Investigation of mixed element hybrid grid-based CFD methods for rotorcraft flow analysis

Glen R. Whitehouse, Alexander H. Boschitsch, Marlyn J. Smith, C. Eric Lynch, Richard Brown

Research output: Contribution to conferencePaper

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Abstract

Accurate first-principles flow prediction is essential to the design and development of rotorcraft, and while current numerical analysis tools can, in theory, model the complete flow field, in practice the accuracy of these tools is limited by various inherent numerical deficiencies. An approach that combines the first-principles physical modeling capability of CFD schemes with the vortex preservation capabilities of Lagrangian vortex methods has been developed recently that controls the numerical diffusion of the rotor wake in a grid-based solver by employing a vorticity-velocity, rather than primitive variable, formulation. Coupling strategies, including variable exchange protocols are evaluated using several unstructured, structured, and Cartesian-grid Reynolds Averaged Navier-Stokes (RANS)/Euler CFD solvers. Results obtained with the hybrid grid-based solvers illustrate the capability of this hybrid method to resolve vortex-dominated flow fields with lower cell counts than pure RANS/Euler methods.
Original languageEnglish
Publication statusPublished - 11 May 2010
Event66th American Helicopter Society Forum: Rising to New Heights in Vertical Lift Technology - Phoenix, Arizona
Duration: 11 May 201013 May 2010

Conference

Conference66th American Helicopter Society Forum: Rising to New Heights in Vertical Lift Technology
CityPhoenix, Arizona
Period11/05/1013/05/10

Keywords

  • lagrangian vortex method
  • numerical analysis
  • vorticity-velocity formulation
  • reynolds averaged navier-stokes (RANS)
  • euler method
  • helicopters
  • rotorcraft flow

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