Modelling the effects of obstacles on the dispersion of denser-than-air gases
The three-dimensional, finite volume code ADREA-HF is used to perform a computational simulation of the Thorney Island Dense Gas Trial No. 21. In order to avoid excessively fine discretisation to model the thin circular fence and still take into account its real shape and dimensions, the computational cells which are in contact with the fence are characterised as blocked or partially blocked. In the blocked cells, the flow is completely obstructed, while in the partially blocked cells a flow resistance coefficient is evaluated. The above technique, in conjunction with a one-equation turbulence closure, gives satisfactory results in comparison with the experimental data in the form of concentration-time histories. The model has a tendency to underestimate the maximum gas concentration and the dose. The differences between model predictions and experimental data can be reduced by taking into account concentration fluctuation and by possible improvements of the tubulence modelling.
Bibliographic Reference: Article: Journal of Hazardous Materials, Vol. 37 (1994) pp. 327-352
Record Number: 199411228 / Last updated on: 1994-11-25
Original language: en
Available languages: en