Surface Signatures of Submerged Bodies Propagating in Stratified Fluids
Newman, Thomas P.
MetadataShow full item record
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.
Approved for public release
Showing items related by title, author, creator and subject.
Haun, Erlina A. (Monterey, California. Naval Postgraduate School, 2012-09);Self-propelled, submerged bodies travelling in thermohaline staircases generate evident temperature and velocity perturbations on the surface of the ocean, which may lead to possible airborne detection methods of underwater ...
Elnitsky, John II. (1987-09);The trailing vortices generated by the control planes of submarines give rise to surface signatures in the form of scars and striations. Two counter-rotating vortices were generated in a novel experimental system and their ...
Martin, Michael A. (Monterey, California: Naval Postgraduate School, 2016-06);Submerged bodies propagating in stratified fluids frequently create disturbances in temperature, salinity, and momentum that are detectable at the air-sea interface. This project includes the addition of momentum excess ...