动态阻力系数模型在沙生柔性植物模拟中的应用与验证  

Application and validation of the varied porosity model in simulating sand-grown flexible plant

作　　者：孙嘉梁 黄宁[1] 赵昱豪 裴斌斌 张洁 Sun Jialiang;Huang Ning;Zhao Yuhao;Pei Binbin;Zhang Jie(MOE Key Laboratory of Mechanics on Disaster and Environment in Western China/College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室/土木工程与力学学院,甘肃兰州730000

出　　处：《中国沙漠》2025年第1期215-228,共14页Journal of Desert Research

基　　金：国家重点研发计划项目(2023YFF1304203);国家自然科学基金项目(41931179,42376232);第二次青藏高原综合科学考察研究项目(2019QZKK020611)。

摘　　要：湍流作用下柔性植物的摆动效应会影响其防风固沙效果。基于传统多孔介质模型,开发描述植物摆动效应的动态阻力系数模型,并对植物柔韧性进行了参数化,提高了防风固沙工程设计的准确性。通过大涡模拟计算,分析不同摆动频率和幅度的植物对冠层流特征区域的影响。结果表明:柔性植物在冠层内部和近尾流区的平均速度更小,但脉动速度和湍动能更大。柔性植物周围的地表剪切应力更小,在尾流区有较好的庇护效果。高柔韧性植物在冠层顶部形成乱流区,在背风侧近尾流区产生强阵风,会降低该区域的防护效果。The swaying effects of flexible plants under turbulent flow conditions can affect their wind erosion control effectiveness.This study develops a varied porosity model based on the traditional porous media model to describe the flexural movement of plants,and parameterizes plant flexibility to improve the accuracy of wind ero-sion control engineering design.Large eddy simulation(LES)is conducted to analyze the impact of plants with different oscillation frequencies and amplitudes on canopy flow characteristics.Results show that flexible plants exhibit lower mean velocities within the canopy and in the near-wake region,but higher fluctuating velocities and turbulent kinetic energy.The surface shear stress around flexible plants are also smaller,providing better sheltering effects in the wake region.Highly flexible plants form turbulent zones at the top of the canopy and gen-erate strong gusts in the near-wake region on the leeward side,partially reducing the protective effect in this area.

关 键 词：柔性植物 多孔介质模型 湍流结构 防风效益 风廓线 

分 类 号：P931.3[天文地球—自然地理学]