Accession Number : ADA322271

Title :   Direct Numerical Simulation of Flow Transition in Compressible Boundary Layer Around Airfoils.

Descriptive Note : Technical rept. 1 Mar-30 Sep 96,

Corporate Author : LOUISIANA TECH UNIV RUSTON

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

PDF Url : ADA322271

Report Date : FEB 1997

Pagination or Media Count : 45

Abstract : The three dimensional development of flow transition in both subsonic and supersonic Joukowsky airfoil boundary layers are studied by direct numerical simulation (DNS). The numerical simulation is performed by a spatial approach. A full compressible Navier Stokes system in curvilinear coordinates is employed so that we can simulate the transition around general geometric configurations. The numerical results agree very well with the linear stability theory (LST) at the linear growth stage for both primary and second modes in the flat plate boundary layers. The whole process of controlled flow transition induced by blowing/suction around airfoils is simulated by directly solving the N-S system with Reynolds number around one million. Some differences are found in comparison to the incompressible counterpart, and some new phenomena for the transition around airfoils are observed which at least qualitatively agree with physics.

Descriptors :   *AIRFOILS, *BOUNDARY LAYER TRANSITION, SPATIAL DISTRIBUTION, NUMERICAL ANALYSIS, NAVIER STOKES EQUATIONS, REYNOLDS NUMBER, INCOMPRESSIBLE FLOW, DIGITAL SIMULATION, BOUNDARY LAYER CONTROL, SUCTION SLOTS, THREE DIMENSIONAL FLOW, CURVES(GEOMETRY).

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE