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Flow-induced vibrations of a pitching and plunging airfoil. (English) Zbl 1460.76084

Summary: The flow-induced vibration (FIV) of an airfoil freely undergoing two-degrees-of-freedom (2-DOF) motions of plunging and pitching is numerically investigated as a function of the reduced velocity and pivot location in a two-dimensional free-stream flow. This investigation covers a wide parameter space spanning the flow reduced velocity range of \(0<U^* =U/(f_nc)\leqslant 10\) and the pivot location range of \(0\leqslant x\leqslant 1\), where \(U\) is the free-stream velocity, \(f_n\) is the natural frequency of the system set equal in the plunge and pitch directions, \(c\) is the chord length of the foil and \(x\) is the normalised distance of the pivot point from the leading edge. The numerical simulations were performed by employing an immersed boundary method at a low Reynolds number \((Re=Uc/ \nu =400\), with \(\nu\) the kinematic viscosity of the fluid). Through detailed analyses of the dynamics of the 2-DOF vibrations and wake states, a variety of FIV response regimes are identified, including four regions showing synchronisation or near-synchronisation responses (labelled as S-I, S-II, S-III and S-IV) and four transition regimes (labelled as T-I, T-II, T-III and T-IV) that show intermittent, switching or chaotic responses, in the \(x-U^*\) space.

MSC:

76B10 Jets and cavities, cavitation, free-streamline theory, water-entry problems, airfoil and hydrofoil theory, sloshing
74F10 Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.)
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