The Turbulent Flow, v2-f (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).

Except where included below, see The Laminar Flow Interface and 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.

The Turbulence model property disables the Neglect inertial term (Stokes flow) checkbox, and for 2D components also the Shallow Channel Approximation checkbox.

The v2-f model employs per default an Automatic wall treatment, which switches between a low-Reynolds-number formulation and a wall function formulation depending on how well resolved the flow is close to the wall. The automatic wall treatment gives a robust formulation that makes the most out of the available resolution.

Select the Low Re option in order to enforce resolution all the way down to the wall. This can be more accurate than the automatic wall treatment provided that the mesh is fine enough.

For this physics interface the parameters are Cμv2f, Cτ, Cη, CL, C1, C2, Cε1v2f, Cε2v2f, A1, σkv2f, σεv2f, σζv2f, κv, and B.

For study information, see Stationary with Initialization, Time Dependent with Initialization, and Wall Distance Initialization in the COMSOL Multiphysics Reference Manual.