Vortex shedding during the interaction of a turbulent wake with a cylinder

Experimental results investigating the vortex shedding behaviour during the interaction of a turbulent wake with a cylinder are presented. The wake was generated by a blunt ellipse and the cylinder placed at various distances behind its trailing edge. When the cylinder was placed greater than three diameters behind the trailing edge, two vortex shedding frequencies were detected in the wake, indicating that tandem bluff bodies need not shed at the same frequency. Further vortex shedding results are presented for the case when the cylinder was placed close to the trailing edge.