H. Bestek, A. Thumm, H. Fasel

Laminar-turbulent transition phenomena in compressible flat-plate boundary layers are investigated by direct numerical simulations using the complete Navier-Stokes equations for three-dimensional compressible flows. The numerical method allows for investigations of spatially growing, three-dimensional disturbance waves in a two-dimensional growing boundary layer. In this paper results from simulations for two different types of breakdown to turbulence in a flat-plate boundary layer at M[infinity]=1.6 are presented. For the fundamental breakdown process initiated by a large amplitude two-dimensional wave plus a pair of small amplitude three-dimensional disturbance waves, the development of aligned lambda vortex structures similar to the ones in incompressible flows is observed. For a new type of breakdown initiated by only a pair of oblique waves, the simulations demonstrate the development of honeycomb-like structures Onstead of staggered or aligned lambda vortices) that were not observed before in other investigations.

First European Forum on Laminar Flow Technology, Hamburg, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

DGLR-Bericht, 1992, 1992-06, First European Forum on Laminar Flow Technology; S.184-192; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, boundary layer transition, laminar flow, Navier-Stokes equation

Bestellbar

1992