Accession Number : ADA194017

Title :   Computation of Low Speed Viscous Flows with Heat Addition,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Hosangadi, Ashvin ; Merkle, Charles L

PDF Url : ADA194017

Report Date : Jan 1986

Pagination or Media Count : 6

Abstract : The use of implicit time-dependent schemes for the numerical solution of low speed, low Reynolds number flows with heat addition is investigated. Stability analyses show that the errors introduced by approximate factorization give rise to instability at Reynolds numbers around 100. Specifically, it is the cross-derivative errors between the viscous and inviscid terms that cause problems. When exact inversion techniques are used, the system becomes strongly stable and numerical experiments show rapid convergence. Comparisons of outflow boundary conditions show that viscous and inviscid formulations give identical results over a wide range of Reynolds numbers when buoyancy is omitted, but with buoyance present the inviscid boundary conditions are unstable. Flowfield results for a range of low Reynolds conditions with and without buoyancy are given to show the manner in which the flowfield changes as these physical parameters are varied.

Descriptors :   *VISCOUS FLOW, *HEAT FLUX, ADDITION, BOUNDARIES, BUOYANCY, CONVERGENCE, FLOW FIELDS, FORMULATIONS, HEAT, INVERSION, INVISCID FLOW, LOW VELOCITY, NUMERICAL ANALYSIS, NUMERICAL METHODS AND PROCEDURES, PHYSICAL PROPERTIES, RANGE(EXTREMES), REYNOLDS NUMBER, SOLUTIONS(GENERAL), STABILITY, TIME DEPENDENCE, VISCOSITY, THERMAL PROPERTIES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE