Experimental study on suppression of vortex street behind perforated square cylinder

In this study, the effects of entrainment of a fluid through a perforated surface on suppression
of the vortex street behind a perforated square cylinder have been studied experimentally.
The wake region has been investigated in terms of coherent flow structure, time averaged pro-
perties and effectiveness of different perforations. The quantitative measurements revealed
that the perforated surfaces are only effective within a width interval of y/D = ±1.0. It has
been observed that in the near wake region up to approximately 1.5D downstream the wake,
the shedding phenomenon has been suppressed significantly. It has been also demonstrated
that velocity profiles and flow structure have been affected by different perforated surfaces
and, as a result, coherent structures have been diminished considerably.