Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions

Ilker Oruc, Joseph Francis Horn, Jeremy Shipman, Rajiv Shenoy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The objective of this study is the investigation of rotorcraft/terrain interactions using Navier-Stokes CFD coupled with a helicopter flight dynamics model. In the coupled simulations, the flight dynamics model is free to move within a computational domain, where the main rotor forces are translated into source terms in the momentum equations of the CFD solution. Simultaneously, the CFD calculates induced velocities that are fed back to the simulation and affect the aero loads in the flight dynamics. The CFD solver models the inflow, ground effect, and interactional aerodynamics in the flight dynamics simulation. An actuator disk model was used to map rotor blade loads into the computational domain. In order to enhance stability and efficiency of the CFD solution, rotor source terms are applied onto vertically stacked planes with a 1D Gaussian distribution. Free flight simulations were performed with full rotorcraft flight dynamics regulated by a dynamic inversion controller. Simulation results are shown for a helicopter hovering in ground effect at different altitudes above the ground, over partial ground, sloped ground and near a wall. An acceleration maneuver was performed in low forward speed conditions where a ground vortex is expected. In order to verify CFD predictions, predicted outwash flows were compared with recently published measurement data and showed reasonable correlation. In ground effect simulations are shown to predict the power reduction when the helicopter flies in close proximity to the terrain.

Original languageEnglish (US)
Title of host publicationAIAA Modeling and Simulation Technologies Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103872
StatePublished - Jan 1 2016
EventAIAA Modeling and Simulation Technologies Conference, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

NameAIAA Modeling and Simulation Technologies Conference

Other

OtherAIAA Modeling and Simulation Technologies Conference, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

Fingerprint

Flight Simulation
Flight Dynamics
CFD Simulation
Flight dynamics
Dynamic Simulation
Computational fluid dynamics
Ground effect
Helicopter
Rotor
Interaction
Helicopters
Source Terms
Rotors
Dynamic Model
Simulation
Dynamic models
Actuator disks
Free flight
Blade
Navier-Stokes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Modeling and Simulation

Cite this

Oruc, I., Horn, J. F., Shipman, J., & Shenoy, R. (2016). Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions. In AIAA Modeling and Simulation Technologies Conference (AIAA Modeling and Simulation Technologies Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.
Oruc, Ilker ; Horn, Joseph Francis ; Shipman, Jeremy ; Shenoy, Rajiv. / Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions. AIAA Modeling and Simulation Technologies Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016. (AIAA Modeling and Simulation Technologies Conference).
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abstract = "The objective of this study is the investigation of rotorcraft/terrain interactions using Navier-Stokes CFD coupled with a helicopter flight dynamics model. In the coupled simulations, the flight dynamics model is free to move within a computational domain, where the main rotor forces are translated into source terms in the momentum equations of the CFD solution. Simultaneously, the CFD calculates induced velocities that are fed back to the simulation and affect the aero loads in the flight dynamics. The CFD solver models the inflow, ground effect, and interactional aerodynamics in the flight dynamics simulation. An actuator disk model was used to map rotor blade loads into the computational domain. In order to enhance stability and efficiency of the CFD solution, rotor source terms are applied onto vertically stacked planes with a 1D Gaussian distribution. Free flight simulations were performed with full rotorcraft flight dynamics regulated by a dynamic inversion controller. Simulation results are shown for a helicopter hovering in ground effect at different altitudes above the ground, over partial ground, sloped ground and near a wall. An acceleration maneuver was performed in low forward speed conditions where a ground vortex is expected. In order to verify CFD predictions, predicted outwash flows were compared with recently published measurement data and showed reasonable correlation. In ground effect simulations are shown to predict the power reduction when the helicopter flies in close proximity to the terrain.",
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Oruc, I, Horn, JF, Shipman, J & Shenoy, R 2016, Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions. in AIAA Modeling and Simulation Technologies Conference. AIAA Modeling and Simulation Technologies Conference, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA Modeling and Simulation Technologies Conference, 2016, San Diego, United States, 1/4/16.

Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions. / Oruc, Ilker; Horn, Joseph Francis; Shipman, Jeremy; Shenoy, Rajiv.

AIAA Modeling and Simulation Technologies Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016. (AIAA Modeling and Simulation Technologies Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Oruc I, Horn JF, Shipman J, Shenoy R. Coupled flight dynamics and CFD simulations of rotorcraft/terrain interactions. In AIAA Modeling and Simulation Technologies Conference. American Institute of Aeronautics and Astronautics Inc, AIAA. 2016. (AIAA Modeling and Simulation Technologies Conference).