Effective Control of Aeolian Tone using a pair of Splitter Plates

Abstract We propose here a novel arrangement consisting of a pair of splitter plates kept close to a circular cylinder to suppress aeolian tone. Splitter plates have a circular arc shape and are located concentrically close to the top and the bottom surfaces of the cylinder. Solutions for flow past a cylinder and splitter plates assembly have been obtained by solving unsteady, two-dimensional, compressible, Navier-Stokes equations using the direct numerical simulation (DNS) approach. Simulations have been performed for the free-stream Reynolds number of R e = 150 and the Mach number M = 0.2 . Shear layers separated from the splitter plates and the circular cylinder interact with each other. For certain positions of the splitter plates, considerable reductions in flow and sound disturbances have been noted. Maximum reduction in the net radiated sound power obtained by inserting splitter plates is around 21 dB as compared to the no-splitter plate case. Sound fields for such cases with significant reduction in the radiated sound, display the quadrupole behavior instead of the dipolar behavior which is usually observed for a laminar flow past a bluff body.