Influence of turbulence modelling and grid resolution in computations of the DPW7 CRM configuration

View Video Presentation: https://doi.org/10.2514/6.2023-4091.vid The work report our efforts dedicated to the seventh AIAA Drag Prediction Workshop, and forms a continuous investigation presented at earlier workshops. Here we have summarized our investigation of modelling and simulation methods applied to the Common Research Model wing-body tail-less configuration. Our joint contribution to DPW7 concerns mandatory RANS calculations at flow conditions specified at a Mach number of 0.85 and results from hybrid RANS-LES calculations using the flow solver M-Edge. An investigation of the sensitivity to the grid and turbulence RANS model is carried out from calculations on three successively refined grid families with two turbulence models, including the Explicit Algebraic Reynolds Stress Model (EARSM) and the Spalart-Allmaras (SA) model. Further hybrid RANS-LES calculations were carried out with the more refined grids from two grid families. The RANS results show good grid convergence with results that vary 4 drag counts or less within a grid family. Numerical results with EARSM give higher drag compared to SA and are in general somewhat closer experimental results, mainly due to a more upstream position of the shock on the wing. Hybrid RANS-LES computations produces different solutions on two different types of grids. On the unstructured grid both IDDES-SA and HYB0 models fail to capture the flow features in the outboard section of the wing leading to under prediction of the lift coefficient. On the structured grid, the computation has perceived reasonably well the mean flow but a smeared turbulence resolving capability is observed. This is closely associated to insufficient grid resolution.