拉格朗日方法在风雪运动模拟中的应用  

APPLICATION OF LAGRANGIAN METHOD TO SNOWDRIFT MODEL

作　　者：周晅毅[1] 刘长卿[1,2] 顾明[1] 谭敏海[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]国内贸易工程设计研究院,北京100069

出　　处：《工程力学》2015年第1期36-42,共7页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51278368;51478359);科技部国家重点实验室基金项目(SLDRCE14-B-10)

摘　　要：采用拉格朗日方法,模拟空旷场地中雪颗粒从开始运动至整个流域达到平衡状态的过程。分析了雪颗粒的运动特性,结合文献中的击溅函数,追踪每个跃移雪颗粒的运动状态,同时考虑了跃移雪颗粒对风场的修正作用。考察了在风雪流发展过程中跃移雪颗粒的数目、质量传输率和摩擦速度的变化规律,以及流域达到平衡状态后跃移雪颗粒质量通量沿高度的分布。同时将数值模拟结果与文献中的实测结果进行了详细的对比,两者吻合较好。Based on the Lagrangian method, the development process of snowdrift in an open field is modelled. The characteristics of snow particles are analyzed, and the motion of each snow particle is tracked, in which a splash function is adopted. At the same time, the influence of snow particles on a wind field is taken into account. The variation of the number of saltation particles, the mass transport rate, the friction velocity and snow mass flux distribution along the height at a steady state are studied. The computational results in this paper agree well with the field measurement results in other literatures.

关 键 词：拉格朗日方法 数值模拟 风雪运动 摩擦速度 质量传输率 

分 类 号：P425.64[天文地球—大气科学及气象学]