Nonlinear fluid damping of elastically mounted pitching wings in quiescent water

Abstract

We experimentally study the nonlinear fluid damping of a rigid but elastically mounted pitching wing in the absence of a freestream flow. The dynamics of the elastic mount are simulated using a cyber-physical system. We perturb the wing and measure the fluid damping coefficient from damped oscillations over a large range of pitching frequencies, pitching amplitudes, pivot locations and sweep angles. A universal fluid damping scaling is proposed to incorporate all these parameters. Flow fields obtained using particle image velocimetry are analyzed to explain the nonlinear behaviors of the fluid damping.

11 pages, 6 figures

References in corpus (1)

• Dynamics of heavy and buoyant underwater pendulums

Cited by in corpus (3)

• Flow-induced oscillations of pitching swept wings: Stability boundary, vortex dynamics and force partitioning
• Force moment partitioning and scaling analysis of vortices shed by a 2D pitching wing in quiescent fluid
• A data-driven approach for modeling large-amplitude flow-induced oscillations of elastically mounted pitching wings