"Kelvin\u2013Helmholtz instabilities" . "Kelvin\u2013Helmholtz instability" . . . "Kelvin\u2013Helmholtz vortices" . . . "Helmholtz instability" . "Kelvin\u2013Helmholtz waves" . "Kelvin\u2013Helmholtz instability" . . . . . . . . . . . . . . "Kelvin-Helmholtz" . . "instability" . . "Kelvin\u2013Helmholtz (K\u2013H) instability" . . .