Trailing vortices in stratified fluids
By: T. Sarpkaya, S.K. Johnson
Contributors: Naval Postgraduate School (U.S.); Johnson, S. K.
Publisher: Naval Postgraduate School
Published: 1982
Place of publication: Monterey, California
Language: eng
Number of pages: 162
Subjects: Triangular Wings; Hydrodynamics; Vortex-motion; Aerodynamics; Airplanes; Stratified flow
Description: 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)
Notes: "NPS-69-82-003"--Cover.

Cover title.

"June 1982"--Cover.

"Prepared for: Defence Advanced Research Projects Agency, 1400 Wilson Blvd., Arlington, VA 22209."

Includes bibliographical references (126-130).

"Approved for public release; distribution is unlimited"--Cover.

Technical report; 1982.

ck/ 4/9/09.