In the Turbulence panel you can enable turbulence models appropriate for your simulation.
Enabling and Disabling Turbulence
In certain situations it can be useful to disable turbulence model at the beginning of simulation. This can be done using the Enable Turbulence Equations button and is usually used to stabilize simulation. Turbulence model can be enabled or disabled even while the simulation is still running.
You can select one of three approaches to turbulence modelling:
Laminar - no turbulence modeling is used, applicable for very low velocity flows
RANS - Reynolds-Averaged Navier-Stokes is most widely used modeling approach, which offers balance between accuracy and computational cost
LES - Large Eddy Simulation offers improved modelling of large turbulent structures but is very computationally intensive
When you select RANS turbulence modeling you will only have to define a Model .
Currently available models are:
\(k-\omega SST SAS\)
Available models will vary depending on the version of OpenFOAM you are using and the solver that is currently selected.
Most models require some constants to be specified. You can edit these constants by clicking the Expand button. Usually, you should not change the default values.
When you select LES modeling you will be able to specify:
Model - LES or DES model to use
Delta - method for determining cutoff length scale
Filter – if selected model requires, you can select type of the LES filter
Currently, available LES models:
\(k-\omega SST DDES\)
\(k-\omega SST IDDES\)
\(k-\omega SST DES\)
\(Dynamic k Equation\)
Delta Calculation Methods
Currently, available Delta calculation methods:
Cube Root Volume
Max Delta XYZ
For Dynamic k Equation model there are available Filter operators: