Numerical investigation of wind-induced airflow and interunit dispersion characteristics in multistory residential buildings

Zhengtao Ai, C. M. Mak, J. L. Niu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

AbstractCompared with the buoyancy-dominated upward spread, the interunit dispersion of pollutants in wind-dominated conditions is expected to be more complex and multiple. The aim of this study is to investigate the wind-induced airflow and interunit pollutant dispersion in typical multistory residential buildings using computational fluid dynamics. The mathematical model used is the nonstandard k-ε model incorporated with a two-layer near-wall modification, which is validated against experiments of previous investigators. Using tracer gas technique, the reentry of exhaust air from each distinct unit to other units on the same building, under different practical conditions, is quantified, and then, the possible dispersion routes are revealed. The units on the floor immediately below the source on the windward side, and vertically above it on the leeward side, where the reentry ratios are up to 4.8% and 14.9%, respectively, should be included on the high-infection list. It is also found that the presence of balconies results in a more turbulent near-wall flow field, which in turn significantly changes the reentry characteristics. Comparison of the dispersion characteristics of the slab-like building and the more complicated building in cross (#) floorplan concludes that distinctive infectious control measures should be implemented in these two types of buildings.
Original languageEnglish
JournalIndoor Air Online
Volume23
Issue number5
Pages (from-to)417-429
Number of pages13
ISSN1600-0668
DOIs
Publication statusPublished - 2013
Externally publishedYes

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