NUMERICAL-STUDIES ON THE TRANSIENT-BEHAVIOR OF A FIRE PLUME AND CEILING JET

Transient behaviour of a thermally induced fire plume and ceiling jet is predicted using the field modelling technique. In the field model, the k-epsilon model is used to simulate the turbulent air flow. The tr aditional wall-function approach is applied to describe the solid-wall boundary effect. The building concerned is composed of a floor and a ceiling, but is without walls. The height is varied from 3 m to 9 m. T ransient behaviour of air temperature, velocities, smoke concentration , etc., are predicted. The air entrainment rates to the fire plume and the entrainment constants are also calculated and compared with empir ical expressions.