Accession Number : ADA309978

Title :   Direct Numerical Simulation for the Receptivity and the Whole Process of Transition Around Joukowsky Airfoils.

Descriptive Note : Technical rept. 1 Oct 94-29 Feb 96,

Corporate Author : COLORADO UNIV AT DENVER

Personal Author(s) : Liu, Chaoqun ; Liu, Zhining ; Xiong, Guohua

PDF Url : ADA309978

Report Date : MAY 1996

Pagination or Media Count : 47

Abstract : The two- and three-dimensional development of leading-edge receptivity and transition in a 2-D Joukowsky airfoil boundary layer are investigated by direct numerical simulation (DNS) using the incompressible Navier-Stokes equations. The numerical investigation are based on the so-called spatial approach. A contravariant based governing system is derived so that we can simulate the receptivity and transition with complex geometries. The numerical results agreed very well with the experimental results for the flat plate case, and also agreed well with the result obtained by other researchers for the 2-D elliptic leading-edge receptivity case. Some new phenomena for the transition around Joukowsky airfoils were observed which at least qualitatively agree with physics.

Descriptors :   *AIRFOILS, *BOUNDARY LAYER TRANSITION, MATHEMATICAL MODELS, ALGORITHMS, COMPUTERIZED SIMULATION, SPATIAL DISTRIBUTION, TIME DEPENDENCE, GRIDS, EDDIES(FLUID MECHANICS), COMPUTATIONAL FLUID DYNAMICS, FLOW FIELDS, PERTURBATIONS, LEADING EDGES, TWO DIMENSIONAL FLOW, NAVIER STOKES EQUATIONS, FREE STREAM, FLOW SEPARATION, PRESSURE DISTRIBUTION, MAPPING(TRANSFORMATIONS), INCOMPRESSIBLE FLOW, BOUNDARY LAYER FLOW, FLAT PLATE MODELS, THREE DIMENSIONAL FLOW, CONFORMAL MAPPING.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE