Siegel, Michael and Caflisch, Russell E. and Howison, Sam (2004) Global existence, singular solutions, and ill-posedness for the Muskat problem. Communications on Pure and Applied Mathematics, LVII . pp. 1-38. (In Press)
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The Muskat, or Muskat--Leibenzon, problem describes the evolution of the interface between two immiscible fluids in a porous medium or Hele-Shaw cell under applied pressure gradients or fluid injection/extraction. In contrast to the Hele-Shaw problem (the one-phase version of the Muskat problem), there are few nontrivial exact solutions or analytic results for the Muskat problem. For the stable, forward Muskat problem, in which the higher viscosity fluid expands into the lower viscosity fluid, we show global in time existence for initial data that is a small perturbation of a flat interface. The initial data in this result may contain weak (e.g., curvature) singularities.
For the unstable, backward problem, in which the higher viscosity fluid contracts, we construct singular solutions that start off with smooth initial data, but develop a point of infinite curvature at finite time.
|Additional Information:||This is a preprint of an article accepted for publication in Communications on Pure and Applied Mathematics, Copyright 2004 Wiley Periodicals Inc.|
|Uncontrolled Keywords:||Muskat problem, Hele-Shaw problem, free boundary problem, blow-up, singularity formation|
|Subjects:||O - Z > Partial differential equations|
D - G > Fluid mechanics
|Research Groups:||Oxford Centre for Industrial and Applied Mathematics|
|Deposited By:||Sam Howison|
|Deposited On:||15 Jun 2004|
|Last Modified:||20 Jul 2009 14:18|
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