Accession Number : ADA137029

Title :   A Synthesized Model of the Near-Wall Behavior in Turbulent Boundary Layers.

Descriptive Note : Interim rept.,

Corporate Author : LEHIGH UNIV BETHLEHEM PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS

Personal Author(s) : Smith,C R

PDF Url : ADA137029

Report Date : Jan 1984

Pagination or Media Count : 28

Abstract : A model of the near-wall behavior of turbulent boundary layers is presented. Based on an extensive series of primarily visualization experiments, which are described in overview, the model proposes a sequence of events which give rise to the bursting behavior responsible for turbulence production in the near-wall region. The model illustrates how hairpin vortex flow structures, generated during low-speed streak break down and ejection, are also reponsible for the streak regeneration process, thus defining a clear cycle of turbulence generation for the near-wall region. (Author)

Descriptors :   *Turbulent boundary layer, *Boundary layer transition, *Vortices, *Flow visualization, Walls, Fluid mechanics, Coherence, Structural properties, Turbulent flow, Models, Screens(Displays), Video recording, Probes, Bubbles, Hydrogen, Ejection, Statistical analysis

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE