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    The Emergence of Coherent Structures in Stratified Shear Flow

    Source: Journal of the Atmospheric Sciences:;2001:;Volume( 058 ):;issue: 018::page 2790
    Author:
    Bakas, Nikolaos A.
    ,
    Ioannou, Petros J.
    ,
    Kefaliakos, George E.
    DOI: 10.1175/1520-0469(2001)058<2790:TEOCSI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Three-dimensional perturbations producing optimal energy growth in stratified, unbounded constant shear flow are determined. The optimal perturbations are intrinsically three-dimensional in structure. Streamwise rolls emerge as the optimally growing perturbations at long times, but their energy growth factor is limited by stratification to E = O(1/Ri), where Ri is the Richardson number. The perturbations that attain the greatest energy growth in the flow are combinations of Orr solutions and roll solutions that maximize their energy growth in typically O(10) advective time units. These optimal perturbations are localized in the high-shear regions of the boundary layer and are associated with strong updrafts and downdrafts that evolve into streamwise velocity streaky structures in the form of hairpin vortices in agreement with observations.
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      The Emergence of Coherent Structures in Stratified Shear Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159438
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    contributor authorBakas, Nikolaos A.
    contributor authorIoannou, Petros J.
    contributor authorKefaliakos, George E.
    date accessioned2017-06-09T14:37:08Z
    date available2017-06-09T14:37:08Z
    date copyright2001/09/01
    date issued2001
    identifier issn0022-4928
    identifier otherams-22933.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159438
    description abstractThree-dimensional perturbations producing optimal energy growth in stratified, unbounded constant shear flow are determined. The optimal perturbations are intrinsically three-dimensional in structure. Streamwise rolls emerge as the optimally growing perturbations at long times, but their energy growth factor is limited by stratification to E = O(1/Ri), where Ri is the Richardson number. The perturbations that attain the greatest energy growth in the flow are combinations of Orr solutions and roll solutions that maximize their energy growth in typically O(10) advective time units. These optimal perturbations are localized in the high-shear regions of the boundary layer and are associated with strong updrafts and downdrafts that evolve into streamwise velocity streaky structures in the form of hairpin vortices in agreement with observations.
    publisherAmerican Meteorological Society
    titleThe Emergence of Coherent Structures in Stratified Shear Flow
    typeJournal Paper
    journal volume58
    journal issue18
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2001)058<2790:TEOCSI>2.0.CO;2
    journal fristpage2790
    journal lastpage2806
    treeJournal of the Atmospheric Sciences:;2001:;Volume( 058 ):;issue: 018
    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
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