Non-axisymmetric cavities collapsing after the impact of a high-speed round disk on a water surface

From the paper “Collapse of Non-axisymmetric Cavities,“ Oscar R. Enriquez, Ivo R. Peters, Stephan Gekle, Laura Schmidt, Michel Versluis , Devaraj van der Meer, and Detlef Lohse, from Physics of Fluids Group, University of Twente, The Netherlands, October 14, 2009. “A round disk with a harmonic disturbance impacts on a water surface and creates a non-axisymmetric cavity which collapses under the in uence of hydrostatic pressure. We use disks deformed with mode m=2 to m=6. Fo