Referans Bilgileri

Integration of plume and puff diffusion models/application of CFD

Mori, A.

Atmospheric Environment

Cilt: 34, Sayı: 1, 45-49, 2000/01

The clinical symptoms of patients and other evidences of a gas poisoning accident inside an industrial building strongly suggested an abrupt influx of engine exhaust from a construction vehicle which was operating outside in the open air. But the obviously high level of gas concentration could not be well explained by any conventional steady-state gas diffusion models. The author used an unsteady-state continuous Puff Model to simulate the time-wise changes in air stream with the pollutant gas being continuously emitted, and successfully reproduced the observed phenomena. The author demonstrates that this diffusion formula can be solved analytically by the use of error function as long as the change in wind velocity is stepwise, and clarifies the accurate differences between the unsteady- and steady-states and their convergence profiles. Also, the relationship between the Puff and Plume Models is discussed. The case study included a computational fluid dynamics (CFD) analysis to estimate the steady-state air stream and the gas concentration pattern in the affected area. It is well known that clear definition of the boundary conditions is key to successful CFD analysis. The author describes a two-step use of CFD: the first step to define the boundary conditions and the second to determine the steady-state air stream and the gas concentration pattern.

Anahtar Kelimeler: Unsteady-state puff model; Plume model; CFD

Elsevier Science Ltd.

DOI: 10.1016/S1352-2310(99)00326-X

Makale

Dosyalar

İlgili Kayıtlar

Konu Başlıkları

Yorumlar