Turning waves and breakdown for incompressible flows

Details Turning waves and breakdown for incompressible flows Turning waves and breakdown for incompressible flows

2010-11-27

arxiv.org/abs/1011.5996v1

Mathematics

Analysis of PDEs

15 pages

Scientific paper

We consider the evolution of an interface generated between two immiscible incompressible and irrotational fluids. Specifically we study the Muskat and water wave problems. We show that starting with a family of initial data given by $(\al,f_0(\al))$, the interface reaches a regime in finite time in which is no longer a graph. Therefore there exists a time $t^*$ where the solution of the free boundary problem parameterized as $(\al,f(\al,t))$ blows-up: $\|\da f\|_{L^\infty}(t^*)=\infty$. In particular, for the Muskat problem, this result allows us to reach an unstable regime, for which the Rayleigh-Taylor condition changes sign and the solution breaks down.

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