摘要
针对风雪流作用下低矮建筑屋面积雪分布特征预测问题,基于计算流体力学(computational fluid dynamics,CFD)与离散元方法(discrete element method,DEM)的耦合,研究了风雪流的数值模拟方法,包括风雪耦合状态下的流体运动方程、雪颗粒运动方程、流体-雪颗粒耦合控制方程及雪颗粒碰撞模型,建立了基于实测的雪颗粒材料参数、碰撞参数、边界控制条件和耦合计算方法等,并采用该方法对Tsuchiya阶梯型屋面的积雪模式进行了数值模拟。结果表明:模拟结果与野外实测及风洞试验结果取得了较好的一致性,验证了该方法的有效性;低屋面积雪对风场干扰较为显著,低屋面末端处的无量纲水平风速从无积雪分布时的-0.4增加为有积雪分布时的0,明显削弱了屋盖积雪区空气回流漩涡。
In order to predict snow distribution on a roof caused by snow drift, a simulation based on coupled CFD （computational fluid dynamics）and DEM（discrete element method）methods was employed. The numerical simulation method includes motion equations of fluid and snow particle, fluid-snow particle coupling control equation and snow particle collision model on the coupling condition. Coupled computing method, material parameters of snow particle, the parameters of the collision and border control conditions was built based on the measured results. A simulation of the snow drift adopting this method on a typical Tsuchiya stepped roof was done. Compared the simulated results of snow distribution on the lower roof with previous data from field measurement and wind tunnel test, the feasibility of using coupled CFD and DEM methods to study snow drift was demonstrated. Numerical simulation shows that baekflow whirlpool decreases obviously above the low roof due to the existence of snow, the nondimensional horizontal wind velocity on the end of the lower roof is -0. 4 when there is no snow distribution, but it increases to 0 with snow distribution.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第10期116-122,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51378428)
国家重点研发计划(2016YFC0802205)
