Largescale and smallscale turbulence structures in the intermediate wake of a twodimensional normal plate
Abstract
The properties of the velocity fluctuations in the wake of a normal flat plate were studied at eight heights downstream of it by decomposing the fluctuations into three components: the fundamental fluctuation, the largescale deviation, and the smallscale fluctuation. The Reynolds number based on the freestream velocity and the plate height was 23,000. The energy of the largescale deviation was found to be much greater than that of the smallscale fluctuation. The former attained maxima at the center of the coherent vortex. The Reynolds shear stress associated with this deviation also attained maxima near the saddle points, demonstrating that the largescale deviation is the major component of the velocity fluctuations in the intermediate wake. The energy of the smallscale structure is the smallest among the three components of the velocity fluctuations. Its maximum appears at a position off the vortex center.
 Publication:

JSME International Journal Series B
 Pub Date:
 June 1985
 Bibcode:
 1985JSMEB..28.1054K
 Keywords:

 Flow Geometry;
 Turbulent Wakes;
 Two Dimensional Flow;
 Flat Plates;
 Flow Velocity;
 Shear Stress;
 Vectors (Mathematics);
 Vorticity;
 Waveforms;
 Fluid Mechanics and Heat Transfer