稳定层结条件下建筑物体对流场影响的数值模拟研究

摘要/Abstract

摘要： 采用RNGk-ε湍流模型模拟不同理查森数(Ri_b)下立方体建筑物对流场结构的影响,并与相应的风洞实验结果进行了比较。CFD对归一化风速的数值模拟结果与风洞实验结果较好吻合;随着Ri_b的增大气流运动逐渐受浮力驱动,建筑物背风面的空腔区逐渐减小,特别是Ri_b ≥ 0.82时,浮力对流场的恢复起主导作用。Ri_b=0.21附近,流场结构从湍流对流场结构起主导作用转化成与层流类似,建筑物顶部的高归一化湍流动能(k/u_H²)区域随着回流区的消失而消失。随着下风向距离的增加,不同Ri_b对流场结构与k/u_H²的影响逐渐显现。

关键词: 数值模拟, 温度层结, 建筑物, 流动

Abstract: RNG k-ε turbulence model was used to simulate the influence of cube type building on the flow field structure under different Richardson numbers (Ri_b). And the results were compared with the corresponding wind tunnel results. The CFD numerical simulation results are in good agreement with the wind tunnel results. With the increase of Ri_b, the flow is gradually driven by buoyancy, and the cavity zone of the leeward side of the building is gradually reduced. Especially when Rib exceeds 0.82, buoyancy plays a leading role in the recovery of the flow field.When Ri_b is about 0.21, the structure of the flow field is transformed from turbulent flow to similar flow. The normalized turbulent energy(k/u_H²)high value area on the top of the building disappears with the disappearance of the re-circulation zone. With the increase of downwind distance, the influence of different Ri_b on the flow field structure and k/u_H² gradually appears.

Key words: numerical simulation, thermal stratification, building, flow

中图分类号:

X169

史学峰, 郭栋鹏, 李云鹏, 姚仁太. 稳定层结条件下建筑物体对流场影响的数值模拟研究[J]. 辐射防护, 2022, 42(4): 317-325.

SHI Xuefeng, GUO Dongpeng, LI Yunpeng, YAO Rentai. Study on numerical simulation of building influence on the flow field under stable stratification[J]. RADIATION PROTECTION, 2022, 42(4): 317-325.

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