The performance of a dynamic linear unified RANS-LES model (DLUM) is investigated for separated flows at high Reynolds number. In particular, a periodic hill flow is simulated at a Reynolds number of 37,000. The performance of the DLUM is compared with pure LES. It is found that the DLUM performs much better than pure LES on coarse and even fine grids. The DLUM has an excellent performance regarding the prediction of the complicated flow features including the separation bubble and reattachment points. The DLUM has significant advantages compared to LES with respect to predicting the profiles of mean velocities and turbulent shear stresses. We also performed a cost analysis for LES and DLUM for separated flows. We found that the use of the DLUM is related to a significant computational cost reduction by factor of Re/200.
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