Simulation of Multi-particle Dynamic Motion in Viscous Fluid
Date Issued
2011
Date
2011
Author(s)
Lin, Shin-Ruei
Abstract
This research focuses on three-dimensional simulation of the motion of multiple solid particles in viscous flow. By integrating discrete element method, lattice Boltzmann method and immersed boundary method to solve the interaction between solid particle and viscous fluid. To improve the efficiency of solving large scale model, this integrating scheme is implemented with parallel computing. The traditional immersed boundary method creates many integrating point to describe the solid boundary. And the bodies forces come from boundary are interpolated to the neighbor fluid nodes. However, the frequent interpolation will spend very much computing time. This research implements volume fraction function immersed boundary method. Volume fraction function is a more efficiency way to describe solid boundary effect in the fluid. This research simulates single particle sediment in a box, two particles’ DKT behavior and quick condition for particles. The simulating quick condition phenomenon is verified by the definition from soil mechanics. And we try to explain the mechanism which causes the quick condition for particles. The quick condition is not only cause by the normal stress in the direction of pressure difference. Institute fluid makes circulating flows in the spaces between particles. This flow cause torques to counter the friction forces between particles. The counter behavior will break the structure of particles’ configuration and makes quick condition occurs easier.
Subjects
Solid-liquid two-phase flow simulation
immersed boundary method
lattice Boltzmann method
discrete element method
quicksand
Type
thesis
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