EFFECTS OF INTERNAL HEATING ON THE DYNAMICS AND PATTERNS OF STRATIFIED WAKES
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Authors
Huang, Lianghai C.
Subjects
stratified wake
internal heating
propagating
detection
Massachusetts Institute of Technology General Circulation Model
MITgcm
internal heating
propagating
detection
Massachusetts Institute of Technology General Circulation Model
MITgcm
Advisors
Radko, Timour
Date of Issue
2020-09
Date
Sep-20
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
With advancing technology, submarines are getting quieter, and detection methods may need to include non-acoustical means. Wake detection is one such method that can be used for submarine detection. An internally heated submerged body such as a submarine travelling through stratified ocean columns generates a warm wake. Using the Massachusetts Institute of Technology General Circulation Model (MITgcm), we conducted a series of large eddy simulations to model the quantitative and qualitative effects of the warm wake produced by a towed spherical submerged body with a heating source. In this study, we studied the effects of varying the heating rate and noted that there are observable differences in the thermal anomaly between these cases during the early wake. At later times, heating of the wake does not seem to have a substantial effect on the thermal and turbulent characteristics of the wake. Distinctive loop shapes form in slices of the turbulent dissipation rate in all cases that may be used to easily identify submarine wakes. We also observed that the thermal anomaly is correlated to the submerged body's velocity and to higher background salinity gradients for comparable density stratification.
Type
Thesis
Description
Series/Report No
Department
Oceanography (OC)
Organization
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NPS Report Number
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Distribution Statement
Approved for public release. distribution is unlimited
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Copyright is reserved by the copyright owner.