Date of Award:

8-2023

Document Type:

Dissertation

Degree Name:

Doctor of Philosophy (PhD)

Department:

Mechanical and Aerospace Engineering

Committee Chair(s)

Zhongquan Charlie Zheng

Committee

Zhongquan Charlie Zheng

Committee

John S. Allen

Committee

Som Dutta

Committee

Douglas Hunsaker

Committee

Juhyeong Lee

Committee

Tadd Truscott

Abstract

The aim of this study is to develop a numerical package that can simulate sound propagation in different media including air, water, porous materials, and metamaterials. Finite-difference time-domain (FDTD) method along with the immersed-boundary (IB) method are implemented in the realistic physical time and space domains for the purpose of numerically computing complex geometries with multiple media. The simulations include material changes such as air-water or air-porous material interfaces. Several applications are simulated in the regime of sound waves scattered by single to multiple air bubbles underwater and moving sources over complex structures. Those studies can be extended to real life applications such as fish bladder simulation, ocean geography, or migrating noise from flying-over unmanned aerial vehicles (UAVs) and domestic airplanes. Complex geometries are considered in the simulations including pulsing bubbles and geometries based on buildings. This package is capable of simulating events that previous numerical solvers or experiments were unable to perform. Novel discoveries, such as the interior gas motion of the bubbles, touching and merging bubbles, and phenomena from a moving source over different geometries and materials, are presented.

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5f89a463f9f6bf72726e5d6decc31a11

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