High-order detached-eddy simulation of external aerodynamics over an SAE notchback model

摘要

This research explores the modification and implementation of a Detached-Eddy Simulation (DES) in a high-order compressible solver and its application to automotive aerodynamics. This was conducted on a 20 degrees SAE Reference Notchback Model with a Reynolds number of 2.23 x 10(5). This DES algorithm implemented within FLAMENCO, which is finite-volume research code operating over multi-block meshes, was used for all the simulations. The primary objectives were to capture unsteady flow features, separated coherent structures and also relax the meshing requirements to improve accessibility to turbulence-resolving methods for realistic configurations. This also aims to better understand the separated flow physics, especially around the base surfaces of the car. Simulations for three mesh refinement levels were compared to wind-tunnel measurements. Even on relatively coarse meshes (similar to 7m cells) for DES, time-averaged Cp was obtained with maximum errors of < 8%.