Sarkar, Sunetra and Venkatraman, Kartik (2005) Numerical simulation of incompressible viscous flow past a heaving airfoil. In: International Journal for Numerical Methods in Fluids .
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Numerical simulations of a heaving airfoil undergoing non-sinusoidal motions in an incompressible viscous flow is presented. In particular, asymmetric sinusoidal motions, constant heave rate oscillations, and sinusoidal motions with a quiescent gap, are considered. The wake patterns, thrust force coefficients, and propulsive efficiency at various values of non-dimensional heave velocity are computed. These have been compared with those of corresponding sinusoidal heaving motions of the airfoil. It is shown that for a given non-dimensional heave velocity and reduced frequency of oscillation, asymmetric sinusoidal motions give better thrust and propulsive efficiencies in comparison to pure harmonic motion. On the other hand, constant rate heave motion do not compare favourably with harmonic motion. A train of sinusoidal pulses separated by a quiescent gap compares favourably with a pure sinusoidal motion, but with the notable exception that the quiescent gap induces a discontinuity that induces large impulses to the wake pattern.
| Item Type: | Journal Article |
|---|---|
| Publication: | International Journal for Numerical Methods in Fluids |
| Publisher: | John Wiley & Sons, Ltd. |
| Additional Information: | The copyright belongs to John Wiley & Sons, Ltd. At present only online publication information available |
| Keywords: | oscillating airfoil;unsteady aerodynamics;discrete vortex method |
| Department/Centre: | Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) |
| Date Deposited: | 24 Jan 2006 |
| Last Modified: | 27 Aug 2008 11:42 |
| URI: | http://eprints.iisc.ac.in/id/eprint/5191 |
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