Summary
New finite element methods based on Cartesian triangulations are presented for two dimensional elliptic interface problems involving discontinuities in the coefficients. The triangulations in these methods do not need to fit the interfaces. The basis functions in these methods are constructed to satisfy the interface jump conditions either exactly or approximately. Both non-conforming and conforming finite element spaces are considered. Corresponding interpolation functions are proved to be second order accurate in the maximum norm. The conforming finite element method has been shown to be convergent. With Cartesian triangulations, these new methods can be used as finite difference methods. Numerical examples are provided to support the methods and the theoretical analysis.
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Mathematics Subject Classification (2000): 65L10, 65L60, 65L70
In this research, Zhilin Li is supported in part by USA ARO grants, 39676-MA and 43751-MA, USA NSF grants DMS-0073403 and DMS-0201094; USA North Carolina State University FR&PD grant; Tao Lin is supported in part a USA NSF grant DMS-97-04621. Special thanks to Thomas Hou for his participation and contribution to this project. We are also grateful to R. LeVeque, K. Bube, and T. Chan for useful discussions.
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Li, Z., Lin, T. & Wu, X. New Cartesian grid methods for interface problems using the finite element formulation. Numer. Math. 96, 61–98 (2003). https://doi.org/10.1007/s00211-003-0473-x
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DOI: https://doi.org/10.1007/s00211-003-0473-x