Kestrel KCFD and FUN3D Results for the 4th AIAA High Lift Prediction Workshop

Lofthouse, Andrew (US Air Force Life Cycle Management Center)

Lofthouse, Andrew


This presentation will describe a study of the high-lift common research model (CRM) from the 4th AIAA High Lift Prediction Workshop using the Kestrel KCFD and the NASA FUN3D computational fluid dynamics (CFD) flow solvers. Accurate predictions of high lift configurations are important for accurate assessment of maximum lift, which directly affects landing and take-off performance. High lift configurations, with deployed slats and flaps, have consistently challenged computational methods due to the highly complex flow structures, including turbulence transition and separation. Modern scale-resolving turbulence models, coupled with high spatial resolution meshes, and small time steps (thus increasing computational expense) are shown to be required for accurate predictions of maximum lift. Several meshes provided by the workshop committee and workshop participants are used. Kestrel solutions using a trimmed near-body unstructured mesh overset on a Cartesian, adaptively refined off-body mesh are also shown. The lessons learned from this study will determine the strategy used for a study of the aerodynamic effect of new engines for the B-52 as part of the B-52 Commercial Engine Replacement Program (CERP). This study is part of an FY22 HPCMP Frontier Applied Acquisition and Sustainment project.