Structural features of the near region of an asymmetric turbulent wake
Abstract
Statistical properties of the turbulent/nonturbulent interfaces in the near region of an asymmetric wake generated by a pair of closely-spaced, unequal-diameter cylinders have been determined by means of digital image analysis of cineflow visualization pictures of the flow. The results, comprising moments, burst rates, correlations and auto-spectra, indicate that the lower interface of the flow, which is associated with the large cylinder, has markedly steeper slopes, on the average, than the upper interface and its motion is considerably less random than that of the latter. Moreover, they establish that a 'Karman vortex street', centered in the lower part of the wake and with a characteristic frequency corresponding to a Strouhal number significantly less than that pertaining to the symmetric cylinder generated wake, is produced.
- Publication:
-
4th Symposium on Turbulent Shear Flows
- Pub Date:
- 1984
- Bibcode:
- 1984stsf.proc....5S
- Keywords:
-
- Cylindrical Bodies;
- Flow Geometry;
- Flow Visualization;
- Image Analysis;
- Turbulent Wakes;
- Asymmetry;
- Diameters;
- Digital Data;
- Fluid Boundaries;
- Karman Vortex Street;
- Strouhal Number;
- Fluid Mechanics and Heat Transfer