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Initial layer for the Homogenization of a Conservation Law with Vanishing Viscosity

Dalibard, Anne-Laure (2007), Initial layer for the Homogenization of a Conservation Law with Vanishing Viscosity, Archive for Rational Mechanics and Analysis, 185, 3, p. 515-543. http://dx.doi.org/10.1007/s00205-007-0063-7

Type
Article accepté pour publication ou publié
Date
2007
Journal name
Archive for Rational Mechanics and Analysis
Volume
185
Number
3
Publisher
Springer
Pages
515-543
Publication identifier
http://dx.doi.org/10.1007/s00205-007-0063-7
Metadata
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Author(s)
Dalibard, Anne-Laure
Abstract (EN)
We study the limit as ε → 0 of the solutions of the equation ∂tuε+divx[A(xε,uε)]−εΔxuε=0 . This problem has already been addressed in a previous article in the case of well-prepared initial data, i.e. when the microscopic profile of the solution is adapted to the medium at time t = 0. Here, we prove that when the initial data is not well prepared, there is an initial layer during which the solution adapts itself to match the profile dictated by the environment. The typical size of the initial layer is of order ε. The proof relies strongly on the parabolic form of the equation; in particular, no condition of nonlinearity on A is required.
Subjects / Keywords
initial data; initial layer

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