Unsteady flow effects due to fluctuating wind pressures in natural ventilation design - instantaneous flow rates

The paper presents the results of a theoretical study into the effects of u nsteady wind pressures on the instantaneous flow rates in certain types of purpose-designed naturally ventilated buildings. The study used nondimensio nal parameters and the results should therefore cover a wide range of condi tions and should be of general application. The main concern is with the po tential for reducing the occurrence of instantaneous flow reversal through openings, by the use of long ducts instead of sharp-edged openings. It is c oncluded that substantial benefits can be achieved and the required conditi ons are defined in nondimensional terms. (C) 2000 Elsevier Science Ltd. All rights reserved.