Block preconditioner with velocity-pressure Schur approximation yields mesh-independent GMRES convergence for SBM-Stokes via field-of-values analysis showing non-symmetric terms are small perturbations on fine meshes.
Numerical Linear Algebra with Applications , volume =
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Strong enforcement of symmetry in H(div)-conforming finite elements yields material-robust stress approximations independent of the constitutive law, whereas weak enforcement produces arbitrarily poor results even in zero-stress cases with anisotropic laws.