Date of Award
2024
Degree Type
Thesis
Degree Name
Master of Science in Ocean Engineering
Department
Ocean Engineering
First Advisor
Jason Dahl
Abstract
Acoustic metamaterials (AMs) have been proposed for uses in flow control, as they offer a passive control method and can be engineered independently, without needing complex fluid structure interactions simulations. For example, AMs embedded into flat plate surfaces have been demonstrated to delay (or speed up) the onset of laminar-to-turbulent boundary layer transition by attenuating (or strengthening) Tollmein-Schlicting waves through numerical simulation. However, as of present, no experimental research has been conducted to study or demonstrate the behaviors of AMs designed to interact with flow structures. An experiment was performed in which an AM was embedded into a flat plate with a circular cylinder positioned near the surface upstream to generate oscillatory flow instabilities at a controlled frequency. The effectiveness of the AM to attenuate the artificially introduced instability waves from the vortices shed off of the cylinder was evaluated over a range of flow speeds, vortex shedding frequencies, and cylinder positions using measurements made with 2-D particle image velocimetry. It was found that the AM could successfully attenuate instabilities with the target frequency band and affect the wake of the cylinder in certain conditions.
Recommended Citation
McTighe, Jensen E., "CONTROL OF FLOW INSTABILITIES WITH ACOUSTIC METAMATERIALS" (2024). Open Access Master's Theses. Paper 2519.
https://digitalcommons.uri.edu/theses/2519
Included in
Aerodynamics and Fluid Mechanics Commons, Materials Science and Engineering Commons, Ocean Engineering Commons
Comments
Controlled Unclassified Information (CUI) has been removed from thesis PDF.