Trailing vortices in stratified fluids
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Authors
Sarpkaya, Turgut
Johnson, S. K.
Subjects
Stratified Flow
Trailing Vortices
Delta Wings
Vortex Pair
Trailing Vortices
Delta Wings
Vortex Pair
Advisors
Date of Issue
1982-06
Date
1982-06
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Experiments were conducted with two Delta wings and a streamlined body with lifting surfaces to investigate the evolution of turbulent trailing vortices in stratified and unstratified water. The vortex trajectories were determined as a function of the relative depth D/b sub o, normalized time V sub o t/b sub o, and the stratification parameter Nb sub o/V sub o. The results have shown that the vortices rise only to a finite height as they gradually demise under the influence of turbulence, sinusoidal instability, and the vortex breakdown. The effect of stratification is to reduce the lifespan of vortices and the maximum height attained by them. Various approximate analyses have been examined and new ones have been proposed to determine the lifespan of the vortices. Finally, an exploratory numerical analysis of the two-dimensional, unsteady laminar vortices has been carried out with encouraging results. (Author)
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS-69-82-003
Sponsors
supported by the Defense Advanced
Research Projects Agency (DARPA)
Funder
Format
Citation
Distribution Statement
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.