کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
768595 | 1462725 | 2013 | 9 صفحه PDF | دانلود رایگان |
This paper investigates the capability of large-eddy simulation (LES) with wall-modeling in predicting transitional and separated flow over an airfoil near stall condition at high Reynolds number (chord based Rec = 2.1 × 106). By incorporating the non-equilibrium effects and transition treatment in the wall model, the wall-modeled LES well predicts the mean and turbulence statistics in the region of laminar separation, turbulent transition, turbulent reattachment, and initial-mid developments of attached turbulent boundary layer. The present LES with non-equilibrium wall-model reproduces the dynamics of two-dimensional intermittent laminar separation vortices, hairpin-like vortices, and breakdown of the laminar separation vortices to three-dimensional turbulent structures that allow the boundary layer to reattach. Comparisons between the non-equilibrium and equilibrium wall-models highlight the importance of including the non-equilibrium effects in the model.
Journal: Computers & Fluids - Volume 85, 1 October 2013, Pages 105–113