The flow past the Boeing Transonic Truss-Braced Wing (TTBW) aircraft is simulated with a Hybrid Reynolds-Averaged Navier–Stokes Large-Eddy Simulations (HRLES) turbulence modeling approach to study transonic buffet onset and evaluate the predictive capability of the numerical approach. The HRLES model that is used in this work is a zonal detached eddy simulations (ZDES) method. All simulations used structured overset curvilinear grids for the free-air configuration, with all simulations performed using the Launch, Ascent, and Vehicle Aerodynamics (LAVA) computational framework. Aerodynamic loads and surface pressure obtained from the HRLES solutions are compared to results from unsteady RANS (URANS) and experiments conducted at NASA Ames Research Center 11- by 11-Foot Transonic Wind Tunnel. Overall good agreement is obtained in the predicted loads and surface pressure. Unsteady pressure data from HRLES and URANS simulations is used to compute the power spectral density (PSD) to predict transonic buffet onset and compared to the Kulite data obtained from the experiment. Comparisons of the PSD spectrum also show reasonable agreement with the wind-tunnel data, with HRLES and URANS predicting buffet onset at a slightly earlier angle of attack than the experiment.

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This work was funded by the NASA Advanced Air Transport Technology (AATT) and Transformational Tools and Technologies (TTT) Projects. Computer time has been provided by the NASA Advanced Supercomputing (NAS) facility at NASA Ames Research Center. The authors appreciated the help of Gregory Zilliac (NASA Ames) and Max Amaya (NASA Ames) with obtaining and discussing the experimental data. The authors also appreciated the help of Leonardo Machado (NASA Ames) with reviewing this paper and Francois Cadieux (NASA Ames) with both reviewing this paper and many fruitful discussions. The authors also thank Gerrit Stich (NASA Ames) for providing help with postprocessing some of the data.

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Received7 March 2024
Accepted8 July 2024
Published online7 October 2024

Predicting Transonic Buffet Onset for the Boeing Transonic Truss-Braced Wing Aircraft

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