Error estimates of effective boundary conditions for the heat equation with optimally aligned coatings

We are interested in the validity of effective boundary conditions for a heat equation on a coated body as the thickness of the coating shrinks to zero. The coating is optimally aligned in the sense that the normal vector in the coating is an eigenvector of the thermal tensor. If the heat equation s...

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Published inJournal of mathematical analysis and applications Vol. 543; no. 1; p. 128972
Main Authors Meng, Lixin, Zhou, Zhitong
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.03.2025
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Abstract We are interested in the validity of effective boundary conditions for a heat equation on a coated body as the thickness of the coating shrinks to zero. The coating is optimally aligned in the sense that the normal vector in the coating is an eigenvector of the thermal tensor. If the heat equation satisfies Neumann boundary condition on the outer boundary of the coating, Chen et al. (Arch. Ration. Mech. Anal. 206 (2012) 911-951) derived the complete list of effective boundary conditions satisfied by the limiting model. In this paper we provide explicit error estimates between the full model and the effective model. Moreover, our error estimates are independent of time, which shows that the maximal time interval in which the effective boundary conditions remain valid are infinite. The proof is based on H2 estimates for solutions of the full model, characterization of large time behaviors for solutions of the effective model, and interaction estimates between the two models.
AbstractList We are interested in the validity of effective boundary conditions for a heat equation on a coated body as the thickness of the coating shrinks to zero. The coating is optimally aligned in the sense that the normal vector in the coating is an eigenvector of the thermal tensor. If the heat equation satisfies Neumann boundary condition on the outer boundary of the coating, Chen et al. (Arch. Ration. Mech. Anal. 206 (2012) 911-951) derived the complete list of effective boundary conditions satisfied by the limiting model. In this paper we provide explicit error estimates between the full model and the effective model. Moreover, our error estimates are independent of time, which shows that the maximal time interval in which the effective boundary conditions remain valid are infinite. The proof is based on H2 estimates for solutions of the full model, characterization of large time behaviors for solutions of the effective model, and interaction estimates between the two models.
ArticleNumber 128972
Author Zhou, Zhitong
Meng, Lixin
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  givenname: Zhitong
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Issue 1
Keywords Eigenvalue
Error estimates
Heat equation
Effective boundary conditions
Optimally aligned coatings
Language English
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Snippet We are interested in the validity of effective boundary conditions for a heat equation on a coated body as the thickness of the coating shrinks to zero. The...
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StartPage 128972
SubjectTerms Effective boundary conditions
Eigenvalue
Error estimates
Heat equation
Optimally aligned coatings
Title Error estimates of effective boundary conditions for the heat equation with optimally aligned coatings
URI https://dx.doi.org/10.1016/j.jmaa.2024.128972
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