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Article Dans Une Revue Fluids Année : 2022

The Hydrodynamic Behavior of Vortex Shedding behind Circular Cylinder in the Presence of Group Focused Waves

Iskander Abroug
Nizar Abcha
Fahd Mejri
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Emma Imen Turki
Elena Ojeda
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  • PersonId : 1140116

Résumé

Vortex shedding behind an elastically mounted circular cylinder in the presence of group focused waves propagating upstream was investigated using a classical approach (time series and FFT) and nonclassical approach (complex 2D Morlet wavelets). Wavelet analysis emerged as a novel solution in this regard. Our results include wave trains with different nonlinearities propagating in different water depths and derived from three types of spectra (Pierson–Moskowitz, JONSWAP (γ = 3.3 or γ = 7)). It was found that the generated wave trains could modify regimes of shedding behind the cylinder, and subharmonic frequency lock-in could arise in particular situations. The occurrence of a lock-in regime in the case of wave trains propagating in intermediate water locations was shown experimentally even for small nonlinearities. Moreover, the application of time-localized wavelet analysis was found to be a powerful approach. In fact, the frequency lock-in regime and its duration could be readily identified from the wavelet-based energy and its corresponding ridges
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Dates et versions

hal-03511189 , version 1 (04-01-2022)

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Iskander Abroug, Nizar Abcha, Fahd Mejri, Emma Imen Turki, Elena Ojeda. The Hydrodynamic Behavior of Vortex Shedding behind Circular Cylinder in the Presence of Group Focused Waves. Fluids, 2022, 7 (1), ⟨10.3390/fluids7010004⟩. ⟨hal-03511189⟩
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