Journal
FLOW TURBULENCE AND COMBUSTION
Volume 88, Issue 3, Pages 431-449Publisher
SPRINGER
DOI: 10.1007/s10494-011-9378-4
Keywords
LES; Delayed detached eddy simulation; DDES; Improved delayed detached eddy simulation; IDDES; Wall modeling in LES; WMLES
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Funding
- EU
- European Community [ACP8-GA-2009-233710-ATAAC]
- ANSYS Inc.
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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-omega 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).
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