Enable Iterative Solver

The iterative solver provides an alternative to the multi-frontal solver when a matrix is well-conditioned for an iterative solution. The iterative solver significantly reduces memory usage, and it can also provide a savings in the solution time for large simulations.

When you select Enable Iterative Solver, HFSS automatically invokes the iterative solver when it decides that the matrix is conditioned well enough to take advantage of the iterative approach. HFSS uses the multi-frontal solver if the matrix does not meet this requirement.

For more detail, see the technical notes for Iterative Matrix Solver.

Enable the Iterative Solver

From the Solution Setup window, select the Options tab. Then select Iterative Solver from the Solution Options group box.

This enables the Relative Residual check box. The residual measures the convergence of the iterative solver. Check the box, if desired, and enter a Relative Residual value in the adjacent text field (default value is 1E-6).