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    Oblique, Stratified Winds about a Shelter Fence. Part II: Comparison of Measurements with Numerical Models

    Source: Journal of Applied Meteorology:;2004:;volume( 043 ):;issue: 010::page 1392
    Author:
    Wilson, John D.
    DOI: 10.1175/JAM2147.1
    Publisher: American Meteorological Society
    Abstract: To evaluate Reynolds-averaged Navier?Stokes (RANS) models of disturbed micrometeorological winds, steady-state computations using a second-order closure are compared with observations (see Part I) in which the surface layer wind was disturbed by a long, thin porous fence (height h = 1.25 m; thickness dx ≈ 1 mm). Starting with the case of neutral stratification and normal incidence, it is shown that low-resolution RANS simulations (streamwise grid interval ?x/h = 1) produce reasonably good transects of mean wind speed, though with an ambiguity (or nonuniqueness) of at least 10%?15% of the amplitude of the relative wind curve, mainly arising from sensitivity to the choice of the solution mesh. For nearly perpendicular flows, the measured influence of stratification (stable or unstable) is to diminish the amplitude of the relative wind curve (i.e., windbreak is less effective), an effect that is replicated very well by the simulations. Obliquity of the incident wind, like stratification, also correlates with poorer shelter, but the computed response of the relative wind curve to obliquity is excessive. As for higher-order wind statistics, computed transects of velocity standard deviations compare poorly to those observed. Therefore, if this disturbed flow may be taken as representative, then caution must be recommended should it be thought that RANS-type models might be suitable (i.e., accurate, as well as convenient) for computing the disturbed wind statistics (typically mean velocity, shear stress tensor, and turbulent kinetic energy dissipation rate) that are needed to ?drive? modern dispersion models in the complex wind regimes that must be confronted in such contexts as urban dispersion, or the wind migration of pollen.
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      Oblique, Stratified Winds about a Shelter Fence. Part II: Comparison of Measurements with Numerical Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216269
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    contributor authorWilson, John D.
    date accessioned2017-06-09T16:47:18Z
    date available2017-06-09T16:47:18Z
    date copyright2004/10/01
    date issued2004
    identifier issn0894-8763
    identifier otherams-74083.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216269
    description abstractTo evaluate Reynolds-averaged Navier?Stokes (RANS) models of disturbed micrometeorological winds, steady-state computations using a second-order closure are compared with observations (see Part I) in which the surface layer wind was disturbed by a long, thin porous fence (height h = 1.25 m; thickness dx ≈ 1 mm). Starting with the case of neutral stratification and normal incidence, it is shown that low-resolution RANS simulations (streamwise grid interval ?x/h = 1) produce reasonably good transects of mean wind speed, though with an ambiguity (or nonuniqueness) of at least 10%?15% of the amplitude of the relative wind curve, mainly arising from sensitivity to the choice of the solution mesh. For nearly perpendicular flows, the measured influence of stratification (stable or unstable) is to diminish the amplitude of the relative wind curve (i.e., windbreak is less effective), an effect that is replicated very well by the simulations. Obliquity of the incident wind, like stratification, also correlates with poorer shelter, but the computed response of the relative wind curve to obliquity is excessive. As for higher-order wind statistics, computed transects of velocity standard deviations compare poorly to those observed. Therefore, if this disturbed flow may be taken as representative, then caution must be recommended should it be thought that RANS-type models might be suitable (i.e., accurate, as well as convenient) for computing the disturbed wind statistics (typically mean velocity, shear stress tensor, and turbulent kinetic energy dissipation rate) that are needed to ?drive? modern dispersion models in the complex wind regimes that must be confronted in such contexts as urban dispersion, or the wind migration of pollen.
    publisherAmerican Meteorological Society
    titleOblique, Stratified Winds about a Shelter Fence. Part II: Comparison of Measurements with Numerical Models
    typeJournal Paper
    journal volume43
    journal issue10
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/JAM2147.1
    journal fristpage1392
    journal lastpage1409
    treeJournal of Applied Meteorology:;2004:;volume( 043 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian