Abstract
We investigate regularity and well-posedness for a fluid evolution model in the presence of a three-phase contact point. We consider a fluid evolution governed by Darcy’s Law. After linearization, we obtain a nonlocal third order operator which contains the Dirichlet-Neumann operator on the wedge with opening angle \({\epsilon > 0}\) . We show well-posedness and regularity for this linear evolution equation. In the limit of vanishing opening angle, we show the convergence of solutions to a fourth order degenerate parabolic operator, related to the thin-film equation. In the course of the analysis, we introduce and characterize a new type of sum of weighted Sobolev spaces which are suitable to capture the singular limit as \({\epsilon \to 0}\) . In particular, the nature of the problem requires the use of techniques that are adapted to the problem in the singular domain as well as the degenerate limit problem.
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Communicated by P. Constantin
N. M was partially supported by an NSF Grant DMS-1211806.
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Knüpfer, H., Masmoudi, N. Well-Posedness and Uniform Bounds for a Nonlocal Third Order Evolution Operator on an Infinite Wedge. Commun. Math. Phys. 320, 395–424 (2013). https://doi.org/10.1007/s00220-013-1708-z
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DOI: https://doi.org/10.1007/s00220-013-1708-z