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    Numerical Study of the Behaviors of Ventilated Supercavities in a Periodic Gust Flow

    Source: Journal of Fluids Engineering:;2020:;volume( 142 ):;issue: 006
    Author:
    Huang, Renfang
    ,
    Shao, Siyao
    ,
    Arndt, Roger E. A.
    ,
    Luo, Xianwu
    ,
    Wang, Yiwei
    ,
    Hong, Jiarong
    DOI: 10.1115/1.4046110
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: We conducted a numerical simulation of ventilated supercavitation from a forward-facing cavitator in unsteady flows generated by a gust generator under different gust angles of attack and gust frequencies. The numerical method is validated through the experimental results under specific steady and unsteady conditions. It is shown that the simulation can capture the degree of cavity shape fluctuation and internal pressure variation in a gust cycle. Specifically, the cavity centerline shows periodic wavelike undulation with a maximum amplitude matching that of the incoming flow perturbation. The cavity internal pressure also fluctuates periodically, causing the corresponding change of difference between internal and external pressure across the closure that leads to the closure mode change in a gust cycle. In addition, the simulation captures the variation of cavity internal flow, particularly the development internal flow boundary layer along the cavitator mounting strut, upon the incoming flow perturbation, correlating with cavity deformation and closure mode variation. With increasing angle of attack, the cavity exhibits augmented wavelike undulation and pressure fluctuation. As the wavelength of the flow perturbation approaches the cavity length with increasing gust frequency, the cavity experiences stronger wavelike undulation and internal pressure fluctuation but reduced cavitation number variation.
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      Numerical Study of the Behaviors of Ventilated Supercavities in a Periodic Gust Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4273211
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    contributor authorHuang, Renfang
    contributor authorShao, Siyao
    contributor authorArndt, Roger E. A.
    contributor authorLuo, Xianwu
    contributor authorWang, Yiwei
    contributor authorHong, Jiarong
    date accessioned2022-02-04T14:13:15Z
    date available2022-02-04T14:13:15Z
    date copyright2020/03/05/
    date issued2020
    identifier issn0098-2202
    identifier otherfe_142_06_061403.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4273211
    description abstractWe conducted a numerical simulation of ventilated supercavitation from a forward-facing cavitator in unsteady flows generated by a gust generator under different gust angles of attack and gust frequencies. The numerical method is validated through the experimental results under specific steady and unsteady conditions. It is shown that the simulation can capture the degree of cavity shape fluctuation and internal pressure variation in a gust cycle. Specifically, the cavity centerline shows periodic wavelike undulation with a maximum amplitude matching that of the incoming flow perturbation. The cavity internal pressure also fluctuates periodically, causing the corresponding change of difference between internal and external pressure across the closure that leads to the closure mode change in a gust cycle. In addition, the simulation captures the variation of cavity internal flow, particularly the development internal flow boundary layer along the cavitator mounting strut, upon the incoming flow perturbation, correlating with cavity deformation and closure mode variation. With increasing angle of attack, the cavity exhibits augmented wavelike undulation and pressure fluctuation. As the wavelength of the flow perturbation approaches the cavity length with increasing gust frequency, the cavity experiences stronger wavelike undulation and internal pressure fluctuation but reduced cavitation number variation.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical Study of the Behaviors of Ventilated Supercavities in a Periodic Gust Flow
    typeJournal Paper
    journal volume142
    journal issue6
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4046110
    page61403
    treeJournal of Fluids Engineering:;2020:;volume( 142 ):;issue: 006
    contenttypeFulltext
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