Accession Number:

ADA179578

Title:

Flow Dynamics Stimulated by Hairpin-Like Vortices in Initially Laminar Boundary Layers.

Descriptive Note:

Annual rept. 1 Feb 86-31 Jan 87,

Corporate Author:

SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT

Personal Author(s):

Report Date:

1987-02-28

Pagination or Media Count:

22.0

Abstract:

Time marching spatial simulations of flow events stimulated by hairpin like vortices in the near wall region of initially laminar boundary layers will be carried out. The behavioral flow characteristics and the underlying physical mechanisms will be elucidated by using three distinct but related methods of analysis. During the current reporting period, the development and improvement of the simulation and analysis tools have been completed. Simulations through the direct solution of time dependent, three dimensional, compressible Navier Stokes equations are being initiated. The successful completion of this effort will provide more insight into the cyclic turbulence production and transport in turbulent boundary layers. A better understanding of wall turbulence may lead to techniques of turbulence management and control which can impact upon a variety of current important technical problem areas. Keywords Organized flow events Hairpin vortices Direct numerical simulation.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE