Accession Number:

AD0767602

Title:

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

Descriptive Note:

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

1973-05-01

Pagination or Media Count:

53.0

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

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE