Abstract
A two-dimensional simulation of the laminar flow past a circular cylinder is investigated, in this study. To control the boundary layer growth, a pair of moving surfaces with streamwise (positive) motion is mounted on different locations of the upper and lower surfaces of the cylinder. The effects of the surface locations on the power and drag coefficients and the vortex shedding state are studied at several moving surface speeds. The Reynolds number based on the cylinder diameter is varied between 60 and 180. The flow simulation is performed by a solution of the unsteady Navier-Stokes equations using a pressure-velocity coupling method. To integrate the momentum equations, a four-stage Runge–Kutta scheme with second-order accuracy in time and space is used. Some results are compared with previous experimental and numerical data. The results from this study indicate that the moving surfaces can eliminate the vortex shedding so that the flow achieves a steady state for the above-mentioned range of Reynolds number. It is also found that some of these surfaces reduce the drag coefficient and the total power requirements of the system motion. Moreover, the optimum location and the speed of the surfaces corresponding to the minimum power coefficient are obtained.
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