Frequency lock-in is caused by coupled-mode flutter

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Computation of vortex-induced vibrations of long structures using a wake oscillator model: Comparison with DNS and experiments (2007, background): “This is under current investigation; see for instance [11].”
Effects of Wind on Plants (2008, background): “The fundamental mechanism of lock-in, which is essentially linear (de Langre 2006), is found in many flow-induced vibration issues, such as in vortex-induced vibrations.”
A review of recent studies on vortex-induced vibrations of long slender cylinders (2012, background): “Lock-in is the most distinct feature of VIV and is observed in numerous laboratory experiments and flow simulations involving cables, cantilevers, bridge models and elastically held cylinders (Blackburn and Henderson, 1996; de Langre, 2006; Feng, 1968).”
Mechanism of frequency lock-in in vortex-induced vibrations at low Reynolds numbers (2015, methodology): “This kind of solution is similar to the analysis results of De Langre (2006), in which he referred to this phenomenon as coupled-mode flutter.”
A harmonic-based method for computing the stability of periodic solutions of dynamical systems (2010, background): “This phenomenon is well known, especially when dealing with Flutter instabilities [18].”