Author(s)

M. Ayrault, S. Simoens & P. Mejean

Abstract

Dispersion of dense gas releases downwind of solid obstacles M. Ayrault", S. Simoens", P. Mejean"^ " Laboratoire de Mecanique des Fluides et France Ecully, France ABSTRACT An experimental study of the effects of solid fences on the dispersion of continuous releases with density greater than environment is presented. Comparison with the dispersion in flat terrain for the same initial densities clearly shows the effects of obstacles and comparison with passive plumes exhibits the specific effects of buoyancy. We particularly study the height and width evolutions of plumes, the mean concentration fields and the standard deviation fields. INTRODUCTION Dispersion of dense plumes or clouds depends upon the external wind speed and turbulence, the initial density, the initial conditions of release and the boundary conditions. Generally, due to the negatively buoyancy, they cover a large surface area with a limited vertical depth. Furthermore, most accident

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