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    On the Structure of the Velocity Field over Progressive Mechanically-Generated Water Waves

    Source: Journal of Physical Oceanography:;1984:;Volume( 014 ):;issue: 012::page 1937
    Author:
    Papadimitrakis, Yiannis Alex
    ,
    Hsu, En Yun
    ,
    Street, Robert L.
    DOI: 10.1175/1520-0485(1984)014<1937:OTSOTV>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The structure of the velocity field over a propagating wave of fixed frequency is examined. The vertical and horizontal velocities were measured in a transformed Eulerian wave-following frame of reference in a wind-wave research facility at Stanford University. Experimental results are given for seven different wind speeds in the range 140?402 cm s?1, with 1 Hz, 2.54 cm nominal amplitude, mechanically-generated sinusoidal water waves. The mean velocity profiles have a log-linear form with a wake free-stream characteristic. The constant C which characterizes these profiles decreases with increasing wind speed, as a result of the variation of surface roughness condition between the transition region and the fully rough regime. The wave-associated stresses with their main component at twice the fundamental wave frequency were found to be significant. Therefore, the nonlinear terms encountered in the wave-induced Navier-Stokes equations associated with these stresses cannot be neglected, and linearization of the above equations is not permissible. The wave-induced velocity field and the wave-perturbed turbulence were found to depend significantly on the ratio of the wave speed to the mean free-stream wind velocity, c/Uδ0.
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      On the Structure of the Velocity Field over Progressive Mechanically-Generated Water Waves

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4163721
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    contributor authorPapadimitrakis, Yiannis Alex
    contributor authorHsu, En Yun
    contributor authorStreet, Robert L.
    date accessioned2017-06-09T14:47:19Z
    date available2017-06-09T14:47:19Z
    date copyright1984/12/01
    date issued1984
    identifier issn0022-3670
    identifier otherams-26789.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4163721
    description abstractThe structure of the velocity field over a propagating wave of fixed frequency is examined. The vertical and horizontal velocities were measured in a transformed Eulerian wave-following frame of reference in a wind-wave research facility at Stanford University. Experimental results are given for seven different wind speeds in the range 140?402 cm s?1, with 1 Hz, 2.54 cm nominal amplitude, mechanically-generated sinusoidal water waves. The mean velocity profiles have a log-linear form with a wake free-stream characteristic. The constant C which characterizes these profiles decreases with increasing wind speed, as a result of the variation of surface roughness condition between the transition region and the fully rough regime. The wave-associated stresses with their main component at twice the fundamental wave frequency were found to be significant. Therefore, the nonlinear terms encountered in the wave-induced Navier-Stokes equations associated with these stresses cannot be neglected, and linearization of the above equations is not permissible. The wave-induced velocity field and the wave-perturbed turbulence were found to depend significantly on the ratio of the wave speed to the mean free-stream wind velocity, c/Uδ0.
    publisherAmerican Meteorological Society
    titleOn the Structure of the Velocity Field over Progressive Mechanically-Generated Water Waves
    typeJournal Paper
    journal volume14
    journal issue12
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1984)014<1937:OTSOTV>2.0.CO;2
    journal fristpage1937
    journal lastpage1948
    treeJournal of Physical Oceanography:;1984:;Volume( 014 ):;issue: 012
    contenttypeFulltext
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