A deflated preconditioned conjugate gradient solver for Electro-Quasistatic finite element simulations

The occurrence of materials with large differences in permittivity and conductivity has negative impact to the convergence to the preconditioned conjugate gradient solver used as a linear system solver in an implicit time integrator to solve Electro-Quasistatic Problems. Combining the preconditioned Conjugate Gradient method with a deflation technique can converging faster compared to an Incomplete Cholesky Conjugate Gradient method.