MPS-DEM方法数值模拟超长管道固液混输流动

Numerical simulation of solid-liquid mixed transport flow in ultra-long pipelines by MPS-DEM method

近些年来,深海矿产开发成为热点,其中涉及的固液混输问题逐渐引起学者的关注.如矿粒在海床上的输运,涉及水平管道的输运问题;矿粒从海床输运到海上浮式建筑物,涉及垂直管道的输运问题;矿粒在不同倾角管道内的输运,涉及倾斜管道的输运问题.对于该类问题,由于流体和固体之间的物理差异较大,对于固液两相往往采用不同的数值处理方法.本文使用MPS-DEM耦合方法模拟管道内的固液混输运动.用MPS方法模拟管道内流体的运动,用DEM方法追踪管道内颗粒的运动.在管道的进出口使用周期性边界条件,将多段管道之间进行拼接,从而实现了对超长管道内高雷诺数的颗粒输运现象的模拟.最后,分析管道颗粒和流场的速度及粒子分布等信息,分析流动特征.得到的结果会为超长管道内固液混输现象的研究提供一些借鉴意义及参考价值.

In recent years,the development of deep-sea minerals has gradually heated up,and the problem of solid-liquid mixed transportation involved has gradually entered people’s field of vision.For example,the transportation of ore grain on the seabed is through horizontal pipelines,while the transportation of ore grain from the seabed to floating structures is through vertical pipelines,and yet the transportation of ore grain at different inclination angles transport through inclined pipelines.For these problems,the fluid and solid phases are always treated by different numerical methods due to the large physical differences between them.In this paper,the transportation of the solid-liquid two-phase flow through a pipelines is simulated using MPS -DEM (Moving Particle Semi-implicit method-Discrete Element Method) coupling method.The fluid is simulated by MPS method,and the ore grain is tracked by DEM method.A periodic boundary condition is applied at the inlet and the outlet of the pipe,so that the ore grain transportation through an ultra-long pipeline can be simulated by jointing multiple pipes together.Finally,the distribution of velocity and pressure of the solid-liquid flow in the pipeline is analyzed,and the results obtained may provide some reference significance for the study of solid-liquid flow transportation in ultra-long pipelines.