ON THE DIFFUSIVE LIMITS OF RADIATIVE HEAT TRANSFER SYSTEM I: WELL-PREPARED INITIAL AND BOUNDARY CONDITIONS

Mohamed Ghattassi, Xiaokai Huo, Nader Masmoudi

Research output: Contribution to journalArticlepeer-review

Abstract

We study the diffusive limit approximation for a nonlinear radiative heat transfer system that arises in the modeling of glass cooling and greenhouse effects and in astrophysics. The model is considered with the reflective radiative boundary conditions for the radiative intensity and with periodic, Dirichlet and Robin boundary conditions for the temperature. The global existence of weak solutions for this system is given by using a Galerkin method with a careful treatment of the boundary conditions. Using the compactness method, averaging lemma and Young measure theory, we prove our main result that the weak solution converges to a nonlinear diffusion model in the diffusive limit. Moreover, under more regularity conditions on the limit system, the diffusive limit is also analyzed by using a relative entropy method. In particular, we get a rate of convergence. The initial and boundary conditions are assumed to be well-prepared in the sense that no initial or boundary layer exists.

Original languageEnglish (US)
Pages (from-to)5335-5387
Number of pages53
JournalSIAM Journal on Mathematical Analysis
Volume54
Issue number5
DOIs
StatePublished - 2022

Keywords

  • averaging lemma
  • compactness method
  • radiative transfer system
  • relative entropy
  • Young measures

ASJC Scopus subject areas

  • Analysis
  • Computational Mathematics
  • Applied Mathematics

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