Problem with iterative solver for mixed FEM problem
Problem is formulated as mixed problem because of real and imaginary part of solution (electromagnetic field in frequency domain).
While using standard solver everything seems fine but iterative solver refuse to converge. I'm using gmres because system is not symmetric and ilu preconditioner.
solver = KrylovSolver('gmres', 'ilu') prm = solver.parameters prm.absolute_tolerance = 1E-7 prm.relative_tolerance = 1E-4 prm.maximum_iterations = 100000
After a couple of iterations (6, 7) process is killed. It works normally on non-mixed problems.
Using other combinations result in maximal number of iterations without convergence. Relative error is always around 10^-1. Which combination can be used for iterative solving of the linear system arising in mixed problems?