Capturing the bi-stable asymmetry exchanges in the turbulent air wake of a simplified frigate using Large Eddy Simulation

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    Abstract

    Turbulent air wake of a Simplified Frigate Ship (SFS2) model is simulated using wall-resolved Large Eddy Simulation. The wake behind the superstructure presents an asymmetric configuration for an otherwise symmetric free stream condition. Bi-stable characteristics of the wake have also been simulated as evidenced by asymmetric state switching events. The wake behind the stern also exhibits bi-stable switching and adapts an opposite asymmetric orientation to the wake behind the superstructure, as also observed experimentally. The resulting time-averaged flow fields for each bi-stable state reveal a differential flux formation around the upstream sides of the superstructure. The instantaneous wake fields also suggest a possible influence of flow structures developed around the upstream end of the superstructure to generate a particular asymmetric wake state downstream.

    Original languageBritish English
    Article number109233
    JournalInternational Journal of Heat and Fluid Flow
    Volume104
    DOIs
    StatePublished - Dec 2023

    Keywords

    • Bi-stable air wake
    • Frigate
    • LES
    • SFS2
    • Wake asymmetry

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