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Homogenization of a nonstationary convection-diffusion equation in a thin rod and in a layer

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Abstract

The paper deals with the homogenization of a non-stationary convection-diffusion equation defined in a thin rod or in a layer with Dirichlet boundary condition. Under the assumption that the convection term is large, we describe the evolution of the solution’s profile and determine the rate of its decay. The main feature of our analysis is that we make no assumption on the support of the initial data which may touch the domain’s boundary. This requires the construction of boundary layer correctors in the homogenization process which, surprisingly, play a crucial role in the definition of the leading order term at the limit. Therefore we have to restrict our attention to simple geometries like a rod or a layer for which the definition of boundary layers is easy and explicit.

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Authors and Affiliations

  1. Ecole Polytechnique, Route de Saclay, 91128, Palaiseau Cedex, France

    G. Allaire

  2. Narvik University College, Postbox 385, 8505, Narvik, Norway

    I. Pankratova & A. Piatnitski

  3. Ecole Polytechnique, Route de Saclay, 91128, Palaiseau Cedex, France

    I. Pankratova

  4. Lebedev Physical Institute RAS, Leninski ave., 53, 119991, Moscow, Russia

    A. Piatnitski

Authors
  1. G. Allaire
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  2. I. Pankratova
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  3. A. Piatnitski
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Correspondence to G. Allaire.

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Allaire, G., Pankratova, I. & Piatnitski, A. Homogenization of a nonstationary convection-diffusion equation in a thin rod and in a layer. SeMA 58, 53–95 (2012). https://doi.org/10.1007/BF03322605

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