Accession Number:

ADA231836

Title:

Unsteady Behavior of Turbulent Shear Flows

Descriptive Note:

Final technical rept. 1 May 1985-30 Apr 1990,

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE ENGINEERING

Report Date:

1990-07-25

Pagination or Media Count:

29.0

Abstract:

Theoretical studies on the temporal and spatial structure in blunt body wakes have revealed the necessary conditions under which global, self- sustained oscillations appear and have provided firm criteria for specifying the frequency of these oscillations. The theory has also been employed to describe the preferred mode in jets. In addition, a theoretical description of the appearance of the spatial chaos in wake-shear layers, and its representation in terms of a one-dimensional map, has been provided. An experimental facility and necessary instrumentation have been assembled and experiments are in progress on spatial chaos in wake-shear layers. Preliminary results have revealed a parameter domain where a temporal vacillation occurs between the Karman wake mode and the shear layer mode.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE