Vortex-induced vibrations of a long flexible cylinder in shear flow
By Rémi Bourguet, G. Em Karniadakis, Michael S. Triantafyllou. Journal of Fluid Mechanics, 2011
184 citations recorded by the source corpus.
We investigate the in-line and cross-flow vortex-induced vibrations of a long cylindrical tensioned beam, with length to diameter ratio L/D = 200, placed within a linearly sheared oncoming flow, using three-dimensional direct numerical simulation. The study is conducted at three Reynolds numbers, from 110 to 1100 based on maximum velocity, so as to include the transition to turbulence in the wake. The selected tension and bending stiffness lead to high-wavenumber vibrations, similar to those encountered in long ocean structures. The resulting vortex-induced vibrations consist of a mixture of standing and travelling wave patterns in both the in-line and cross-flow directions; the travelling wave component is preferentially oriented from high to low velocity regions. The in-line and cross-flow vibrations have a frequency ratio approximately equal to 2. Lock-in, the phenomenon of self-excited vibrations accompanied by synchronization between the vortex shedding and cross-flow vibration frequencies, occurs in the high-velocity region, extending across 30% or more of the beam length. The occurrence of lock-in disrupts the spanwise regularity of the cellular patterns observed in the wake of stationary cylinders in shear flow. The wake exhibits an oblique vortex shedding pattern, inclined in the direction of the travelling wave component of the cylinder vibrations. Vortex splittings occur between spanwise cells of constant vortex shedding frequency. The flow excites the cylinder under the lock-in condition with a preferential in-line versus cross-flow motion phase difference corresponding to counter-clockwise, figure-eight orbits; but it damps cylinder vibrations in the non-lock-in region. Both mono-frequency and multi-frequency responses may be excited. In the case of multi-frequency response and within the lock-in region, the wake can lock in to different frequencies at various spanwise locations; however, lock-in is a locally mono-frequency event, and hence the flow supplies energy to the structure mainly at the local lock-in frequency.
Subfields: Computational Mechanics, Computer Networks and Communications, Control and Systems Engineering
View Paper: https://www.semanticscholar.org/paper/87b371a5b50002c6624fc305b78cb6145ea5435c
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Citations in the corpus
- Deep learning of vortex-induced vibrations (2018, unknown): “, an elastically mounted cylinder [38].”
- An experimental investigation on vortex induced vibration of a flexible inclined cable under a shear flow (2015, methodology): “Chen et al. / Journal of Fluids and Structures ] (]]]]) ]]]–]]] 2 inclined cable are large enough to excite two and more vibration modes, the inclined cables will behave in a multi-mode VIVs. Furthermore, Chen et al. (2013) indicated that the inclined cables with a length of 100 mwould behave in mon”