A numerical study on urban-like block arrays' drag force and its correlation with ventilation efficiency

M. Zhang, O. Palusci, R. Buccolieri, Z. Gao, X. Guo, J. Zhang

Research output: Contribution to journalConference Articlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number102009
JournalJournal of Physics: Conference Series
Volume2600
Issue number10
DOIs
StatePublished - 2023
Event2023 International Conference on the Built Environment in Transition, CISBAT 2023 - Hybrid, Lausanne, Switzerland
Duration: Sep 13 2023Sep 15 2023

ASJC Scopus subject areas

  • General Physics and Astronomy

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