A divergence-free mixed FEM for Stokes using H(div) velocities and tangential-normal continuous traceless tensor stresses achieves optimal stress errors and superconvergent velocity-pressure rates via a proved distributional divergence-free property.
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Superconvergent and Divergence-Free Mixed Finite Element Methods for The Stokes Equation
A divergence-free mixed FEM for Stokes using H(div) velocities and tangential-normal continuous traceless tensor stresses achieves optimal stress errors and superconvergent velocity-pressure rates via a proved distributional divergence-free property.