H. Elbouzid et S. Nicaise, REFINED MIXED FINITE-ELEMENT METHODS FOR THE STOKES PROBLEM, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 322(11), 1996, pp. 1075-1080
The solution to the Stokes system with Dirichlet boundary conditions i
n a polygon or a polyhedron belongs to suitable weighted Sobolev space
s. This regularity lends to optimal rates of convergence for some mixe
d finite element methods refined judiciously near the singular points.