Abstract
In fluid dynamics, an interface splash singularity occurs when a locally smooth interface self-intersects in finite time. By means of elementary arguments, we prove that such a singularity cannot occur in finite time for vortex sheet evolution, that is for the two-phase incompressible Euler equations. We prove this by contradiction; we assume that a splash singularity does indeed occur in finite time. Based on this assumption, we find precise blow-up rates for the components of the velocity gradient which, in turn, allow us to characterize the geometry of the evolving interface just prior to self-intersection. The constraints on the geometry then lead to an impossible outcome, showing that our assumption of a finite-time splash singularity was false.
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Coutand, D., Shkoller, S. On the Impossibility of Finite-Time Splash Singularities for Vortex Sheets. Arch Rational Mech Anal 221, 987–1033 (2016). https://doi.org/10.1007/s00205-016-0977-z
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DOI: https://doi.org/10.1007/s00205-016-0977-z