Accession Number:

ADA014061

Title:

On Vortex Structure in the Wake of a Sphere.

Descriptive Note:

Technical rept. 1 May 74-30 Apr 75,

Corporate Author:

CATHOLIC UNIV OF AMERICA WASHINGTON D C HYDRODYNAMICS LAB

Personal Author(s):

Report Date:

1975-05-01

Pagination or Media Count:

25.0

Abstract:

This paper presents results showing the three-dimensional vortex shedding structure when a sphere is towed at a constant velocity through a stratified fluid. It is found that for certain Richardon and Reynolds numbers the vortex is shed three-dimensionally. The stratification however quickly inhibits the vertical motion and the initially turbulent wake collapses and reveals the vertically oriented portion of the vortex structure, reminiscent of two-dimensional vortex street behind a circular cylinder when viewed from above. Two branches of a double helix are continuously unwinding in an opposite sense from the formation region. The double helical model satisfies Thompsons circulation theorem.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE