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) equation 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 equation 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-e Interface for all the other settings.

A different turbulence model of RANS-EVM type can be selected under Turbulence model. Changing the Turbulence model type to RANS-RSM, a turbulence model of RANS-RSM type can be selected under Turbulence model. Laminar or creeping flow may be simulated by changing the Turbulence model type to None.

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