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    Optical-Flow Algorithm for Near-Wake Analysis of Axisymmetric Blunt-Based Body at Low-Speed Conditions

    Source: Journal of Fluids Engineering:;2020:;volume( 142 ):;issue: 011::page 0111503-1
    Author:
    Tran, The Hung
    ,
    Chen, Lin
    DOI: 10.1115/1.4048145
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this study, ability of an optical-flow algorithm in extracting wake structure of axisymmetric model was investigated. The initial data for optical-flow processing were obtained in low-speed conditions by particle image velocimetry method. The Reynolds number based on the model diameter was around ReD = 1.97 × 104 in this study. Both the time-averaged and transient flow characteristics of near-wake flow were illustrated and examined by the optical-flow analysis method proposed. The processing results of optical-flow method showed good agreement with conventional cross-correlation methods. The ability of optical-flow method to extract flow fields was, thereby, confirmed for blunt-based flow at low-speed conditions. This study showed that the antisymmetric flow behavior of the near wake is the dominant type at low-speed conditions. Differing to traditional methods and cross-correlation results, the optical-flow results showed a frequency at around StD = 0.015 of the near wake for the first time, which is connected to vortex shedding behavior of the wake flow.
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      Optical-Flow Algorithm for Near-Wake Analysis of Axisymmetric Blunt-Based Body at Low-Speed Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4274703
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    contributor authorTran, The Hung
    contributor authorChen, Lin
    date accessioned2022-02-04T22:00:41Z
    date available2022-02-04T22:00:41Z
    date copyright8/28/2020 12:00:00 AM
    date issued2020
    identifier issn0098-2202
    identifier othergtp_142_09_091012.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274703
    description abstractIn this study, ability of an optical-flow algorithm in extracting wake structure of axisymmetric model was investigated. The initial data for optical-flow processing were obtained in low-speed conditions by particle image velocimetry method. The Reynolds number based on the model diameter was around ReD = 1.97 × 104 in this study. Both the time-averaged and transient flow characteristics of near-wake flow were illustrated and examined by the optical-flow analysis method proposed. The processing results of optical-flow method showed good agreement with conventional cross-correlation methods. The ability of optical-flow method to extract flow fields was, thereby, confirmed for blunt-based flow at low-speed conditions. This study showed that the antisymmetric flow behavior of the near wake is the dominant type at low-speed conditions. Differing to traditional methods and cross-correlation results, the optical-flow results showed a frequency at around StD = 0.015 of the near wake for the first time, which is connected to vortex shedding behavior of the wake flow.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOptical-Flow Algorithm for Near-Wake Analysis of Axisymmetric Blunt-Based Body at Low-Speed Conditions
    typeJournal Paper
    journal volume142
    journal issue11
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4048145
    journal fristpage0111503-1
    journal lastpage0111503-17
    page17
    treeJournal of Fluids Engineering:;2020:;volume( 142 ):;issue: 011
    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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