Computational fluid dynamics study on two-phase CO<inf>2</inf> dispersion in a neutral atmosphere
conference paper
A large release of Carbon Dioxide (CO<inf>2</inf>) is modelled with Computational Fluid Dynamics (CFD), (Fluent v12.1). Special attention is given to the modelling of a neutral atmospheric boundary layer (ABL) with gravity. Both the presence of non-vapour CO<inf>2</inf> and the high density of CO<inf>2</inf> require that the effect of gravity is taken into account. The ABL describes the velocity and turbulence properties as a function of height, these strongly influence the mixing and dispersion of the hazardous substance with the surrounding air. Profiles for the ABL are obtained which are constant over the length of the calculation domain. The CO<inf>2</inf> release is modelled as both a gas release as a twophase release. The results are compared and the effects of the ABL and the single/two phase flow are discussed. In addition the results are compared to results obtained by another CFD code (CFX) and by a Gaussian method. Unfortunately no experiments with CO<inf>2</inf> are available yet to validate the developed model. However, the results from the verification are encouraging to continue the CFD study on CO<inf>2</inf>, with obstacles present. This advanced knowledge of CO<inf>2</inf> release behaviour could be applied to envisage stepwise a virtual accidental release in existing Urban or industrial areas.
Topics
TNO Identifier
527038
ISBN
9789608965065
Publisher
University of West Macedonia
Source title
HARMO 2011 - Proceedings of the 14th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes
Editor(s)
Bartzis J.G.
Andronopoulos S.
Syrakos A.
Andronopoulos S.
Syrakos A.
Pages
674-678
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