风环境数值模拟中模拟植被的数学模型与应用  

Tree Canopy Model for Wind Environment Simulation and Its Application

作　　者：杨易[1] 顾明[2] 金新阳[1] 杨立国[1] 

机构地区：[1]中国建筑科学研究院风工程研究中心,北京100013 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2010年第9期1266-1270,共5页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(50708014);国家自然科学基金重大研究计划资助项目(90715040);"十一五"国家科技支撑计划资助项目(2006BAJ06B05;2006BAJ02A05)

摘　　要：在建筑风环境数值模拟中,植被的影响通常不可忽略,而且流经植被覆盖区的湍流流动非常复杂.为此,采用在动量和湍流输运方程中附加源/汇项的方法,结合粗糙壁面率修正,模拟植被绕流效应.首先基于剪切应力输运(shear-stress transport,SST)k(湍动能)-ω(耗散频率)模型,从理论上推导了湍动能耗散频率ω方程的新的附加源项模型;其次,采用数值模拟方法,以一植被挡风墙试验为例,对该模型进行了验证;最后,将模型应用到一高层建筑群风环境的数值模拟优化设计中.结果表明,该模型可以较准确有效地模拟建筑风环境中的植被效应,因而具有一定的理论和实用参考价值.Although the influence of tree canopy usually can not be ignored in the research on the wind environment around buildings,the numerical simulation of the turbulence flow over a vegetated surface is rather complicated.The method of adding additional source/sink terms in the turbulence and momentum transport equations combining with the roughness modification of wall boundary was applied to appropriately model the effect of the tree canopy.Firstly,the new additional source term model for the turbulence frequency ω equation in the Shear-Stress Transport（SST） k-ω model was proposed theoretically.Secondly,the new model was numerically verified by comparing with the experimental results of the windbreak flow.At last,the proposed source term model was employed in the optimization design of the wind environment around high-rise buildings.It is concluded that the new source term model is accurate and applicable for modeling the canopy flow,which provides a reference for the similar numerical researches on wind environment.

关 键 词：计算流体动力学 风环境 植被绕流 剪切应力输运k-ω模型 源/汇项 

分 类 号：TU973[建筑科学—结构工程]