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- W1842896691 abstract "The wake flow around a circular cylinder at $Reapprox100$ performing rotatory oscillations has been thoroughly discussed in the literature, mostly focusing on the modifications to the natural B'enard-von K'arm'an vortex street that result from the forced shedding modes locked to the rotatory oscillation frequency. The usual experimental and theoretical frameworks at these Reynolds numbers are quasi-two-dimensional, since the secondary instabilities bringing a three-dimensional structure to the cylinder wake flow occur only at higher Reynolds numbers. In the present paper we show that a three-dimensional structure can appear below the usual three-dimensionalization threshold, when forcing with frequencies lower than the natural vortex shedding frequency, at high amplitudes, as a result of a previously unreported mechanism: a pulsed centrifugal instability of the oscillating Stokes layer at the wall of the cylinder. The present numerical investigation lets us in this way propose a physical explanation for the turbulence-like features reported in the recent experimental study of D'Adamo et al. (2011)." @default.
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- W1842896691 date "2015-06-01" @default.
- W1842896691 modified "2023-10-09" @default.
- W1842896691 title "Centrifugal instability of Stokes layers in crossflow: the case of a forced cylinder wake" @default.
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- W1842896691 doi "https://doi.org/10.1098/rspa.2015.0011" @default.
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