Abstract
In this paper, we discuss the convergence of a domain decomposition method for the solution of linear parabolic equations in their mixed formulations. The subdomain meshes need not be quasi‐uniform; they are composed of triangles or quadrilaterals that do not match at interfaces. For the ease of computation, this lack of continuity is compensated by a mortar technique based on piecewise constant (discontinuous) multipliers. It is shown that the method on triangles, parallelograms or slightly distorted parallelograms is convergent at the expense of a half‐order loss of accuracy compared with mortar methods based on piecewise linear multipliers.
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