Hybrid RANS-LES Computations of Turbulent Flow over Rudimentary Landing Gear

Turbulence-resolving computations were conducted for the flow over a rudimentary landing gear (RLG) using the SA-DDES (Delayed Detached Eddy Simulation) model and an algebraic zero-equation hybrid model (HYB0). Linked to flow-induced noise generation, the emphasis of the computations has been placed on the verification of hybrid RANS-LES methods in predicting surface pressure and its fluctuations in comparison with available experimental measurements. A common structured grid was used in the computations with both models and, additionally, a computation was also undertaken using the HYB0 model on an unstructured grid. Both models have shown similar performance with reasonable predictive capabilities of capturing the general flow features. Nonetheless, the discrepancy observed in the prediction of surface pressure fluctuations suggests that the effect of temporal and spatial resolution is significant.