Wall-modeled LES of transonic buffet over NASA-CRM using Cartesian-grid-based flow solver FFVHC-ACE

Abstract

This study demonstrates the capability of the wall-modeled large-eddy simulation for predicting buffet phenomena over a 3D aircraft configuration. For the WMLES around complex 3D geometries, the Cartesian-grid-based flow solver FrontFlow/Violet Hierarchical Cartesian for Aeronautics based on Compressible-flow Equations (FFVHC-ACE) is employed. To extend the applicability of FFVHC-ACE to transonic flow simulations, the authors develop a hybrid scheme between the kinetic-energy-and-entropy-preserving and total-variation-diminishing schemes. This numerical scheme simultaneously realizes low dissipation in turbulent boundary layers and robust shock-capturing in the simulation of transonic flows around the NASA common-research model at high angles of attack. The results reproduce the wavy structures of the shock wave (i.e., buffet cells) advecting outboard, which shows good agreement with the previous experimental studies.