Mixed Finite Element Methods on Nonmatching Multiblock Grids

  title={Mixed Finite Element Methods on Nonmatching Multiblock Grids},
  author={Todd Arbogast and Lawrence C. Cowsar and Mary F. Wheeler and Ivan Yotov},
  journal={SIAM J. Numerical Analysis},
We consider mixed finite element methods for second order elliptic equations on nonmatching multiblock grids. A mortar finite element space is introduced on the nonmatching interfaces. We approximate in this mortar space the trace of the solution, and we impose weakly a continuity of flux condition. A standard mixed finite element method is used within the blocks. Optimal order convergence is shown for both the solution and its flux. Moreover, at certain discrete points, superconvergence is… CONTINUE READING


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