Applications of Nektar++ I

Towards industrialisation of spectral/hp element method for incompressible, transitional flow around Formula 1 geometries This talk discusses the application of the high-fidelity spectral/hp element method using the open-source Nektar++ framework to simulate unsteady, transitional flow around complex 3D geometries representative of the Formula 1 industry. This study extends the work on a previously investigated industrial benchmark, the Imperial Front Wing (IFW), which is derived from the front wing and endplate design of the McLaren MP4-17D race car. A combined configuration of the IFW with a wheel in contact with a moving ground in a rolling state is considered, representing the first instance of such a configuration being simulated using higher-order methods. The rolling wheel, combined with the IFW (IFW-W), provides the most realistic industrial configuration to date. The spectral/hp element method is applied to this test case to solve the incompressible Navier-Stokes equations, simulating the flow at a Reynolds number of 2.2 × 10^5. Time-averaged results from the unsteady simulation are compared to experimental Particle Image Velocimetry (PIV) data to assess the model's fidelity, offering insights into its reliability for accurately representing key flow characteristics. This research addresses the challenges and requisites associated with achieving diverse levels of flow resolution using the under-resolved DNS/implicit LES approach. Nektar++ on transonic buffet This study investigates transonic buffet over a supercritical aerofoil using implicit wall-resolved large eddy simulations (iWRLES) conducted with the high-order spectral/hp element framework Nektar++. The ONERA OAT15A aerofoil, a widely studied benchmark, is used to explore the unsteady shock wave-boundary layer interaction. The simulations capture the unsteady shock oscillations and match the experimental shock location more accurately than conventional Reynolds-Averaged Navier-Stokes (RANS) models. The effects of inflow turbulence were also investigated, offering a deeper insight into the onset of transonic buffet with respect to the turbulence boundary layer transition.