Formation of secondary vortices in the wake of a cylinder impulsively set into motion
Abstract
A flow-visualization study was conducted on the evolution of the wake downstream of a circular cylinder set suddenly into motion and which moves in a direction perpendicular to its generators. The Reynolds number was in the range 300-5000. It was found that under certain conditions, one or several secondary vortices are formed in the attached wake region and near the points where the main flow separates from the cylinder. The time necessary for the length of the recirculation zone to reach a value equal to the cylinder diameter was measured as a function of Reynolds number. The curve decreases rapidly for Re up to 60, then increases rapidly up to about Re equals 500, and then continues to increase moderately.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie B Sciences Physiques
- Pub Date:
- January 1979
- Bibcode:
- 1979CRASB.288...45C
- Keywords:
-
- Circular Cylinders;
- Near Wakes;
- Secondary Flow;
- Vortices;
- Flow Visualization;
- Reattached Flow;
- Reynolds Number;
- Separated Flow;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer