Studies of processes arising in the case of the impact of a droplet falling vertically onto a quiescent water surface, which began in the nineteenth century [1], nowadays, as previously, attract attention of scientists, both theoreticians and experimentalists [2]. This is associated with the importance of these processes for practical applications and the complexity of the mathematical description of relevant flows. Among the most interesting phenomena accompanying these processes, we can indicate the evolution of the shape of the arising cavern, as well as the splash and the cascade of vortices propagating into the bulk of the liquid. The objects of the studies are rapid processes (formation of a cavern or of a splash and droplets ejected by basic liquid), which are illustrated well by the monographs [3, 4]. However, slow process (e.g., droplet transformation to the vortex ring [1] and the cascadevortex generation [5]) are also extremely interesting.
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