Influence of a Wall-Embedded Phononic Crystal on Tollmien-Schlichting Waves

Influence of a Wall-Embedded Phononic Crystal on Tollmien-Schlichting Waves

Angka Bayu Putranto, Angka (TU Delft Aerospace Engineering)

Kotsonis, M. (mentor)
Michelis, Theodorus (mentor)

Delft University of Technology

Aerospace Engineering | Aerodynamics

2021-12-17

This thesis concerns a numerical investigation for the stabilization (delay of laminar-to-turbulent transition) of ows over a at plate with a meta-unit of a possible metamaterial. The type of instability studied is that due to small disturbances in an incompressible, two-dimensional boundary layer. The linear growth of the disturbance in the form of a wave (also called the Tollmien-Schlichting wave) was of particular interest. There is a newly emerging class of structures called "metamaterials" which are capable of controlling the properties of classical waves (electromagnetic/optical/acoustic). This thesis investigates whether or not one of these materials are capable of attenuating TS waves. A literature review was conducted on three types of metamaterials, namely those based on Helmholtz-resonators, membranes structures and phononic crystals. The mechanisms for which the three aforementioned metamaterials attenuate acoustic waves are resonance, anti-resonance and Bragg's scattering respectively. Based on the likelihood of successfully achieving damping of TS waves, the phononic crystal was chosen to be further studied…

Tollmien-Schlichting waves
phononic crystals
fluid-structure interaction
resonance
Boundary Layer Transition

http://resolver.tudelft.nl/uuid:102306eb-3b75-49bd-a61e-ec8586cea1b6

Student theses

master thesis

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