Experimental Study on the Wake Characteristics of Composite Secondary Grooved Cylinder

Flow around cylinders is widespread in marine engineering projects such as risers, pipelines, and tension leg. To understand the wake characteristics of circular cylinder with different roughness, at a Reynolds number 7400, circulation water tunnel used for experimental PIV measurements to compare among smooth cylinder, original grooved secondary cylinder. The results revealed that reduced recirculation region, flow-direction velocity gradient, shear stresses, turbulent kinetic energy. Both small-scale large-scale vortices are present vortex shedding. instantaneous behind dispersed into several relatively vortices. Furthermore, spike generator, directly impacts generation small eddies dissipation large