Accession Number : ADA192044

Title :   Fast Algorithm Development for Large-Eddy Simulation of Circular-Jet Turbulence.

Descriptive Note : Final technical rept. 15 Sep 85-14 Oct 87,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Krishnamurthy, L ; Hall, C A ; Porsching, T A

PDF Url : ADA192044

Report Date : Dec 1987

Pagination or Media Count : 30

Abstract : The research addresses a single, free, round turbulent jet expanding into a quiescent environment, and deals with the large scale motions through large eddy simulation and the small scale motions through subgrid-scale turbulence modeling. The computational fluid dynamic investigation of the nearfield downstream of an axisymmetric nozzle is based on a two dimensional procedure involving a variable reduction method, with the farfield fully developed flow structure analyzed by matched asymptotic expansions for large Reynolds numbers. The numerical algorithm development examines vectorization, three dimensional flowfield, and the construction of weakly dissipative difference methods. Keywords: Asymptotic structure, Circular jet; Fair field development; Fast algorithm; Free jet; Large eddy simulation.

Descriptors :   *ALGORITHMS, *EDDIES(FLUID MECHANICS), *FLUID DYNAMICS, ASYMPTOTIC SERIES, AXISYMMETRIC, COMPUTATIONS, DISSIPATION, EXPANSION, FINITE DIFFERENCE THEORY, FLOW, FLOW FIELDS, MATCHING, MOTION, NEAR FIELD, NOZZLES, NUMERICAL METHODS AND PROCEDURES, REDUCTION, REYNOLDS NUMBER, SCALE, SIMULATION, THREE DIMENSIONAL, TWO DIMENSIONAL, VARIABLES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE