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SeMA Journal

, Volume 58, Issue 1, pp 53–95 | Cite as

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

  • G. Allaire
  • I. Pankratova
  • A. Piatnitski
Article
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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.

Key words

Homogenization convection-diffusion localization thin cylinder layer 

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Copyright information

© Sociedad Española de Matemática Aplicada 2012

Authors and Affiliations

  1. 1.Ecole PolytechniquePalaiseau CedexFrance
  2. 2.Narvik University CollegeNarvikNorway
  3. 3.Ecole PolytechniquePalaiseau CedexFrance
  4. 4.Lebedev Physical Institute RASMoscowRussia

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