Large-eddy simulations of wind flow passing a building cluster

Nguyen, Cung Huy; Lasagna, Davide; Xie, Zheng-Tong

Abstract

This paper presents high fidelity large-eddy simulations (LES) of wind flows with different directions passing a cluster of 2 × 2 aligned square cylinders, of which each has side length of D, at Reynolds number Re = 22, 000. A so-called 'cluster effect' has been found, in which the vortex structures in the far-field wake are governed by the cluster rather than individual cylinders. Their characteristic length and time scales are close to the cluster size 2D. The cluster effect increases monotonically as the flow incidence angle increases. Keywords: LES, building cluster, wake interaction 1. INTRODUCTION The aerodynamic behaviour and wake flow of a cluster of tall buildings is very complex due to strong interaction in the wake in both near and far fields. Understanding their aerodynamics is limited because of high cost of wind-tunnel experiments and numerical simulations. Using these approaches to study study wake flows of a cluster of tall buildings with Renoylds numbers larger than the critical one (Re ≈ 10 4) is very challenging. This is because it requires large testing sections and computational domain that available resources are very limited.

• Presentation Conference Type: Conference Paper (published)
• Conference Name: The 16th ICWE International Conference on Wind Engineering
• Start Date: Aug 27, 2023
• End Date: Aug 31, 2023
• Acceptance Date: Mar 31, 2023
• Online Publication Date: Aug 27, 2023
• Publication Date: Aug 27, 2023
• Deposit Date: Dec 20, 2023
• Publicly Available Date: Jan 2, 2024
• Publisher URL: https://web.aimgroupinternational.com/2023/icwe/papers/ICWE2023_AbstractSubmission-734_2023-04-17%2018_44_33.pdf