Reattaching turbulent shear layers with perturbed structure
Abstract
The reattachment of a fully turbulent, twodimensional shear layer downstream of a backwardfacing step has been studied experimentally. The work examines the effect of modifications in shear layer structure upstream of reattachment. A series of experiments were conducted in a lowspeed wind tunnel using specialized instrumentation suited to the highly turbulent, reversing flow near reattachment. Accurate characterization of the timemean features of the reattaching flows was possible. Assuming linear scaling normalized on distance from reattachment, distributions of the normalized pressure coefficients, the timeaveraged skin friction coefficient, and the forward flow fraction appear universal for twodimensional reattachment, independent of initial conditions and steep height, for given duct geometry (area ratio) and for high step height Reynolds numbers. The results suggest universal flow structure in the reattachment zone.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1983
 Bibcode:
 1983aiaa.meetQQ...W
 Keywords:

 Backward Facing Steps;
 Reattached Flow;
 Shear Layers;
 Turbulent Flow;
 Two Dimensional Flow;
 High Reynolds Number;
 Wind Tunnel Tests;
 Fluid Mechanics and Heat Transfer