TY - JOUR
T1 - A numerical study on urban-like block arrays' drag force and its correlation with ventilation efficiency
AU - Zhang, M.
AU - Palusci, O.
AU - Buccolieri, R.
AU - Gao, Z.
AU - Guo, X.
AU - Zhang, J.
N1 - Publisher Copyright:
© 2023 Institute of Physics Publishing. All rights reserved.
PY - 2023
Y1 - 2023
N2 - This work conducted Computational Fluid Dynamics (CFD) simulations to investigate the drag force (F) and its relation to ventilation of four groups of urban-like block arrays with planar area index (λP) ranging from 0.0625 to 0.56. Simulations were performed employing the standard k-ε turbulence model after conducting a grid sensitivity test and validating the computational settings against wind tunnel data. The results showed that cases with larger λp, slab-shaped buildings, and staggered layout have higher values of F. As for the subcases within each group, F shows a significant increase for 0.0625 < λp < 0.25, and then only a slight increase for 0.25 < λp < 0.56; while the drag coefficient (Cd) shows a linear increase along with λp. The further linear regression analysis showed that the spatially averaged velocity and air change rate are strongly negatively correlated with F, which supports the effectiveness of F in reflecting ventilation efficiency, particularly for evaluating urban block-scale ventilation.
AB - This work conducted Computational Fluid Dynamics (CFD) simulations to investigate the drag force (F) and its relation to ventilation of four groups of urban-like block arrays with planar area index (λP) ranging from 0.0625 to 0.56. Simulations were performed employing the standard k-ε turbulence model after conducting a grid sensitivity test and validating the computational settings against wind tunnel data. The results showed that cases with larger λp, slab-shaped buildings, and staggered layout have higher values of F. As for the subcases within each group, F shows a significant increase for 0.0625 < λp < 0.25, and then only a slight increase for 0.25 < λp < 0.56; while the drag coefficient (Cd) shows a linear increase along with λp. The further linear regression analysis showed that the spatially averaged velocity and air change rate are strongly negatively correlated with F, which supports the effectiveness of F in reflecting ventilation efficiency, particularly for evaluating urban block-scale ventilation.
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U2 - 10.1088/1742-6596/2600/10/102009
DO - 10.1088/1742-6596/2600/10/102009
M3 - Conference Article
AN - SCOPUS:85180149399
SN - 1742-6588
VL - 2600
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 10
M1 - 102009
T2 - 2023 International Conference on the Built Environment in Transition, CISBAT 2023
Y2 - 13 September 2023 through 15 September 2023
ER -