H15-54: Effect of wind fluctuations on near-range atmospheric dispersion under different types of thermal stratification

Lieven Vervecken, Johan Camps, Johan Meyers

    Research outputpeer-review

    Abstract

    When using the mean wind direction in Reynolds-averaged Navier-Stokes (RANS) simulations of atmospheric dispersion, it is well documented that peak concentration levels are often overestimated, and lateral spreading underestimated. Recently, it has been illustrated for neutrally stratified boundary layers that simulations improve significantly when the effective variability of wind directions, obtained by reducing the variability observed in experiments with the fluctuations predicted in the RANS turbulence model, is included in the boundary conditions. In the current work, we extend this approach towards thermally stratified boundary layers. We test the approach by performing a series of dispersion simulations of the Project Prairie Grass experiments, and demonstrate that also under these conditions the simulations improve markedly.

    Original languageEnglish
    Title of host publicationProceedings of the 15th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2013
    PublisherEnvironmental Software and Modelling Group
    Pages772-777
    Number of pages6
    StatePublished - 2013
    Event15th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2013 - Madrid
    Duration: 6 May 20139 May 2013

    Conference

    Conference15th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2013
    Country/TerritorySpain
    CityMadrid
    Period2013-05-062013-05-09

    ASJC Scopus subject areas

    • Atmospheric Science
    • Modelling and Simulation
    • Pollution

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