Detached Eddy Simulation relates to a hybrid RAS-LES approach to turbulence modelling, aiming to alleviate the costly near-wall meshing requirements imposed by LES.

Options🔗

• Spalart-Allmaras Delayed Detached Eddy Simulation (DDES)
• Spalart-Allmaras Detached Eddy Simulation (DES)
• Spalart-Allmaras Improved Delayed Detached Eddy Simulation (IDDES)
• k-ω-SST Delayed Detached Eddy Simulation (DDES)
• k-ω-SST Detached Eddy Simulation (DES)
• k-ω-SST Improved Delayed Detached Eddy Simulation (IDDES)

Usage🔗

DES is implemented as a subset of LES, selected by setting the simulationType entry

simulationType  LES;

LES
{
    \\ Model input parameters
}

Suitable for:

• 3-D cases, not appropriate for reduced-dimension cases
• transient, not appropriate for steady state

Initialisation🔗

Typically initialised from a precursor calculation, e.g. employing RAS modelling.

Wall modelling🔗

• Wall functions

Further information🔗

Source code:

• $FOAM_SRC/TurbulenceModels/turbulenceModels/DES

Related:

• Source documentation