publication . Article . Other literature type . 2005

A PDF micromixing model of dispersion for atmospheric flow. Part I: development of the model, application to homogeneous turbulence and to neutral boundary layer

Massimo Cassiani; Pasquale Franzese; Umberto Giostra;
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  • Published: 26 Jan 2005 Journal: Atmospheric Environment, volume 39, pages 1,457-1,469 (issn: 1352-2310, Copyright policy)
  • Publisher: Elsevier BV
Abstract
A Lagrangian stochastic (LS) probability density function (PDF) model has been developed to study statistics and PDF of concentration generated by continuous releases of passive substances from point and line sources in atmospheric flow. The model simulates the combined effect of turbulent mixing (macromixing) and molecular diffusivity (micromixing) on dispersion of tracers. Turbulent dispersion is modelled using an LS model; molecular diffusivity is simulated by an interaction by exchange with the conditional mean (IECM) model. A dynamical computational grid, which expands with time around the plume, has been developed to optimise computational time and memory ...
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Subjects
arXiv: Physics::Fluid Dynamics
free text keywords: Atmospheric Science, General Environmental Science, Thermal diffusivity, Wind tunnel, Atmospheric dispersion modeling, Boundary layer, Turbulence, Chemistry, K-epsilon turbulence model, Micromixing, Planetary boundary layer, Statistical physics
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