【摘要】 准确预测建筑屋盖表面和建筑周围的积雪空间分布形式是防止雪灾发生的重要手段。基于Euler-Euler方法,假定空气相和雪相均为连续相,运用计算流体力学软件FLUENT 17.0,采用Mixture多相流模型和k-kl-ω湍流模型模拟了立方体周围和高低屋盖表面的风致雪漂移。首先采用四组网格,以立方体为研究对象进行网格无关性验证;随后模拟了立方体周围风场并比较了迎风中线的平均风压系数,结果显示k-kl-ω湍流模型与实测结果吻合较好;最后模拟了立方体周围和高低屋盖表面的积雪分布并与实测和风洞试验结果进行了对比,侵蚀、沉积趋势一致。更多还原

【Abstract】 Accurately predicting snow spatial distribution forms on roof surface of a building and its surrounding is an important means to prevent snow disasters.Based on Euler-Euler method,assuming that both air phase and snow one are a continuous phase,the mixture multi-phase flow model and the k-kl-ω turbulence one were used to simulate wind snow drift around a building model by means of the computational fluid dynamics( CFD) software FLUENT 17.0.Firstly,taking a cube as the study object and using four groups of grid,the grid independence was verified.Then the wind field around the cube was simulated and the average wind pressure coefficients along the windward central line were compared,the results showed that the computational results of the k-kl-ω model agree well with those of the field measurement.Finally,the snow distributions around the cube and on the surfaces of a high roof and a low one were simulated,the results were compared with those of the field measurement and wind tunnel tests,it was shown that their erosion and deposition trends are consistent.更多还原