Numerical simulation of flow features and energy exchanging physics in near-wall region with fluid-structure interaction

Lixiang Zhang, Wenquan Wang, Yakun Guo

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Large eddy simulation is used to explore flow features and energy exchange physics between turbulent flow and structure vibration in the near-wall region with fluid–structure interaction (FSI). The statistical turbulence characteristics in the near-wall region of a vibrating wall, such as the skin frictional coefficient, velocity, pressure, vortices, and the coherent structures have been studied for an aerofoil blade passage of a true three-dimensional hydroturbine. The results show that (i) FSI greatly strengthens the turbulence in the inner region of y+ < 25; and (ii) the energy exchange mechanism between the flow and the vibration depends strongly on the vibration-induced vorticity in the inner region. The structural vibration provokes a frequent action between the low- and high-speed streaks to balance the energy deficit caused by the vibration. The velocity profile in the inner layer near the vibrating wall has a significant distinctness, and the viscosity effect of the fluid in the inner region decreases due to the vibration. The flow features in the inner layer are altered by a suitable wall vibration.
    Original languageEnglish
    Pages (from-to)651-670
    Number of pages20
    JournalInternational Journal of Modern Physics B
    Volume22
    Issue number6
    DOIs
    Publication statusPublished - 10 Mar 2008

    Fingerprint

    exchanging
    vibration
    physics
    fluids
    simulation
    interactions
    energy
    turbulence
    energy transfer
    structural vibration
    large eddy simulation
    blades
    turbulent flow
    vorticity
    low speed
    velocity distribution
    high speed
    vortices
    viscosity
    coefficients

    Keywords

    • turbulent flow
    • turbulent boundary layer
    • coherent structures
    • large eddy simulation
    • fluid structure interaction
    • turbulent-boundary-layer
    • drag reduction
    • DNS
    • oscillation
    • passage

    Cite this

    Numerical simulation of flow features and energy exchanging physics in near-wall region with fluid-structure interaction. / Zhang, Lixiang; Wang, Wenquan; Guo, Yakun.

    In: International Journal of Modern Physics B, Vol. 22, No. 6, 10.03.2008, p. 651-670.

    Research output: Contribution to journalArticle

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    abstract = "Large eddy simulation is used to explore flow features and energy exchange physics between turbulent flow and structure vibration in the near-wall region with fluid–structure interaction (FSI). The statistical turbulence characteristics in the near-wall region of a vibrating wall, such as the skin frictional coefficient, velocity, pressure, vortices, and the coherent structures have been studied for an aerofoil blade passage of a true three-dimensional hydroturbine. The results show that (i) FSI greatly strengthens the turbulence in the inner region of y+ < 25; and (ii) the energy exchange mechanism between the flow and the vibration depends strongly on the vibration-induced vorticity in the inner region. The structural vibration provokes a frequent action between the low- and high-speed streaks to balance the energy deficit caused by the vibration. The velocity profile in the inner layer near the vibrating wall has a significant distinctness, and the viscosity effect of the fluid in the inner region decreases due to the vibration. The flow features in the inner layer are altered by a suitable wall vibration.",
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    author = "Lixiang Zhang and Wenquan Wang and Yakun Guo",
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    N2 - Large eddy simulation is used to explore flow features and energy exchange physics between turbulent flow and structure vibration in the near-wall region with fluid–structure interaction (FSI). The statistical turbulence characteristics in the near-wall region of a vibrating wall, such as the skin frictional coefficient, velocity, pressure, vortices, and the coherent structures have been studied for an aerofoil blade passage of a true three-dimensional hydroturbine. The results show that (i) FSI greatly strengthens the turbulence in the inner region of y+ < 25; and (ii) the energy exchange mechanism between the flow and the vibration depends strongly on the vibration-induced vorticity in the inner region. The structural vibration provokes a frequent action between the low- and high-speed streaks to balance the energy deficit caused by the vibration. The velocity profile in the inner layer near the vibrating wall has a significant distinctness, and the viscosity effect of the fluid in the inner region decreases due to the vibration. The flow features in the inner layer are altered by a suitable wall vibration.

    AB - Large eddy simulation is used to explore flow features and energy exchange physics between turbulent flow and structure vibration in the near-wall region with fluid–structure interaction (FSI). The statistical turbulence characteristics in the near-wall region of a vibrating wall, such as the skin frictional coefficient, velocity, pressure, vortices, and the coherent structures have been studied for an aerofoil blade passage of a true three-dimensional hydroturbine. The results show that (i) FSI greatly strengthens the turbulence in the inner region of y+ < 25; and (ii) the energy exchange mechanism between the flow and the vibration depends strongly on the vibration-induced vorticity in the inner region. The structural vibration provokes a frequent action between the low- and high-speed streaks to balance the energy deficit caused by the vibration. The velocity profile in the inner layer near the vibrating wall has a significant distinctness, and the viscosity effect of the fluid in the inner region decreases due to the vibration. The flow features in the inner layer are altered by a suitable wall vibration.

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    KW - drag reduction

    KW - DNS

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