Accession Number : ADP001935

Title :   A Study of Non-Unique Solutions of the Two-Dimensional Boundary Layer Equations at Laminar Separation and Reattachment Points,


Personal Author(s) : Drela,M. ; Thompkins,W. T. , Jr

Report Date : 1981

Pagination or Media Count : 8

Abstract : The possibility of non-unique solutions to the laminar boundary equations in direct problem calculations has been identified for decelerating flow. For flows far from separation or reattachment one solution is physically reasonable and the others unrealistic. As a separation or reattachment point is approached, the multiple solutions approach each other and become identical. Understanding of this behavior allows direct problem calculations through separation, although such calculations are not practical. The computer code used to generate these results was developed to solve compressible, laminar or turbulent boundary layer and free wake problems in direct or inverse mode. The equation formulation uses a variable scaling based on the local displacement thickness rather than the more common Levy-Lees scaling or stream function form are possible.

Descriptors :   *Laminar boundary layer, Two dimensional flow, Flow separation, Boundary layer flow, Flow fields, Pressure distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE