Modifications are proposed of two recently developed hybrid CFD strategies, Delayed Detached Eddy Simulation (DDES) and DDES with Improved wallmodeling capability (IDDES). The modifications are aimed at fine-tuning of these approaches to the k-ω SST background RANS model. The first one includes recalibrated empirical constants in the shielding function of the SA-based DDES model which are shown to be suboptimal (not providing the needed level of elimination of the Model Stress Depletion (MSD)) for the SST-based DDES model. For the SST-IDDES variant, in addition to that, a simplification of the original SA-based formulation is proposed, which does not cause any visible degradation of the model performance. Both modifications are extensively tested on a range of attached and separated flows (developed channel, backward-facing step, periodic hills, wallmounted hump, and hydrofoil with trailing edge separation).

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Modi¦cations are proposed of two recently developed hybrid CFD (computational §uid dynamics) strategies, Delayed Detached Eddy Simulation (DDES), and DDES with Improved wall-modeling capability (IDDES). The modi¦cations are aimed at ¦ne-tuning of these approaches to the kω SST (shear stress transport) background RANS (Reynolds-averaged NavierStokes) model. The ¦rst one includes recalibrated empirical constants in the shielding function of the Spalart Allmaras (SA) based DDES which are shown to be suboptimal (not providing a needed level of elimination of the Model Stress Depletion (MSD)) for the SST-based DDES model. For the SST-IDDES variant, in addition to that, a simpli¦cation of the original SA-based formulation is proposed, which does not cause any visible degradation of the model performance. Both modi¦cations are extensively tested on a range of attached and separated §ows (developed channel, backward-facing step, periodic hills, wall-mounted hump, and hydrofoil with trailing edge separation).