Fluid flow induced by travelling waves in beam-like structures: modelling, simulation and experimental validation

Syuhri, Skriptyan Noor Hidayatullah (2022) Fluid flow induced by travelling waves in beam-like structures: modelling, simulation and experimental validation. PhD thesis, University of Glasgow.

Abstract

The configuration of a beam submerged in liquid can offer many advantages in engineering applications by providing an ability to generate alternative propulsion systems. These are achieved via travelling waves that propagate through the beam and, interacting with the surrounding fluid, generate thrust. Numerous concepts and implementations have been proposed differing in general arrangements that lead to different structural and fluid characteristics. Understanding the characteristics and limitations of travelling waves on the beam can provide advantages toward more effective and efficient actuations. The aim of this thesis is to provide insight into the mechanisms that allow structural travelling waves induced through electromagnetic actuation to interact with the surrounding fluid. This study would contribute to the development of controllable devices capable of self-propulsion.

In this thesis, the dynamic behaviours of a cantilever beam submerged in a fluid is approximated by simplifying fluid effects with hydrodynamic forces. Accordingly, the Galerkin-based model for fluid structure interaction can be derived and solved with a linear approximation method. This technique allows to investigate the vibration patterns of the beam under hydrodynamic loads that can be used to provide an assessment into factors affecting modal parameters and influencing the generation of travelling waves.

Advanced experimental techniques using Laser Doppler Anemometry (LDA) in conjunction with numerical simulation of fluid-structure interaction (FSI) models are used to provide a thorough and systematic characterisation of the fluid-structure interactions that constitute the fundamental of the correlation between structural travelling waves and thrust generated by a beam submerged in a viscous fluid. The discussion is expanded to consider the potential use of an additional mechanical element in attempting to improve features that promote travelling waves and large beam displacements without necessarily inducing high input power in a contactless actuation system.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Subjects: T Technology > T Technology (General)
• Colleges/Schools: College of Science and Engineering > School of Engineering
• Supervisor's Name: Cammarano, Dr. Andrea and Zare-Behtash, Dr. Hossein
• Date of Award: 2022
• Depositing User: Theses Team
• Unique ID: glathesis:2022-83283
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 30 Nov 2022 10:24
• Last Modified: 13 Dec 2022 12:21
• Thesis DOI: 10.5525/gla.thesis.83283
• URI: https://theses.gla.ac.uk/id/eprint/83283

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