The basic problem that Ansys Polyflow must solve at a given time step or iteration is a linear algebraic system of the following form:

(31–1)

The matrix is typically large, sparse, and asymmetric.

Ansys Polyflow provides a variety of solvers; some are pure direct solvers, while others combine direct and iterative techniques. You can select the solver through the Numerical parameters menu of the F.E.M. Task. In the Numerical parameters menu, click Modify numerical parameters for iterations to access the Numerical parameters for iterations menu. Here, you can select the Modify the solver aggressivity item and select one of the available solvers, which are described in the sections that follow.