Figure 2
Response characteristics of the system with \(U_r\): (a) maximum non-dimensional oscillation amplitude (\(y_{{\textrm{max}}}\)) of the cylinder, (b) mean in-line force coefficient \(C_{x,{{\textrm{mean}}}}\), (c) root-mean-square cross-flow force coefficient \(C_{y,{{\textrm{rms}}}}\), and (d) dominant frequency with respect to cylinder natural frequency \(f/f_{n,y}\). For the NRGP cases, \({\overline{m}} = 0.3\), \(l_d = 0.1\), \(\omega _r = 1.3\) and \(\zeta _\theta = 0.0011\).
