOLTZMANN SIMULATION OF GRAVITATIONAL SETTLING AND REBOUND IN A VISCOUS FLUID[C]ICTAM 2012 Proceedings,2012.

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