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.
- Publication:
-
Journal of Fluid Mechanics
- Pub Date:
- September 2021
- DOI:
- 10.1017/jfm.2021.578
- arXiv:
- arXiv:2108.02090
- Bibcode:
- 2021JFM...923R...2Z
- Keywords:
-
- Physics - Fluid Dynamics;
- Nonlinear Sciences - Chaotic Dynamics
- E-Print:
- 11 pages, 6 figures