Large-scale simulations in underwater acoustics: methods, challenges and applications | Pavel Petrov

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Microwave Seminar at The Department of Physics & Engineering, ITMO | 08 Feb 2021

Timecodes are below the abstract.

Dr. Pavel Petrov
V.I. Il'ichev Pacific Oceanological Institute

Title: "Large-scale simulations in underwater acoustics: methods, challenges and applications"

Abstract: Present-day non-military applications of underwater acoustics requiring large-scale simulation of sound fields are discussed. Typical mathematical setting of sound propagation problem arising in such applications is considered, and various simplifications that do not significantly affect the accuracy of the solution while greatly reducing its computational cost are discussed. Typical inhomogeneities of the marine environment are also briefly considered. Several manifestations of the horizontal refraction effect caused by such inhomogeneities are outlined. The presentation is concluded by a couple of practical examples demonstrating the main challenges in the application of sound propagation models.

0:00:00 Intro
0:00:55 Part 1. Few words about the Pavel's Institution (POI)
0:03:27 Part 2. Introduction to the underwater acoustics
0:08:27 Applications of underwater acoustics
0:16:55 Part 3. Simulations and challenges of underwater acoustics
0:23:12 Example 1. Acoustic noise monitoring for marine fauna protection
0:25:19 Example 2. Computation of effective propagation velocities for a navigation source
0:29:00 Part 4. Sound propagation modelling
0:30:09 Main approaches
0:32:40 Questions from Alexey Slobozhanyuk on comparison numerical and experimental results
0:34:48 Mode parabolic equations
0:38:18 Sound propagation problem (math)
0:47:25 Question from the chat on attenuation coefficient and
1:00:32 Computational examples. Coastal wedge
1:02:40 Questions from the Dmitry Zhirihin on horisontal refraction.
1:07:15 Computational examples. Shallow sea with underwater canyon.
1:08:33 Computational examples. Whispering gallery formed near curvilinear isobath family.
1:11:33 Questions from Alexey Slobozhanyuk on experiments for underwater acoustics.
1:14:57 Questions from the Mikhail Fershalov (Does the method work with irregular grid?)
1:15:51 Questions from the Dmitry Zhirihin on noise level and operational frequency range
1:20:02 End

The Department of Physics and Engineering of ITMO University (Saint Petersburg, Russia) hosts online weekly seminars to discuss recent scientific achievements of researchers from all over the world with a wide audience. The topics include experimental (Optical seminar) and theoretical (Theoretical seminar) aspects of nanophotonics, solid-state physics, material science, as well as design and applications of radiofrequency structures and devices (Microwave seminar).

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