THE EFFECT OF ROTATION RATES, CYLINDER DIAMETER AND LATERAL BOUNDARIES ON STROUHAL NUMBER IN UNSTEADY REGIMES AT DIFFERENT REYNOLDS NUMBERS

The lateral boundary conditions, rotation rates parameters, domain size, cylinder diameter, and Reynolds number are all responsible for the variation of the Strouhal number. In this study, we have varied the domain size, lateral boundary conditions, downstream locations, and the cylinder diameter at specific values of Reynolds number for stationary and rotating cylinders in order to spot the difference in each case. The effect of the rotating cylinder on the flow behavior downstream leads to a variation of Strouhal number. Thus, we have rotated the circular cylinder clockwise and counter-clockwise in order to visualize its effect on the Strouhal number values. An unsteady study was developed for laminar and turbulent regimes from 𝑅𝑒=60 to 𝑅𝑒=3900.