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In FEM, which option is a negative aspect of the mixed formulation?

In FEM, which option is a negative aspect of the mixed formulation? Correct Answer Presence of zeros on matrix diagonals corresponding to pressure variable

A negative aspect of the mixed finite element model is the presence of zeroes on the matrix diagonals corresponding to the pressure variables. Direct equation-solving methods must use some type of pivoting strategy, while the use of iterative solvers is severely handicapped by poor convergence behavior.

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