Accession Number : ADA191743

Title :   Axisymmetric Viscid-Inviscid Interaction by a Frozen Vorticity Approximation.

Descriptive Note : Technical memo.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s) : Hoffman, G H

PDF Url : ADA191743

Report Date : 14 Jan 1988

Pagination or Media Count : 49

Abstract : A numerical solution procedure capable of a high degree of automation is presented for calculating the flow field associated with viscid-inviscid interaction on a body of revolution. The method makes use of ideas from asymptotic triple deck analysis of the trailing edge problem. A simpler problem is solved in which two layers are postulated, an outer inviscid, rotational layer (frozen vorticity) which largely governs the pressure in the trailing edge region, and an inner turbulent layer which is modeled in a simple manner. These two layers are patched at a fixed distance from the wall and wake centerline rather than asymptotically matched. The method allows the viscid-inviscid interaction solution to be computed in four interactions, none of which require any user intervention. A high degree of automation is achieved in the computer code because of three factors: (1) the solution cycle is very stable, (2) all calculations use a common streamwise grid, and (3) information is transferred to successive stages of the calculation by computer generated files. Numerical solutions are presented for three bodies and the results compared with published experimental data.

Descriptors :   *INTERACTIONS, *INVISCID FLOW, *VISCOUS FLOW, *VORTICES, ASYMPTOTIC SERIES, AUTOMATION, AXISYMMETRIC, BODIES OF REVOLUTION, COMPUTER FILES, COMPUTER PROGRAMS, CYCLES, EXPERIMENTAL DATA, EXTERNAL, FLOW FIELDS, GRIDS, INTERNAL, INTERVENTION, LAYERS, NUMERICAL ANALYSIS, NUMERICAL METHODS AND PROCEDURES, RANGE(DISTANCE), REGIONS, ROTATION, SOLUTIONS(GENERAL), TRAILING EDGES, TURBULENCE, USER NEEDS, WAKE, TIME STUDIES, POTENTIAL FLOW

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE