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Abstract High-speed low-pressure turbine blades (HS-LPT) are a key component in the development of high-efficiency geared engine architectures. High-fidelity CFD simulations are progressively being integrated into the design process of engine components, to get a better insight in the complex flow behavior and guide the shape optimization process. The current study presents Very-Large Eddy Simulations (VLES) of the flow across a HS-LPT, using Lattice-Boltzmann Methods (LBM). Different solvers of the commercial software SIMULIA PowerFLOW® have been used for this study. The selected benchmark case is the SPLEEN cascade, a next-generation HS-LPT cascade rig developed by Von Karman Institute and Safran Aircraft Engines, as part of a large European collaborative project. A subset of the large amount of available test rig data has been used here to benchmark the CFD solver. Hence, the study aims at assessing the ability of this numerical methodology to predict several complex flow phenomena occurring at engine relevant Mach and Reynolds numbers. For instance, we observed (1) unsteady transonic flows, (2) laminar separation bubble, (3) natural laminar-to-turbulent transition, (4) unsteady bypass transition due to wake impingement coming from upstream turbulence, (5) endwall 3D effects, (6) corner stall separation and (7) fluctuation of the flow due to periodic wakes coming from translating bars representing wakes of upstream rotor.
Hullin et al. (Mon,) studied this question.