温度层结下建筑物群周围流场影响的数值模拟研究

Abstract

Abstract: The RNG k-ε turbulence model was used to simulate the effect of thermal stratification on the flow field around buildings. The simulation results were validated by corresponding wind-tunnel experiment. The results showed that the CFD simulation results were consistent with the Yassin’s wind-tunnel experiment results. It is found that the velocity and turbulent kinetic energy in the building wake is the smaller under the stable stratification. Through the analysis of the simulation results under stable, neutral and unstable stratification, the influence of thermal stratification on the flow in the regular buildings matrix was studied. The results showed that the thermal stratification has a significant effect on the vortex intensity and the vertical distribution of longitudinal velocity in the street canyon. In particular, when the atmosphere is stable stratification, the attenuation effect of the building on the velocity is obvious.

Key words: numerical simulation, atmospheric stability, building, flow

CLC Number:

X169

GUO Dongpeng, WANG Ran, ZHAO Peng, LI Yunpeng, YAO Rentai, LIU Yao. Numerical simulation study on the effect of thermal stratificationon the flow field around buildings[J].RADIATION PROTECTION, 2020, 40(4): 290-300.

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Numerical simulation study on the effect of thermal stratificationon the flow field around buildings

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