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A typical application would be the modelling of flow in a porous medium containing a number of inclusions of low (or high) permeability embedded in a matrix of high (respectively low) permeability. Our method is H 1 H^1 - conforming, with degrees of freedom at the nodes of a triangular mesh and requiring the solution of subgrid problems for the basis functions on elements which straddle the coefficient interface but which use standard linear approximation otherwise. A key point is the introduction of novel coefficient-dependent boundary conditions for the subgrid problems. Under moderate assumptions, we prove that our methods have (optimal) convergence rate of O ( h ) O(h) in the energy norm and O ( h 2 ) O(h^2) in the L 2 L_2 norm where h h is the (coarse) mesh diameter and the hidden constants in these estimates are independent of the “contrast” (i.e. ratio of largest to smallest value) of the PDE coefficient. For standard elements the best estimate in the energy norm would be O ( h 1 / 2 − ε ) \\mathcal {O}(h^{1/2-\\varepsilon }) with a hidden constant which in general depends on the contrast. 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C.-C. Chu 人物

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