管道壁面修饰减阻机理的数值模拟

NUMERICAL SIMULATION OF DRAG REDUCTION CAUSED BY PATTERNED WALL

用加入近邻相互作用势的格子玻尔兹曼方法模拟了表面修饰了去润湿性颗粒的二维管道内流体的流动.结果显示,管壁的粗糙度、修饰颗粒的润湿性、管内压强以及管内流体黏滞性等都是影响管内流体流速的因素.在一定压强下,管壁修饰疏水性的颗粒可以明显减小阻力,模拟结果也解释了开采地下油藏时存在启动压力梯度的原因.

A lattice Boltzmann method with the use of an interaction potential between neighboring lattice particles is applied to simulate the fluid flow in a 2-D wMl-patterned pipe. The simulation results indicate that the surface wettability, the surface roughness, the pressure and the fluid＇viscosity are the factors dominating the liquid-solid slip. The friction is reduced in the wall-patterned pipe under a low pressure. The simulation results can explain the existence of a threshold pressure gradient in mining underground reservoirs as well.