Background and Motivation
Separated turbulent flows, including phenomena such as stall and vortex-induced lift, remain one of the major challenges in aerospace aerodynamics. The current industrial standard is based on the Reynolds-Averaged Navier–Stokes (RANS) approach, which offers an attractive balance between accuracy and computational cost. However, even the most advanced Reynolds Stress Transport models often struggle to accurately capture the complex physics associated with massively separated turbulent flows.
As a result, scale-resolving simulation techniques are required to achieve the predictive accuracy needed for advanced aerodynamic applications. Among these methods, hybrid RANS/LES approaches are widely regarded as the most promising solution from an industrial perspective, as they combine the robustness and efficiency of RANS with the improved flow-physics representation of Large Eddy Simulation (LES).
Objectives of AD/AG-61
The AD/AG-61 Action Group will investigate the application of LES methodologies beyond the conventional LES region and into portions of the outer boundary-layer zone that are traditionally treated using RANS. The near-wall inner region will continue to be modelled using RANS techniques.
This work builds upon experience and knowledge acquired through several European research projects, as well as previous GARTEUR Action Groups AD/AG-49 and AD/AG-54.
Validation and Verification Test Cases
To support the development, verification and validation of Wall-Modelled Large Eddy Simulation (WMLES) and Embedded LES methodologies, the following benchmark cases will be considered:
- Mixing co-flow of a wake and a boundary layer
- Shock-wave/boundary-layer interaction (SWBLI)
- Shallow flow separation from a smooth surface
- Fundamental WMLES benchmark: zero-pressure-gradient (ZPG) flat-plate boundary layer
These test cases have been selected to provide a progressive assessment of modelling capabilities across a range of flow phenomena relevant to aerospace applications.
Chair: Nicolas Renard, ONERA
Co-Chair: Saleh Rezaeiravesh, University of Manchester
Monitoring responsable: Jean-Luc Hantrais-Gervois, ONERA
