SPH numerical simulation study on wind-sand flow structure of multi-diameter sand
SPH numerical simulation study on wind-sand flow structure of multi-diameter sand
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DOI：
10.1007/s40571-022-00529-y
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发表时间：
2022-11
影响因子：
3.3
通讯作者：
Zhenguo An;A. Jin;Reyihanguli Musa
中科院分区：
文献类型：
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作者：
Zhenguo An;A. Jin;Reyihanguli Musa
采用平滑粒子流体动力学（SPH）方法对多直径沙体的风沙流运动进行数值模拟。该方法的主要特点是计算域的无网格离散化。问题域由一系列具有自己的物理属性和任意分布的粒子表示。该方法生产的颗粒可以赋予风沙流中沙子和空气的自然属性。通过求解每个颗粒，可以获得较为精确的数值解，因此SPH在风沙流微观研究中的应用可以精确跟踪单个沙粒的运动轨迹，这也是SPH在风沙流研究中的优势。阐述了多直径砂SPH方法的理论基础和具体方法，并对风沙流模型进行了优化，使多直径砂更符合砂床的自然堆积状态，风沙流模型的模拟结果更加准确、严谨。通过SPH数值模拟多直径砂体的风沙流结构，对模拟结果进行宏观和微观研究。与前人研究成果相比，验证了SPH方法在多直径砂风沙流数值模拟中的有效性。通过对比多直径砂体和单直径砂体的风沙流模拟结果，证实风沙流中考虑多直径分布的砂体的模拟结果比考虑单直径分布的砂体的模拟结果更准确。
Smoothed particle hydrodynamics (SPH) method is used to numerically simulate the wind-sand flow movement of multi-diameter sand. The main feature of this method is meshless discretization of computational domain. The problem domain is represented by a series of particles with their own physical properties and arbitrary distribution. Particles produced by this method can be endowed with the natural properties of sand and air in wind-sand flow. By solving each particle, a more accurate numerical solution can be obtained, so the application of SPH in the microscopic study of wind-sand flow can accurately track the trajectory of a single sand particle, which is also the advantage of SPH in the study of wind-sand flow. This paper expounds the theoretical basis and specific methods of SPH method for multi-diameter sand and optimizes the wind-sand flow model, so that the multi-diameter sand is more in line with the natural accumulation state of the sand bed, and the simulation results of the wind-sand flow model are more accurate and rigorous. Through the SPH numerical simulation of the wind-sand flow structure of multi-diameter sand, the simulation results are studied macroscopically and microscopically. Compared with the previous research results, the validity of the SPH method in the numerical simulation of wind-sand flow of multi-diameter sand is verified. By comparing the simulation results of the wind-sand flow of multi-diameter sand and single-diameter sand, it is confirmed that the simulation results considering sand with multi-diameter distributions are more accurate than those with single-diameter in the wind-sand flow.