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Position: Home > Articles > SPH-based Numerical Calculation of Sand Grain Velocity Distribution in Wind-blown Sand Flow Arid Zone Research 2018 (1) 107-113

基于SPH方法的风沙流中沙粒速度分布数值计算

作  者：
金阿芳;买买提明·艾尼;胡国玉;熊敏;马小晶
单  位：
新疆大学机械工程学院;新疆大学资源与环境科学学院;新疆大学电气工程学院
关键词：
风沙流;光滑粒子流体动力学(SPH)方法;沙粒速度;概率密度
摘  要：
沙粒速度是沙粒传输理论研究中的重要参数,它可以反映风沙两相流运动中微观运动和宏观运动的信息。本文运用光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)方法对风沙流动过程进行建模及数值计算,动态地显示跃移沙粒在整个风沙流过程中的运动状态,得到单个沙粒运动速度大小和方向的变化趋势,通过对单个沙粒的运动物理量进行统计分析,得到了沙粒群体运动行为的动力学特性。SPH方法的基本思想是将计算区域分解成独立的粒子,这些携带着自身质量,具有自身密度等物理特性的计算粒子可以随着控制方程运动,这点与自然界中沙粒的离散特点非常相符。本文针对SPH方法自身的关键因素进行了与风沙流特点相适应的改进和修正,使其在处理风沙流中两相物质的耦合时有它独到的优势。
译  名：
SPH-based Numerical Calculation of Sand Grain Velocity Distribution in Wind-blown Sand Flow
作  者：
JIN A-fang;Maimtimin Ayni;HU Guo-yu;XIONG Min;MA Xiao-jing;College of Mechanical Engineering,Xinjiang University;College of Resources and Environmental Science,Xinjiang University;College of Electricals Engineering,Xinjiang University;
关键词：
wind-blown sand movement;;smoothed particle hydrodynamic method;;sand grain velocity;;probability density
摘  要：
The wind-blown sand movement is a kind of air-sand two-phase flow problem. Under the action of air flow,sand grains experience a lift-off when they are changed from static state to movement. The research on lift-off of sand is very important in physics of wind-blown sand,and the distribution of the lift-off speed and the lift-off angle are the main physical factors and play an important role in deciding the motion state of sand in air. There are three types of sand movement in air flow,such as creep,suspension and saltation. Among them,the saltation accounts for about 75% of the wind-blown sand movement types. Tomaster mechanism of saltation can help us understand the law of wind-blown sand movement,and it can be used to further improve the study on the physics of wind-blown sand. There are two main reasons for the lift-off of sand,i. e.,fluid starting driven directly by air flow and the impact starting caused by other sand grains. Speed distribution function of sand can reflect the information of the macro-scale movement and the micro-scale movement in wind-blown sand movement. To determine the speed distribution function of the sand can work out the various macro-scale statistical variables. The Smoothed Particle Hydrodynamics( SPH) method,a Lagrange Particle method,was applied in this paper to dissect the mathematical model of wind-blown sand movement. The air and sand phases are dissected to single particles. The status of dissected sand grains was consistent with their natural status,so the sand movement can be accurately described. It is very simple and accurate to deal with the collision role by setting smoothing length. SPH method was firstly applied in the numerical simulation of gas-solid two-phase flow in this paper. In this study,the numerical simulation of wind-blown sand movement near the ground surface was performed to observe the micro-scale motion of sand,and to reveal the interaction mechanism of air flow and sand.

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