Frequency and phase lock-in behind circular cylinder in the presence of random irregular waves - Normandie Université Access content directly
Journal Articles Physical Review Fluids Year : 2022

Frequency and phase lock-in behind circular cylinder in the presence of random irregular waves

Iskander Abroug
Nizar Abcha

Abstract

In this paper, we present the influence of irregular random waves on the von Kármán street in the wake of an elastically mounted cylinder. The flow is perpendicular to the long axis of the cylinder which is constrained to oscillate transversally. In our experiments, the generated waves are derived from Pierson-Moskowitz and Joint North Sea Wave Project spectra. It was found that the increase of the nonlinearity of the generated waves is accompanied by a decrease of the shedding frequency to half of the pic frequency of the generated waves. Furthermore, the Hilbert transformation was performed to calculate the continuous phases of irregular waves and that of the Kármán vortex street. The temporal evolution of the phase combination has been investigated as well. It was found that the time evolution of θ has a steplike shape, i.e., when θ=0, this corresponds to a synchronizationlike effect. This approach enables the temporal variability of the synchronization to be quantified in the presence of random irregular waves.
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Dates and versions

hal-03895497 , version 1 (12-12-2022)

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Iskander Abroug, Nizar Abcha. Frequency and phase lock-in behind circular cylinder in the presence of random irregular waves. Physical Review Fluids, 2022, 7 (6), pp.064801. ⟨10.1103/PhysRevFluids.7.064801⟩. ⟨hal-03895497⟩
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