1.0- 



0.5 



0.5 



-1.0 



sSo. 



CROSS FLOW OSCILLATIONS 



Y/D =0.50 



4? 



2 d 3 ftpfW" 



■ o'Qo'f 



REDUCED VELOCITY, V, 



f.D 



•rP 



Figure 2.4 The "drag" coefficient Q/, at the vibration frequency plotted against the reduced velocity 

 V^ for Y/D = 0.5. The data are from Sarpkaya (12) and were measured in water with uniform, 

 steady fluid motion past a cylinder oscillating normal to the flow. The coefficient Q;, was derived 

 from the total unsteady transverse force. Lock-on occurs near K, = 5. 



30 



