Secondary instabilities of the in-phase synchronized wakes past two circular cylinders in side-by-side arrangement.
Journal of Fluids and Structures,
Global stability and sensitivity analysis of boundary-layer flows past a hemispherical roughness element.
Physics of Fluids,
Flow-induced vibrations of two side-by-side circular cylinders: Asymmetric vibration, symmetry hysteresis and near-wake patterns.
The onset of two-dimensional instabilities in the flow past two side-by-side circular cylinders is numerically investigated in the ranges
$0.1\leq g\leq 3$
being the non-dimensional gap spacing between the surfaces of the two cylinders and
the Reynolds number. A comprehensive, global stability analysis of the symmetric base flow is carried out, indicating that three harmonic modes and one steady antisymmetric mode become unstable at different values of
. These modes are known to promote distinct flow regimes at increasing values of
: single bluff-body, asymmetric, in-phase and antiphase synchronized vortex shedding. For each mode, the inherent structural sensitivity is examined in order to identify the core region of the related instability mechanism. In addition, by exploiting the structural sensitivity analysis to base flow modifications, a passive control strategy is proposed for the simultaneous suppression of the two synchronized shedding modes using two small secondary cylinders. Its effectiveness is then validated a posteriori by means of direct numerical simulations.
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