Stratified flow past a submersible: vortical structures, modal analysis, wake turbulence and internal waves
Abstract
Stratified flow past a submersible: vortical structures, modal analysis, wake turbulence and internal wavesSOWFlow past submersibles in a stratified fluid involves various elements: the boundarylayer, its separation, the recirculation region, vortices shed off the body, the turbulentnear wake and, finally, the turbulent far wake. In a stratified background, the bodyFroude number (a measure of the strength of the flow shear relative to the buoyancyfrequency) determines which flow elements are affected by buoyancy and how.Spatially-evolving simulations of flow past bodies will be conducted to quantifybuoyancy effects on the coherent vortical structures, wake turbulence and internalgravity waves as a function of Froude and Reynolds number. In particular, we willexamine stratified flow past a prolate spheroid which is a problem where the flowphysics, in particular when the angle of attack is nonzero, remains to be discovered.Additionally, modern methods of data analysis will be employed to identify modes in theflow which are dynamically important and can be described by low-order models.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 29, 2020
- Source ID
- N000142012253
Entities
People
- Sutanu Sarkar
Organizations
- Office of Naval Research
- United States Navy
- University of California, San Diego