Time-independent hybrid enrichment for finite element solution of transient conduction–radiation in diffusive grey media

M Shadi Mohamed, Mohammed Seaid, Jon Trevelyan, Omar Laghrouche

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    16 Citations (Scopus)
    104 Downloads (Pure)

    Abstract

    We investigate the effectiveness of the partition-of-unity finite element method for transient conduction–radiation problems in diffusive grey media. The governing equations consist of a semi-linear transient heat equation for the temperature ?eld and a stationary diffusion approximation to the radiation in grey media. The coupled equations are integrated in time using a semi-implicit method in the finite element framework. We show that for the considered problems, a combination of hyperbolic and exponential enrichment functions based on an approximation of the boundary layer leads to improved accuracy compared to the conventional finite element method. It is illustrated that this approach can be more effcient than using h adaptivity to increase the accuracy of the finite element method near the boundary walls. The performance of the proposed partition-of-unity method is analyzed on several test examples for transient conduction–radiation problems in two space dimensions.
    Original languageEnglish
    Pages (from-to)81–101
    Number of pages21
    JournalJournal of Computational Physics
    Volume251
    DOIs
    Publication statusPublished - 15 Oct 2013

    Keywords

    • Finite-element method
    • Partition-of-unity method
    • Transient conduction–radiation problems
    • Simplified P1 approximation
    • Radiative heat transfer

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