o 



0.25 



INCIDENT FLOW 



0.20 - 



CD SMOOTH 



O GRID TURBULENCE 



A SHALLOW BOUNDARY LAYER 



O MEDIUM BOUNDARY LAYER 



0.10- 



0.05 



5 10 



REDUCED VELOCITY, V^ =V/fn D 



Figure 2.14 Peak cross flow displacement amplitude YID (root-mean-square of Y) plotted against reduced 

 velocity V, for a flexibly-mounted circular cylinder in uniform and sheared incidents flows; from Howell and 

 Novak (20). Structural damping ratio i, = 0.01; aspect ratio LID = 10. The various types of incident wind 

 flows are given by the legend. The figure was provided by Dr. John F. Howell, University of Bath, England. 



39 



