The Turbulent Flow, Realizable k-ε (spf) interface () is used for simulating single-phase flows at high Reynolds numbers. The physics interface is suitable for incompressible flows, weakly compressible flows, and compressible flows at low Mach numbers (typically less than 0.3).

The equations solved by the Turbulent Flow, Realizable k-ε interface are the Reynolds-averaged Navier–Stokes (RANS) equations for conservation of momentum and the continuity equation for conservation of mass. Turbulence effects are modeled using the realizable two-equation k-ε model. The flow near walls is modeled using wall functions.

The Turbulent Flow, Realizable k-ε interface can be used for stationary and time-dependent analyses. The main feature is Fluid Properties, which adds the RANS equations and the transport equations for k and ε, and provides an interface for defining the fluid material and its properties. When this physics interface is added, the following default nodes are also added in the Model Builder: Fluid Properties, and Initial Values.

Except where included below, see The Turbulent Flow, k-ε Interface for all the other settings.

For this physics interface the parameters are C2, A0, σk, σe, κv, and B.