Spalart-Allmaras Improved Delayed Detached Eddy Simulation (IDDES)

Table of Contents

• Properties
• Model equations
• Default model coefficients
• Initialisation
• Usage
• Boundary conditions
• Further information

Note

Under construction - please check again later

Properties

• One equation model based on a modified turbulence viscosity, \( \tilde{\nu} \)

Model equations

The model equations are the same as used by the DES variant of the model, with a different approximation for \( \tilde{d} \):

\[ \tilde{d} = \max \left( \tilde{f_d} (1 + f_e) L_{RAS} + (1 - \tilde{f_d}) L_{LES}, SMALL \right) \]

Default model coefficients

Initialisation

Usage

The model is specified using:

LES
{
    turbulence      on;
    LESModel        SpalartAllmarasIDDES;
}

Boundary conditions

Inlet

• Fixed value

Outlet

• Constrained outlet

Walls

• wall functions

Further information

Source code:

• Foam::LESModels::spalartAllmarasIDDES

References:

• Gritskevich et al. [23]

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