Accession Number:

AD0676066

Title:

VORTEX STREETS IN STABLY STRATIFIED FLUIDS,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH FLIGHT SCIENCES LAB

Personal Author(s):

Report Date:

1968-07-01

Pagination or Media Count:

33.0

Abstract:

Periodic vortices vortex street formed behind a circular cylinder in a flow of a stably stratified fluid with constant upstream velocity and density gradient are investigated experimentally. The vortices are elliptic in shape, and the vertical spacings between them decrease rapidly along the wake. The vortex street collapses into internal waves far downstream. The on-set of the vortex street is determined in terms of a stability parameter sigma Ri to the 12 powerLog10Re40, a function of Reynolds number Re and Richardson number Ri. It is found that for sigma 1, the flow is extremely stable and there are no periodic vortices formed in the wake. As sigma decreases to less than unity sigma 1, periodic vortices begin to appear in the wake. Author

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE