A two-dimensional axial symmetric cloud dynamics model, which uses the Boussinesq approximation form of the equations of motion, was used to study downwash-induced fog clearings. The flow produced by constraining the vorticity to a prescribed value in a small region near the centerline of the model is similar to that observed to occur below a hovering helicopter. Several numerical experiments are discussed which show the efficacy of different hovering altitudes on the clearing of fog. The major feature affecting the size of clearing by helicopter downwash is the size of the primary downwash volume. (Modified author abstract)


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    Titel :

    Using Helicopters to Clear Fog: A Numerical Study


    Beteiligte:
    D. B. Johnson (Autor:in) / E. H. Barker (Autor:in) / P. R. Lowe (Autor:in)

    Erscheinungsdatum :

    1974


    Format / Umfang :

    40 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





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