The present paper describes the results of a numerical study of the flow field generated by the oscillations of a thrusting foil. The investigation is carried out to see whether a transition from a periodic flow to an aperiodic chaotic flow is present as observed around oscillating cylinders. Moreover, the transition process is analysed in detail and the characteristics of the system attractor are determined as function of the parameters of the problem. The approach considers a two-dimensional problem. Such purely two-dimensional method of calculation describes the main features of the phenomenon but does not provide a complete and accurate description of the flow, because it takes into account only the cross-stream wake vorticity (at right angles to the direction of motion) although in reality trailing vorticity (parallel to the direction of motion) can appear even when a 2-D foil is considered. Notwithstanding the above limitations, a two-dimensional approach can provide useful information on the overall vorticity dynamics and on the forces acting on the foil and it is the necessary introduction to full 3-D simulations.

Chaotic flow generated by an oscillating foil

BLONDEAUX, PAOLO;
2005-01-01

Abstract

The present paper describes the results of a numerical study of the flow field generated by the oscillations of a thrusting foil. The investigation is carried out to see whether a transition from a periodic flow to an aperiodic chaotic flow is present as observed around oscillating cylinders. Moreover, the transition process is analysed in detail and the characteristics of the system attractor are determined as function of the parameters of the problem. The approach considers a two-dimensional problem. Such purely two-dimensional method of calculation describes the main features of the phenomenon but does not provide a complete and accurate description of the flow, because it takes into account only the cross-stream wake vorticity (at right angles to the direction of motion) although in reality trailing vorticity (parallel to the direction of motion) can appear even when a 2-D foil is considered. Notwithstanding the above limitations, a two-dimensional approach can provide useful information on the overall vorticity dynamics and on the forces acting on the foil and it is the necessary introduction to full 3-D simulations.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/210809
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