Several of the physics interfaces vary only by one or two default settings (see Table 2-4 and Table 2-5) in the Physical Model section, which are selected either from a check box or list. For the Single-Phase Flow branch, the Laminar Flow and Creeping Flow interfaces have the same Name (spf), and this is the same for two of the Two-Phase Flow interfaces. In the Porous Media Flow branch the Free and Porous Media Flow interface combines a Laminar Flow interface with a Brinkman Equations interface (see Table 2-6).