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A Symmetric and Consistent Immersed Finite Element Method for Interface Problems

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Abstract

The non-conforming immersed finite element method (IFEM) developed in Li et al. (Numer Math 96:61–98, 2003) for interface problems is extensively studied in this paper. The non-conforming IFEM is very much like the standard finite element method but with modified basis functions that enforce the natural jump conditions on interface elements. While the non-conforming IFEM is simple and has reasonable accuracy, it is not fully second order accurate due to the discontinuities of the modified basis functions. While the conforming IFEM also developed in Li et al. (Numer Math 96:61–98, 2003) is fully second order accurate, the implementation is more complicated. A new symmetric and consistent IFEM has been developed in this paper. The new method maintains the advantages of the non-conforming IFEM by using the same basis functions but it is symmetric, consistent, and more important, it is second order accurate. The idea is to add some correction terms to the weak form to take into account of the discontinuities in the basis functions. Optimal error estimates are derived for the new symmetric and consistent IFE method in the \(L^2\) and \(H^1\) norms. Numerical examples presented in this paper confirm the theoretical analysis and show that the new developed IFE method has \(O(h^2)\) convergence in the \(L^\infty \) norm as well.

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Acknowledgments

The authors would like to thank the anonymous referee for constructive comments. The first and second authors were supported by the National Science Foundation (NSF) of China (Grants Nos. 11371199 and 11301275), the Program of Natural Science Research of Jiangsu Higher Education Institutions of China (Grant No. 12KJB110013), and the Doctoral fund of Ministry of Education of China (Grant No. 20123207120001), and the Innovation Project for Graduate Education of Jiangsu Province (CXLX13_365). The third author was partially supported by the US ARO grants 550694-MA, the AFSOR grant FA9550-09-1-0520, the US NSF grant DMS-0911434, and the NIH grant 096195-01, and CNSF grants 11071123 and 11161036.

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Authors and Affiliations

  1. Jiangsu Key Laboratory for NSLSCS, School of Mathematical Sciences, Nanjing Normal University, Nanjing , 210023, China

    Haifeng Ji & Jinru Chen

  2. Department of Mathematics, North Carolina State University, Raleigh, NC , 27695, USA

    Zhilin Li

  3. Nanjing Normal University, Nanjing , 210023, China

    Zhilin Li

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  1. Haifeng Ji
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  2. Jinru Chen
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Correspondence to Jinru Chen.

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Ji, H., Chen, J. & Li, Z. A Symmetric and Consistent Immersed Finite Element Method for Interface Problems. J Sci Comput 61, 533–557 (2014). https://doi.org/10.1007/s10915-014-9837-x

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  • DOI: https://doi.org/10.1007/s10915-014-9837-x

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