稳定层结条件下建筑物体对流场影响的数值模拟研究

Abstract

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

CLC Number:

X169

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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Study on numerical simulation of building influence on the flow field under stable stratification

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