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A priori estimates for the solution of convection-diffusion problems and interpolation on Shishkin meshes. (English) Zbl 0892.35014
Summary: The solution of singularly perturbed convection-diffusion problems can be split into a regular and a singular part containing the boundary layer terms. In dimensions $$n=1$$ and $$n=2$$, sharp estimates of the derivatives of both parts up to order 2 are given. The results are applied to estimate the interpolation error for the solution on Shishkin meshes for piecewise bilinear finite elements on rectangles and piecewise linear elements on triangles. Using the anisotropic interpolation theory it is proved that the interpolation problem on Shishkin meshes is quasi-optimal in $$L_\infty$$ and in the energy norm.

##### MSC:
 35B25 Singular perturbations in context of PDEs 35B40 Asymptotic behavior of solutions to PDEs 65D05 Numerical interpolation 65N15 Error bounds for boundary value problems involving PDEs 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 35J25 Boundary value problems for second-order elliptic equations
##### Keywords:
boundary layer terms; anisotropic interpolation theory
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##### References:
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