Accession Number : ADP001932

Title :   Interactive Separation from a Fixed Wall,

Corporate Author : SIBLEY SCHOOL OF MECHANICAL AND AEROSPACE ENGINEERING ITHACA NY

Personal Author(s) : Dommelen,L. L. van ; Shen,S. F.

Report Date : 1982

Pagination or Media Count : 11

Abstract : Numerically a solution is sought to describe the separation process from a fixed wall in the interaction region. Introduction of an analytical flow velocity in the external flow insures continuity, irrotationality and the correct asymptotic behaviour. In the boundary layer flow region, a finite difference procedure is employed. This procedure solves diffusion of vorticity rather than of momentum. It retains the full boundary layer equation in the region of reversed flow. The entire boundary layer flow region is mapped onto a finite computational domain in order to eliminate artificial cut-offs. Interactively, the external and boundary layer flows must agree on both pressure distribution and displacement effects. This agreement is here achieved by least square minimization of the differences. Preliminary results seem a significant step forward for both accuracy and computational efficiency and flexibility.

Descriptors :   *Boundary layer, Flow separation, Walls, Finite difference theory, Pressure gradients, Interactions

Distribution Statement : APPROVED FOR PUBLIC RELEASE