68 / 2019-09-28 11:13:13

ILES of tip leakage vortex flows with Nektar++

ILES,TBL,tip vortex,Nektar++

The tip-clearance flow and the rollup process of a tip leakage vortex (TLV) has been studied for decades. However, there are still many phenomena that cannot be explained. In this article, a high-fidelity discretization scheme and an implicit large-eddy simulation has been performed to analyze the near-field flow characteristics and evolution of a tip leakage vortex. First, an overview of spectral element method and implicit large-eddy simulations is given. In order to demonstrate the feasibility of these methods, two 2D cases over a NACA0015 profile wingtip at Rec=1.2×105 and a flat-plate boundary layer are compared with the experimental data in literature. Investigations on the influence of the clearance size on the tip vortex structure has been carried out. The interactions between tip vortex and wall boundary, propagation of the vortex core in the near wake and the whole 3D velocity fields will be reported in the conference.