Class
Article
College
College of Engineering
Department
Mechanical and Aerospace Engineering Department
Faculty Mentor
Zhongquan Zheng
Presentation Type
Poster Presentation
Abstract
The acoustic scattering of a resonant entity can be applied to various areas including underwater acoustics, biomedical acoustics, physical acoustics, and bioacoustics. It is convenient to detect mine under the seabed, school fish swim bladders, and diagnose human organs based on the voiceprint of their acoustic scattering. Therefore, understanding the behaviors and properties of scattering is important. Theoretical studies for scattering field outside an ideal spherical gas bubble have been well-developed and compared with numerous simulation and experimental researches, and the concept of shape factor was obtained for more general cases of an ideal gas bubble. The resonance frequency and the motion of a spherical bubble scattering incident plane wave can be solved explicitly using a set of eigenfunctions. In this study, acoustic scattering and resonances resulting from plane waves incident upon a gas bubble or a pair of gas bubbles are simulated using a time-domain simulation. The time histories of scattering pressure and velocity, both outside and inside the bubble, are obtained simultaneously from an immersed-boundary method allowing for the investigation of both exterior and interior fields with complex geometries. The acoustic resonances of the bubble are investigated for various bubble properties, and these are compared to the partial wave scattering solutions for spherical bubbles. Agreement is shown with the analytical solutions in the linear acoustic limit. In addition to scattering outside of the bubble, acoustic propagation inside the interior gas is investigated with respect to the monopole resonance. A significant advantage is that this time-domain simulation combined with the immersed-boundary method can be readily adapted for various shapes of bubbles and multiply bubbles. For these cases, the scattering and resonance behaviors are compared with the approximate analytical results using the shape factor method. The simulation can be extended to less studied shapes relevant to different acoustics applications.Presentation Time: Thursday, 1-2 p.m.Zoom link: https://usu-edu.zoom.us/j/87293114488?pwd=QmxrWlM0TnB1RWdPbnkvRE9WZEZIZz09
Location
Logan, UT
Start Date
4-11-2021 12:00 AM
Included in
Time-Domain Simulation of Acoustic Wave Scattering and Internal Propagation From Gas Bubbles of Various Shapes
Logan, UT
The acoustic scattering of a resonant entity can be applied to various areas including underwater acoustics, biomedical acoustics, physical acoustics, and bioacoustics. It is convenient to detect mine under the seabed, school fish swim bladders, and diagnose human organs based on the voiceprint of their acoustic scattering. Therefore, understanding the behaviors and properties of scattering is important. Theoretical studies for scattering field outside an ideal spherical gas bubble have been well-developed and compared with numerous simulation and experimental researches, and the concept of shape factor was obtained for more general cases of an ideal gas bubble. The resonance frequency and the motion of a spherical bubble scattering incident plane wave can be solved explicitly using a set of eigenfunctions. In this study, acoustic scattering and resonances resulting from plane waves incident upon a gas bubble or a pair of gas bubbles are simulated using a time-domain simulation. The time histories of scattering pressure and velocity, both outside and inside the bubble, are obtained simultaneously from an immersed-boundary method allowing for the investigation of both exterior and interior fields with complex geometries. The acoustic resonances of the bubble are investigated for various bubble properties, and these are compared to the partial wave scattering solutions for spherical bubbles. Agreement is shown with the analytical solutions in the linear acoustic limit. In addition to scattering outside of the bubble, acoustic propagation inside the interior gas is investigated with respect to the monopole resonance. A significant advantage is that this time-domain simulation combined with the immersed-boundary method can be readily adapted for various shapes of bubbles and multiply bubbles. For these cases, the scattering and resonance behaviors are compared with the approximate analytical results using the shape factor method. The simulation can be extended to less studied shapes relevant to different acoustics applications.Presentation Time: Thursday, 1-2 p.m.Zoom link: https://usu-edu.zoom.us/j/87293114488?pwd=QmxrWlM0TnB1RWdPbnkvRE9WZEZIZz09