Improvement of CFD-Wind Tunnel Correlation Near Buffet Onset by Using Scale Resolving Simulations
This paper is dedicated to the assessment of turbulence modeling for the aerodynamic study in transonic conditions of a long-haul business jet with a narrow fuselage, slender backswept high aspect ratio wings with fuselage mounted engines. The model of this aircraft was tested in the DNW-HST, one of the pressurized transonic facilities of the German-Dutch Wind tunnels. The CFD results were obtained using the following model: RANS Menter SST k-ω, which is the reference model, Unsteady-RANS (URANS) Menter SST k-ω and Hybrid RANS-LES (HRL) models based on the same SST model. The used hybrid RANS-LES models are: the SAS (Scale Adaptive Simulation) and the SBES model (Stress-Blended Eddy Simulation) based on the WALE model. Another feature that was investigated was the influence of the use of upwind-central reconstruction blending and the use of a dedicated laminar-turbulent transition model. A special attention was paid to properly capture the aerodynamic coefficients at angle-of-attack of 5.5°, corresponding to buffet. The buffet is an unwanted unsteady phenomenon characterized by the interaction of the shock wave and the detached boundary layer formed behind it. The final goal was to find the most economic and robust turbulence model able to capture the aerodynamic coefficients given an acceptable accuracy.
The authors would like to express their gratitude for all the support in writing this paper to the following people: Professor Hua Jun from the CAE and Roy Gebbink from DNW for making available the wind tunnel results for comparison and validation.
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