Oscillating flow about circular cylinders at low Keulegan-Carpenter numbers.
Yuen, Nathan Q.S.
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The in-line force and the resulting drag and inertia coefficients for smooth and rough circular cylinders immersed in a sinusoidally oscillating flow at low Keulegan- Carpenter numbers (K) have been determined experimentally and compared with those obtained theoretically by Stokes and Wang. In addition, flow visualization experiments were carried out with oscillating cylinders in a water table and the stability of the flow was investigated. The results have shown that for very low values of K, the flow about the cylinder is laminar, attached, and stable and the drag coefficient is nearly identical to that predicted theoretically. At a critical K, the flow becomes unstable to Taylor-Gortler vortices and the drag coefficient jumps to a higher value. Subsequently, the flow separates, becomes turbulent and results in a minimum drag coefficient. The subsequent increases in drag are attributed to vortex shedding. The inertia coefficient agrees with that obtained theoretically in the range where the flow in laminar.
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