A set of simulations has been conducted on the 30P30N high-lift three-element airfoil using a hybrid Reynolds-averaged Navier?Stokes-large-eddy simulation (RANS?LES) method on multiblock structured and Cartesian-prismatic unstructured grids. These simulations using the SST-IDDES (improved delayed detached-eddy simulation) model have been shown to agree well with previous experimental and numerical investigations in terms of mean quantities, as well as spectra and flow structures. It has also been shown that results from a Cartesian-prismatic unstructured mesh generated in only a few days were able to predict both mean and instantaneous flow features to an acceptable level. However, there were clearly areas where improvements to the mesh, numerical scheme, and turbulence model could improve the correlation to both the experimental data and the multiblock structured mesh. It was demonstrated from the grids used in this study that IDDES exhibited a sensitivity to the near-wall meshing.
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Ashton et al. (2016) studied this question.
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