Journal of Fluid Mechanics


The control of naturally ventilated buildings subject to wind and buoyancy

a1 BP Institute, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, UK

Article author query
lishman b   [Google Scholar] 
woods aw   [Google Scholar] 


The competition between wind and buoyancy forces acting on a naturally ventilated building with one upwind and one downwind opening and a distributed heat source can lead to multiple steady states. This study considers the impact of a second downwind opening on the existence of these multiple steady states. It is found that if this new opening exceeds a critical area, then the multiple steady states are eliminated, and the transition from buoyancy to wind dominated flow is continuous. This critical area is shown to be a function of the relative heights of the three windows. The predictions of the model are in accord with new laboratory experiments, and the implications for building design are discussed.

(Published Online June 12 2006)
(Received June 5 2005)
(Revised December 1 2005)