The model equations are the same as used by the DES variant of the model, with a different approximation for \( \tilde{d} \):
\[ \tilde{d} = \max \left[ L_{RAS} - f_d, \max (L_{RAS} - L_{LES}, 0) \right] \]
The RAS length scale is:
\[ L_{RAS} = y \]
and the LES length:
\[ L_{LES} = \Psi C_{DES} \Delta \]
The delay function is given by:
\[ f_d = 1 - \tanh \left[ \left( C_{d1} r_d \right)^{C_{d2}} \right] \]
Here, when \( f_d = 0 \) RAS is recovered, and when \( f_d = 1 \) the DES mode is recovered. The \( r_d \) parameter is given by:
\[ r_d = \min \left( \frac{\nu_{\mathit{eff}}}{\mag {\grad \u} \kappa^2 y^2}, 10\right) \]
The model is specified using:
LES { turbulence on; LESModel SpalartAllmarasDDES; }
Inlet
Outlet
Walls
Source code:
References:
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