风雪运动数值模拟中自保持平衡边界条件研究  

A study on the self-sustaining equilibrium boundary condition of numerical simulation on snow drifting

作　　者：李雪峰[1,2] 周晅毅[1] 顾明[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]上海市城市建设设计研究院,上海200125

出　　处：《空气动力学学报》2011年第6期765-769,共5页Acta Aerodynamica Sinica

基　　金：科技部国家重点实验室基金(SLDRCE10-B-04;SLDRCE08-A-03);国家自然科学基金创新研究群体科学基金(50621062)

摘　　要：在目前风场自保持性研究的基础上,结合等效物理粗糙高度,给出一类近似满足自保持性的用于风雪运动数值模拟的边界条件。首先结合低温风洞实验室的风雪实验数据,把文献的方法应用于风雪运动数值模拟中。经对比验算发现,文献的方法应用于风雪数值模拟中不能很好满足自保持性。为了进一步满足自保持性要求,引入等效物理粗糙高度,建立起雪跃移高度与等效物理粗糙高度的关系。结果表明:通过引入等效物理粗糙高度,边界条件的自保持特性得到了进一步的提高。最后对该方法的应用进行了推广验证。Though adoption of the equivalent physical roughness height, a set of boundary condition, based on the current literature on the self-sustaining equilibrium boundary condition, is presented to simulate the wind field with snow movement,. In the paper, the method of the literature is applied to fit the data from snow drifting experiments in cold laboratory firstly. By comparison, the self-sustaining equilibrium is found not to be satisfied well. In order to reach the requirement of self-sustaining equilibrium, the equivalent physical roughness height is adopted, and the relationship between the equivalent physical roughness height and the saltation height is developed. The results show that self-sustaining equilibrium is improved though setting the equivalent physical roughness height reasonably. Finally, the popularization and application of the method is verified.

关 键 词：等效物理粗糙高度 平衡边界条件 风雪运动 雪跃移高度 

分 类 号：TU312.1[建筑科学—结构工程]