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

    Keywords

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

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