Wind driven "pumping" fluid flow and turbulent mean oscillation across high-rise building enclosures with multiple naturally ventilated apertures. (October 2019)

• Record Type: Journal Article
• Authors: Zhong, Huai-Yu; Zhang, Dong-Dong; Liu, Yang; Liu, Di; Zhao, Fu-Yun; Li, Yuguo; Wang, Han-Qing
• Is Part Of: Sustainable cities and society. Volume 50(2019)
• Publication Date: 2019-10
• Subjects: Full CFD simulation -- Single-sided ventilation -- Vortex shedding -- Contaminant dispersion; Sustainable urban development -- Periodicals; Sustainable buildings -- Periodicals; Urban ecology (Sociology) -- Periodicals; 307.76
• DOI: 10.1016/j.scs.2019.101619
• Languages: English
• ISSNs: 2210-6707

Abstract

Highlights: Single-sided ventilations with two rear or front wall openings are compared. Pumping flow mechanism has been identified for different opening positions. Vortex shedding frequency heavily depends on incoming flow magnitude. Ventilation performance could be enhanced when openings are on the rear wall. Larger separation creates a sucking effect on the contaminant plume axes. Abstract: This paper presents a study on the impact of incoming wind velocity magnitudes and horizontal aperture separations on natural ventilation flows in a single-sided wind-driven naturally ventilated building with two apertures (SS2) on the rear wall or the front wall. Both the velocity fields and the contaminant concentration fields were simulated and investigated. The present study is based on CFD simulations with unsteady Reynolds-averaged Navier-Stokes (URANS) SST k-ω model. A vortex shedding flow mechanism has been identified when the two apertures are mounted either on the rear wall or on the front wall, through which the air flow oscillates at a certain rate. CFD results further demonstrate that the oscillating frequency increases with the incoming wind magnitude and is nearly independent of the horizontal aperture separations. For the same building configuration, the root mean square (r.m.s) of the non-dimensional ventilation flow rate is independent of the incoming wind speed, whereas it decreases when the horizontal aperture separation is reduced. The time-averaged contaminant concentration fields also validated the different ventilation performance of different aperture configurations. This novel ventilation mechanism could be applied to alleviate the poor ventilation performance of buildings with single-sided apertures.