An embedded--hybridized discontinuous Galerkin method for the coupled Stokes--Darcy system

05/23/2019

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by   Aycil Cesmelioglu, et al.

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University of Waterloo

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University of Cambridge

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Oakland University

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We introduce an embedded--hybridized discontinuous Galerkin (EDG--HDG) method for the coupled Stokes--Darcy system. This EDG--HDG method is a pointwise mass-conserving discretization resulting in a divergence-conforming velocity field on the whole domain. In the proposed scheme, coupling between the Stokes and Darcy domains is achieved naturally through the EDG--HDG facet variables. A priori error analysis shows optimal convergence rates, and that the velocity error does not depend on the pressure. The error analysis is verified through numerical examples on unstructured grids for different orders of polynomial approximation.