Lishman, Ben and Woods, Andrew W. (2009) On transitions in natural ventilation flow driven by changes in the wind. Building and Environment, 44 (4). pp. 666-673. DOI https://doi.org/10.1016/j.buildenv.2008.05.012
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Abstract
The interaction between wind and buoyancy in naturally ventilated buildings can lead to multiple steady states. Previous studies have shown that there may exist a stable wind-dominated regime, an unstable wind-dominated regime, and a stable buoyancy-dominated regime. Here we examine the transient evolution of the flow between these regimes as a result of changes in the wind forcing. We show that the transition from the wind-dominated regime to the buoyancy-dominated regime occurs as the wind forcing decreases below a critical value. However, the reverse transition, from the buoyancy-dominated regime to the wind-dominated regime, only occurs if there is a sufficiently large and rapid increase in the wind forcing. We calculate the instantaneous increase in wind forcing required for the system to evolve from the buoyancy-dominated regime to the wind-dominated regime, and we also determine the minimum rate of increase of the wind forcing for such a transition to occur. We discuss the implication of our results for building design.
Item Type: | Article |
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Uncontrolled Keywords: | 09AREP |
Subjects: | 99 - Other |
Divisions: | 99 - Other |
Journal or Publication Title: | Building and Environment |
Volume: | 44 |
Page Range: | pp. 666-673 |
Identification Number: | https://doi.org/10.1016/j.buildenv.2008.05.012 |
Depositing User: | Sarah Humbert |
Date Deposited: | 21 Jul 2010 15:03 |
Last Modified: | 23 Jul 2013 09:57 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/1487 |
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