ERROR ESTIMATES FOR BARYCENTRIC FINITE VOLUMES COMBINED WITH NONCONFORMING FINITE ELEMENTS APPLIED TO NONLINEAR CONVECTION-DIFFUSION PROBLEMS*


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Abstract

The subject of the paper is the derivation of error estimates for the combined finite volume-finite element method used for the numerical solution of nonstationary nonlinear convection-diffusion problems. Here we analyze the combination of barycentric finite volumes associated with sides of triangulation with the piecewise linear nonconforming Crouzeix-Raviart finite elements. Under some assumptions on the regularity of the exact solution, theL2(L2) and L2(H2) error estimates are established. At the end of the paper, some computational results are presented demonstrating the application of the method to the solution of viscous gas flow.

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