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Development of DDES and IDDES Formulations for the k-ω Shear Stress Transport Model
Ist Teil von
Flow, turbulence and combustion, 2012-04, Vol.88 (3), p.431-449
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Springer Nature - Complete Springer Journals
Beschreibungen/Notizen
Modifications are proposed of two recently developed hybrid CFD strategies, Delayed Detached Eddy Simulation (DDES) and DDES with Improved wall-modeling 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, wall-mounted hump, and hydrofoil with trailing edge separation).