On Vortex Structure in the Wake of a Sphere.
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 Thompson's circulation theorem.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA014061
Entities
People
- Hsien-ping Pao
- Timothy W. Kao
Organizations
- The Catholic University of America