On existence of a collapsed bubble with surface tension in viscous incompressible fluid

Abstract

We consider the one-phase free boundary problem for the incompressible Navier-Stokes equations in ${\mathbb{R}}^d$ ($d\ge 2$). The surface tension is taken into account. The initial domain, which is the outside of a bubble, is an exterior domain. We prove that there exists a bubble evolving by this free boundary problem which collapses in a finite time without blowing up of principal curvatures of its boundary. In other words, what is called a splash singularity is formed in a finite time. This type of result is also valid for a bounded initial domain. To construct such an example, we introduce the notion of a domain with $\delta$-wing which is a flat Riemannian manifold that is not embedded in ${\mathbb{R}}^d$, but it covers the $\delta$-neighborhood of the original domain whose boundary is self-intersected.

49 pages, 4 figures