Accession Number : ADA182314

Title :   Viscous Flow Around Wall Mounted Obstacles,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Schofield,W. H. ; Logan,E.

Report Date : SEP 1986

Pagination or Media Count : 87

Abstract : The flow field surrounding obstacles attached to a wall under a turbulent boundary layer is analysed. The analysis concentrates on how major features of the flow are influenced by model geometry and parameters of the incident boundary layers. Experimental data are analysed in terms of non-dimensionalized variables chosen on the basis that their effect on major flow features can be simply appreciated. Flow around two and three-dimensional objects are studied, singly and in groups, on smooth and rough walls, in boundary layer and pipe flow. The only restriction applied to the data is that the shear layer approaching the obstacle should be thicker than the height of the obstacle. This work shows that flow data from a wide range of flows can be collasped if the appropriate non-dimensional scales are used and, that the rate of recovery at any point downstream of a prism depends mainly on its relative proximity to the streamwise vortices in the flow. Numerous other particular conclusions are drawn. Keywords: Turbulent boundary layer, Pipe flow, Turbulent flow, Turbulence, Separation.

Descriptors :   *TURBULENT BOUNDARY LAYER, *VISCOUS FLOW, *BOUNDARY LAYER FLOW, BOUNDARY LAYER, FLOW, GEOMETRY, MODELS, PIPES, SHEAR PROPERTIES, THREE DIMENSIONAL, FLOW FIELDS, SCALE, RATES, RECOVERY, ROUGHNESS, WALLS, TURBULENCE, TURBULENT FLOW, THICKNESS, DATA REDUCTION, SCALING FACTORS, EXPERIMENTAL DATA, TWO DIMENSIONAL FLOW, THREE DIMENSIONAL FLOW, FLOW SEPARATION, SKIN FRICTION, AUSTRALIA, BARRIERS, MOBILIZATION, WALLS, RANGE(EXTREMES)

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE