Correction: Application of CREATE-AV Helios to XV-15 Tiltrotor

The Helios Cartesian-based Reduced Order Aerodynamics Model (ROAM) is applied to hover calculations of the Bell XV-15 tiltrotor aircraft, compared to traditional high-fidelity calculations using body-fitted grids with OVERFLOW and FUN3D. A full vehicle model with control surfaces is used with loosely coupled CFD/CSD trim provided through RCAS. Computed results are compared to XV-15 flight test data for a range of flap and flaperon angles. The overall vehicle download predicted by ROAM is comparable to high-fidelity at higher flap angles, typically used in flight, but there are key differences in component loads. Relative to the high-fidelity solution, ROAM overpredicts the fuselage and wing download and under predicts the wing flap and flaperon loads. However, the speed offered by ROAM is compelling. On an 8 node/1024 core parallel CPU system, ROAM computes a solution in about 12 hours compared to almost 3 weeks with traditional high-fidelity, a savings of about 40X. On a relatively small HPC system composed of 4 NVIDIA A100 GPUs, ROAM computes a 70-rev solution in 4.7 hours, a further savings of 2.6X over the 8 node CPU-based calculation.