Volume 5, Juin 2013Progress in Flight Physics
|Page(s)||23 - 42|
|Section||Chapter One. Turbulence modeling|
|Published online||14 June 2013|
Fine-tuning of DDES and IDDES formulations to the k-ω shear stress transport model
St. Petersburg State Polytechnical University St. Petersburg 195251, Russia
2 Software Development Department, ANSYS Otterfing 83714, Germany
Modifications are proposed of two recently developed hybrid CFD (computational fluid dynamics) 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 (shear stress transport) background RANS (Reynolds-averaged Navier-Stokes) model. The first 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 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).
© Owned by the authors, published by EDP Sciences, 2013
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