Low-Reynolds-number aerodynamic performance of small sized air vehicles is an area of increasing interest. In this study,we investigate low-Reynolds-number flows past an SD7003 airfoil to understand substantial viscous features of laminar separation and transitional flow followed by the intractable behavior of reattachment.In order to satisfy the three-dimensional(3D)requirement of the code,a simple“3D wing”is constructed from a two-dimensional(2D)airfoil and only four grid points are used in the spanwise direction.A parametric study of quasi-2D LES on the low-Reynolds-number airfoil flows at Re=60000 is performed.Effects of grid resolution and sub-grid scale(SGS)models are investigated.Although three-dimensional effects cannot be accurately captured, the quasi-2D LES calculations do reveal some important flow characteristics such as leading edge laminar separation and vortex shedding from the primary laminar separation bubble on the low-Reynolds-number airfoil.
展开▼
