HPCMP CREATE^TM-AV Kestrel Simulations for the DPW-8/AePW-4 Buffet Working Group: Part I

This paper documents some computational explorations performed for the Buffet Working Group of the combined eighth AIAA Drag Prediction Workshop and the fourth Aeroelastic Prediction Workshop. The computational explorations were performed using HPCMP CREATE TM -AV Kestrel as part of a collaborative effort between the Kestrel development team and some Kestrel users in the NASA Langley Research Center Configuration Aerodynamics Branch. The test case in question is a two-dimensional airfoil at Mach 0.73 at ten angles of attack between 1.36 degrees and 3.90 degrees, including various angles of attack that demonstrated buffeting behavior in the experiments. The simulations make use of the Spalart-Allmaras (SA) and Menter Shear Stress Transport (SST) turbulence models run in both steady and unsteady modes to compare to mean pressure and RMS pressure distributions measured experimentally. For the angles of attack pre-buffet, simulations using both turbulence models show fairly good agreement with the experimental data. For the angles of attack post-buffet, simulations using the SST turbulence model capture the trends in the data well, while the simulations using the SA turbulence model fail to demonstrate significant unsteady behavior.