INFLUENCE OF ACCELERATION ON THE PATTERN AND DYNAMICS OF STRATIFIED WAKES

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Authors
Guerrero, Rino M.
Subjects
stratified wakes
MITgcm
internal velocity signatures
turbulence
acceleration
Advisors
Radko, Timour
Date of Issue
2018-06
Date
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Monterey, CA; Naval Postgraduate School
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Abstract
Submerged bodies traveling through stratified ocean columns generate remotely detectable wakes due to perturbations in temperature and momentum. Using the Massachusetts Institute of Technology General Circulation Model (MITgcm), a high-resolution 3D numerical ocean modeling program, simulations are run to model the quantitative and qualitative effects of a wake generated by accelerating submerged bodies. MITgcm was run on supercomputers at the University of Texas at Austin's Texas Advanced Computing Center and the Department of Defense High Performance Computing Modernization Program (HPCMP). The simulations modeled submerged bodies traveling at differing accelerating velocities or constant velocities. Wakes produced by accelerating bodies amplified the vorticity, thermal, and energy perturbation signatures. The stronger vortices concentrate the perturbations along the central wake, creating a narrower and more pointed wake front, whereas the wakes produced under constant velocity have weaker signatures, which are diffused across a broader wake front. The differences in wake signatures and wake shape can be detected using both acoustic- and non-acoustic-based methods and can be used operationally to determine the presence of acceleration within the incident submerged bodies.
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Thesis
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https://hdl.handle.net/10945/59671
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Approved for public release; distribution is unlimited.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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