Accession Number:

ADA276839

Title:

Vortex Generation and Wave-Vortex Interaction Over a Concave Plate with Roughness and Suction

Descriptive Note:

Contractor rept.

Corporate Author:

INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

42.0

Abstract:

The generation and amplification of vortices by surface inhomogeneities, both in the form of surface waviness and of wall-normal velocity, is investigated using the nonlinear PSE equations. Transients and issues of algebraic growth are avoided through the use of a similarity solution as initial condition for the vortex. In the absence of curvature, the vortex decays as the square root of 1x when flowing over streamwise aligned riblets of constant height, and grows as the square root of x when flowing over a corresponding streamwise aligned variation of blowingsuction transpiration velocity. However, in the presence of wall inhomogeneities having both streamwise and spanswise periodicity, the growth of the vortex can be much larger. In the presence of curvature, the vortex develops into a Goertler vortex. The direct and indirect interaction mechanisms possible in wave-vortex interaction are presented. The direct interaction does not lead to strong resonance with the flow conditions investigated. The indirect interaction leads to K-type transition. Transition, Wavy wall, Receptivity, Vortex, Wave vortex interaction

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE