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Experimental study of forces on a cylinder in oscillatory flow with a cross current |
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| Authors: | PK Stansby N El-Khairy GN Bullock |
| Institution: | Simon Engineering Laboratories, University of Manchester, Oxford Road, Manchester M13 9PL, England Department of Civil Engineering, University of Salford, Salford M5 4WT, England |
| Abstract: | Forces on a circular cylinder have been measured with nominally two-dimensional current and oscillatory flow at right angles. Previous results for purely oscillatory flow defined by a Keulegan-Carpenter number, Kc, have been extended for reduced velocities, Vr, in the range 3–10. For Kc<7 modification of the Karman street by oscillation is complex and locking-on has a dominant influence. For Kc > 7 simply adding forces due to the current and oscillation as though in isolation generally gives conservative results. The ‘current’ drag shows considerable variation and can even be negative. The Morison fit to the in-line force is generally less satisfactory when there is a current and can be wholly inadequate. |
| Keywords: | Flow cylinder force current oscillation |
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