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Vortex-shedding frequency and Strouhal number
Inspired by the normalisation of the vortex-shedding frequency and its ensuing Strouhal number, the natural frequencies of the VIV systems of Figures 2.4 (a) and (b), fn, can be nondimensionalized to develop a new parameter for expressing VIV.
(d) Variations if vortex-shedding frequency (normalised with the natural frequency of structure) with Vr during IL (blue dash line) and CF (green line) VIV.
Normalising the vortex-shedding frequency by the natural frequency of the cylinders, the corresponding frequency response of the amplitude responses of Figure
At the end of the lock-in range, with further increase of Vr, the vortex-shedding frequency goes back to the Strouhal law and the amplitude of oscillations drops.
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