Enable Direct Solver

The direct solver provides a multi-frontal (MF) approach when a matrix is not 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 the Enable Direct Solver option, HFSS automatically invokes the multi-frontal solver. If you select Iterative Solver and HFSS decides that the matrix is not conditioned well enough to take advantage of the iterative approach HFSS still uses the multi-frontal solver.

Enable the Direct Solver

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