Accession Number : AD0750398

Title :   Numerical Investigation of Unsteady Boundary-Layer Separation,

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

Personal Author(s) : Telionis,D. P. ; Tsahalis,D. Th. ; Werle,M. J.

Report Date : SEP 1972

Pagination or Media Count : 33

Abstract : It has been previously indicated both theoretically and experimentally that for steady flow over moving boundaries, the vanishing of skin friction does not mean separation and that separation occurs at a station where the generalized Moore-Rott-Sears (MRS) criterion is satisfied. The authors have earlier indicated numerically that the Goldstein-type separation-singularity appears at the point where the MRS criterion is satisfied. In the present paper and in accordance with the theoretical work of Sears and one of the authors, this idea is extended to unsteady flows. A Goldstein-type of a traveling singularity is discovered and interpreted as 'unsteady boundary-layer separation.' The features of the flow in the neighborhood of this singularity are investigated. (Author)

Descriptors :   (*LAMINAR BOUNDARY LAYER, *FLOW SEPARATION), (*FLOW FIELDS, NUMERICAL ANALYSIS), SKIN FRICTION, VELOCITY, EQUATIONS OF MOTION, CURVE FITTING

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE