In FEM, which option is a negative aspect of the mixed formulation?
(a) Presence of zeros on matrix diagonals corresponding to pressure variable
(b) Involves a natural and direct formulation
(c) It is a velocity-pressure formulation
(d) It is similar to the Lagrange multiplier method
The question was posed to me in semester exam.
This is a very interesting question from Penalty topic in section Flows of Viscous Incompressible Fluids of Finite Element Method