DETACHED-EDDY SIMULATION: CURRENT STATUS AND PERSPECTIVES

摘要

Detached-Eddy Simulation (DES) is a hybrid technique proposed in 1997 as a numerically feasible and plausibly accurate approach for predicting massively separated flows. Since its inception the method has been applied to a range of configurations including simple shapes such as cylinders, spheres and aircraft forebodies, in addition to complex geometries including fighter aircraft. The accuracy of DES predictions has typically been far superior to that of steady or unsteady Reynolds-averaged Navier-Stokes methods while at the same time avoiding the Reynolds-number limitations that plague Large-Eddy Simulation. Based on research performed to date, the method appears sound and responds well to the type of boundary layer separation (i.e., laminar or turbulent), and to grid refinement. However, it is possible to degrade predictions using a grid density that is both too fine for RANS and too coarse for LES. Examples of applications of the technique are presented, along with a summary of some of the important findings and directions for future research.