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Document ID (ISN)111351
CIS number 11-0075
Year 2008
Convention or series no. HSE Research Report RR629
Author(s) Tickle G.A., Carlisle J.E.
Health and Safety Executive
Title Extension of the dense gas dispersion model DRIFT to include buoyant lift-off and buoyant rise
Bibliographic information HSE Books, P.O. Box 1999, Sudbury, Suffolk CO10 2WA, United Kingdom, 2008. viii, 74p. Illus. 63 ref.
Internet access Report_RR629.pdf [in English]
Abstract This report concerns the specification of equations extending the dense gas dispersion model DRIFT to include buoyant lift-off and rise. The lift-off modelling is based on that for a free buoyant cloud. Added mass terms are included in the model's vertical momentum equation since they offer the prospect of suppressing lift-off for wide clouds. The elevated continuous plume model is chosen to be similar to other published elevated plume models. The elevated instantaneous model is based on the puff model of Turner. The proposed model smoothly evolves between grounded and elevated phases. Passive spreading of the elevated cloud is based on a relative diffusion model. DRIFT's atmospheric profiles have been extended to above the surface layer and to include profiles of temperature and humidity.
Descriptors (primary) United Kingdom; air movement; gaseous effluents
Descriptors (secondary) mathematical models; research; report
Document type E - Books, reports, proceedings
Country / State or ProvinceUnited Kingdom
Subject(s) Toxic and dangerous substances
Broad subject area(s) Chemical safety
Browse category(ies) Air pollution