Environmental Engineering Reference
In-Depth Information
1.3 Simulation of Dense and Light Gas Dispersion
in Presence of Obstacles
D. Anfossi 1 , G. Tinarelli 2 , M. Nibar 3 , J. Commanay 4 , F. Ganci 5 ,
S. Trini Castelli 1 , L. Mortarini 1 , and P.A. Bretonnière 4
1
C.N.R.-ISAC, Torino, Italy
2
ARIANET, Milano, Italy
3
ARIA, Paris, France
4
JAPSYS-EADS, Suresnes, France; MATMECA, University Bordeaux 1, France
5
Politecnico di Torino, Italy
Abstract A new version of the Lagrangian Particle Dispersion Model SPRAY,
developed to silmulate the dispersion of dense and light emissions at microscale,
named MicroSpray is introduced. The first validation tests are presented.
Keywords Lagrangian Dispersion Model, microscale, buoyancy effects
1. Introduction
Hazardous toxic gases and vapours are produced and transported in modern
industry. In case of accidents the release and dispersion of hazardous substances
may cause severe problems to the populations living where such materials are
handled. In general, these hazardous clouds may be emitted initially denser or less
dense than the ambient air and, in some cases, because of high storage pressure,
may possess a very high initial speed. In particular, dense clouds disperse quite
differently from a neutral gas and, for instance, a significant upwind spread is
observed for near ground level sources. Thus, it is important to have a model able
to correctly estimate the area of critical concentration levels, in which population
might be seriously injured. Furthermore, in many cases, such as fast emergency
response or scenarios in complex terrain and obstacles, it is also important that the
model is fast. In this work we present an intercomparison of MSS (which include
the updated version of MicroSpray) with a CFD model (Mercure) in presence of
an obstacle, and a simulation of the Kit Fox experiments.
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