Accession Number : AD0767602

Title :   Analytical Study of Subsonic Laminar Boundary Layer Separation and Reattachment Including Viscous-Inviscid Interaction,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Inger,G. R. ; Dutt,Birendra

Report Date : MAY 1973

Pagination or Media Count : 53

Abstract : An approximate analytical theory is developed for predicting nonsimilar laminar boundary layer flows with separation, reversed flow and reattachment including subsonic viscous-inviscid interation, with application to a separation bubble problem. The analytical approach is based on a triple-deck flow model, the boundary layer being divided into two layers overlaid by a third region of interacting inviscid flow. It is shown that this model has a heretofore-unrecognized double-branched solution character that enables it to pass through separation and reattachment without signularities and provide a unified description over a wide range of both attached and reversed flow states. An iterative stream-wise pass method of calculation is devised which is free from the usual Crocco-Lees critical points occurring in interaction problems. Application to a specific example involving a linear adverse pressure gradient yields results in good agreement with an exact Navier-Stokes solution. (Author)

Descriptors :   (*LAMINAR BOUNDARY LAYER, *SUBSONIC CHARACTERISTICS), FLOW SEPARATION, FLOW FIELDS, INTERACTIONS, MATHEMATICAL PREDICTION, SECONDARY FLOW, PRESSURE

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE