Surface Signatures of Submerged Bodies Propagating in Stratified Fluids
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Authors
Newman, Thomas P.
Subjects
IDENTIFIERS SURFACE SIGNATURE
DIRECT NUMERICAL SIMULATION
DIMENSIONAL ANALYSIS
DIRECT NUMERICAL SIMULATION
DIMENSIONAL ANALYSIS
Advisors
Radko, Timour
Date of Issue
2014-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
A possible means of submersible detection is through the presence of surface signatures generated by a submerged body propagating in a stratified fluid. Direct numerical simulations (DNS) of perturbations generated by a submerged body can provide insight into how and when surface signatures occur based upon environmental conditions realized in the world's oceans. The use of realistic background stratifications is key to determining the significance of the phenomena to Navy operations and future research. This study employs a systematic DNS approach to diagnose the relationships between source speed/depth, mixed layer depth, temperature gradient, and Brunt-VΦaisΦalΦa frequency effects on resultant thermal and momentum surface signatures. Scope is limited to modeling of near-field wakes and analysis of resulting thermal and dynamic response. DNS is an extremely computationally expensive method for determination of surface signature occurrence and strength. Therefore, a predictive analytical algorithm, developed through dimensional analysis, is presented as an alternative to DNS.
Type
Thesis
Description
Series/Report No
Department
Oceanography
Organization
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NPS Report Number
Sponsors
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Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
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.