Surface Signatures of Submerged Bodies Propagating in Stratified Fluids
Newman, Thomas P.
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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.
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