The Turbulent Flow, L-VEL (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 number (typically less than 0.3).
With the addition of various modules, the Enable porous media domains check box is available. Selecting this option, a
Fluid and Matrix Properties node, a
Mass Source node, and a
Forchheimer Drag subnode are added to the physics interface. These are described for the
Brinkman Equations interface in the respective module’s documentation. Applying the
Fluid and Matrix Properties on a subset of the domains enables studies of coupled porous-media flow and turbulent flow.
A different turbulence model can be selected under Turbulence model.
Laminar or creeping flow may simulated by changing the
Turbulence model type to
None.
L-VEL 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.
Turbulence model parameters, κl and
El, have been optimized for internal flow. For certain cases, better performance can be obtained by tuning the model parameters. The turbulence model parameters can be tuned when the
Edit turbulence model parameters check box is selected.