Geodesic
On the global existence for the Muskat problem
Journal of the European Mathematical Society, Tome 15 (2013) no. 1, pp. 201-227.

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The Muskat problem models the dynamics of the interface between two incompressible immiscible fluids with different constant densities. In this work we prove three results. First we prove an L2(R) maximum principle, in the form of a new "log'' conservation law which is satisfied by the equation (1) for the interface. Our second result is a proof of global existence for unique strong solutions if the initial data is smaller than an explicitly computable constant, for instance ∥f∥1​≤1/5. Previous results of this sort used a small constant ε≪1 which was not explicit. Lastly, we prove a global existence result for Lipschitz continuous solutions with initial data that satisfy ∥f0​∥L∞​∞ and ∥∂x​f0​∥L∞​1. We take advantage of the fact that the bound ∥∂x​f0​∥L∞​1 is propagated by solutions, which grants strong compactness properties in comparison to the log conservation law.
DOI : 10.4171/jems/360
Classification : 35-XX, 76-XX, 00-XX
Mots-clés : Porous media, incompressible flows, fluid interface, global existence 
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Peter Constantin; Diego Córdoba; Francisco Gancedo; Robert M. Strain. On the global existence for the Muskat problem. Journal of the European Mathematical Society, Tome 15 (2013) no. 1, pp. 201-227. doi : 10.4171/jems/360. https://geodesic-test.mathdoc.fr/articles/10.4171/jems/360/

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