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This article summarizes the capabilities and development of the Helios version 2.0, or Shasta, software for rotary wing simulations. Specific capabilities enabled by Shasta include off-body adaptive mesh refinement and the ability to handle multiple interacting rotorcraft components such as the fuselage, rotors, flaps and stores. In addition, a new run-mode to handle maneuvering flight has been added. Fundamental changes of the Helios interfaces have been introduced to streamline the integration of these capabilities. Various modifications have also been carried out in the underlying modules for near-body solution, off-body solution, domain connectivity, rotor fluid structure interface and comprehensive analysis to accommodate these interfaces and to enhance operational robustness and efficiency. Results are presented to demonstrate the mesh adaptation features of the software for the NACA0015 wing, TRAM rotor in hover and the UH-60A in forward flight.

This paper presents an overview of new capabilities in the Helios v3, or Rainier, highfidelity rotorcraft simulation software. Key new capabilities include the addition of DES turbulence modeling in the near-body solver and RANS in the off-body solver, introduction of Richardson extrapolation-based error control to automate off-body AMR, and runtime parallel partitioning of near-body grids. We also report on advances made in Helios to support loose-coupling rotor-fuselage and multi-rotor configurations. The paper describes these capability enhancements in detail and provides validation results and computational performance metrics for the model TRAM rotor, HART-II, and UH-60A configurations.