Publication

Abstract : Flow visualization studies have been carried out on an isolated square cylinder undergoing forced oscillation varying the frequency of oscillation. These are conducted to understand the flow-field features around a square cylinder in such situations enabling to assess the influence of forcing frequency on the flow field around the cylinder, in particular the mode of vortex shedding. Similar flow visualization studies have been conducted for a circular cylinder also, in an attempt to bring out the influence of geometry. Among many cases considered (within a range of excitation frequency), only a few typical cases have been presented here. Results indicate that the flow field around a square cylinder, in particular the mode of vortex shedding, is very much influenced by the excitation frequency. Comparison with the results on a circular cylinder reveals the influence of the body shape. Some comparative studies are also attempted with reference to earlier reported results.