COMPUTATIONAL MODELING OF THE TRANSIENT-RESPONSE OF BUILDING INTERNAL-PRESSURE TO A SUDDEN OPENING

This paper describes the computational and experimental modelling of t he transient response of internal pressures to sudden openings in buil dings and models. It is shown that the computer model correctly predic ts both the Helmholtz frequency and the decay rate of internal pressur e. A study of the flow patterns from the computational results also sh ow that a vena-contracta forms in the oscillating how following a sudd en opening. It is thought that viscous losses may be important and new analytic models have therefore been suggested which have been used to obtain a match with the experimental results.