Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30134
Title: Large eddy simulation of wind-induced interunit dispersion around multistory buildings
Authors: Ai, ZT
Mak, CM 
Keywords: Airborne infection
Computational fluid dynamics
Interunit dispersion
Large eddy simulation
Multistory buildings
Timescales
Issue Date: 2015
Publisher: Blackwell Munksgaard
Source: Indoor air, 2015 How to cite?
Journal: Indoor Air 
Abstract: Previous studies regarding interunit dispersion used Reynolds-averaged Navier-Stokes (RANS) models and thus obtained only mean dispersion routes and re-entry ratios. Given that the envelope flow around a building is highly fluctuating, mean values could be insufficient to describe interunit dispersion. This study investigates the wind-induced interunit dispersion around multistory buildings using the large eddy simulation (LES) method. This is the first time interunit dispersion has been investigated transiently using a LES model. The quality of the selected LES model is seriously assured through both experimental validation and sensitivity analyses. Two aspects are paid special attention: (i) comparison of dispersion routes with those provided by previous RANS simulations and (ii) comparison of timescales with those of natural ventilation and the survival times of pathogens. The LES results reveal larger dispersion scopes than the RANS results. Such larger scopes could be caused by the fluctuating and stochastic nature of envelope flows, which, however, is canceled out by the inherent Reynolds-averaged treatment of RANS models. The timescales of interunit dispersion are comparable with those of natural ventilation. They are much shorter than the survival time of most pathogens under ordinary physical environments, indicating that interunit dispersion is a valid route for disease transmission.
URI: http://hdl.handle.net/10397/30134
ISSN: 0905-6947
DOI: 10.1111/ina.12200
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

10
Last Week
0
Last month
0
Citations as of Mar 18, 2017

WEB OF SCIENCETM
Citations

7
Last Week
0
Last month
0
Citations as of Mar 25, 2017

Page view(s)

24
Last Week
1
Last month
Checked on Mar 26, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.