Figure 15:

(a) The vertical oscillation amplitude of point A at the flexible tail shown for a range of fluid viscosity ${\mu }^{\mathrm{f}}$ and inlet mean velocity $\bar{u}$ using case 2 of Table 1 as the default case with fixed values of ${\rho }_0^{\mathrm{s}}={10}^3\mathrm{kg}\cdot {\mathrm{m}}^{-3}$ and $G^{\mathrm{s}}=2\times {10}^6\mathrm{kg}\cdot {\mathrm{m}}^{-1}\cdot \mathrm{s}{ }^{-2}$. The vertical amplitude sizes are depicted as blue circles of different diameters. The amplitude of $3.41\times {10}^{-3}\mathrm{m}$ given for case 2 of Table 2 is shown in color red as a reference size for comparison. (b) The vertical displacement of point A at the flexible tail shown for a range of solid density ${\rho }^{\mathrm{s}}$ and shear modulus $G^{\mathrm{s}}$ using case 2 of Table 1 as the default case with fixed values of $\bar{u}=2\mathrm{m}\cdot \mathrm{s},{\rho }^{\mathrm{f}}={10}^3\mathrm{k}\mathrm{g}\cdot {\mathrm{m}}^{-3}$ and ${\mu }^{\mathrm{f}}=1\mathrm{k}\mathrm{g}\cdot {\mathrm{m}}^{-1}\cdot {\mathrm{s}}^{-1}$. As in panel (a), the amplitude of $3.41\times {10}^{-3}\mathrm{m}$ corresponding to case 2 of Table 2 (shown in color red) is used as a reference size for comparison. The ($\left.{\mu }^f,\bar{u}\right)$ pairs shown by “✕” correspond to cases for which no apparent oscillations are observed.