An investigation of ship airwake phenomena using time-accurate CFD and piloted helicopter flight simulation

Forrest, J. S. and Hodge, S. J. and Owen, I. and Padfield, G. D. (2008) An investigation of ship airwake phenomena using time-accurate CFD and piloted helicopter flight simulation. In: 34th European Rotorcraft Forum 2008, ERF34, 16 - 19 September 2008, Liverpool, UK.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive

Abstract

This paper describes the use of Computational Fluid Dynamics (CFD) data to improve the fidelity of helicopter-ship dynamic interface simulation. Time-accurate airwakes for the simple frigate shape (SFS2) and a Type 23 Frigate have been computed for a number of wind-overdeck (WOD) angles to provide a realistic flow field in which to perform simulated deck landings within the FLIGHTLAB flight simulation environment. CFD predictions show good agreement with both wind tunnel data and full scale at-sea experimental data. Results from piloted flight trials using the University of Liverpool full-motion simulator are presented in detail. Pilot workload ratings resulting from the trials have been used to generate two Ship-Helicopter Operating Limits (SHOL) diagrams for a Lynx-like helicopter: one operating from the SFS2 and the other from a Type 23 Frigate. Pilot control activity for several WOD cases has been analysed in order to identify the nature of the interactions between airwake turbulence and the helicopter aerodynamic model. It is shown that the location and magnitude of velocity fluctuations on the rotor disk have a significant impact on the control activity required to maintain station over the landing spot. This study builds on earlier work performed at Liverpool and provides a platform for such simulations being used to reduce at-sea trials, and to provide a safe environment for pilot training.

Additional Information:Conference Code:84114
Keywords:Aerodynamic models, Airwakes, Control activities, Deck landing, Experimental data, Flight simulation, Flight trials, Full scale, Motion simulator, Operating limit, Pilot control activities, Pilot training, Pilot workload, Rotor disks, Sea trial, Ship airwakes, Ship dynamic interface, Significant impacts, Time-accurate, Time-accurate CFD, Type 23 frigates, University of Liverpool, Velocity fluctuations, Wind-tunnel data, Aerodynamics, Aircraft, Computational fluid dynamics, Helicopter rotors, Landing, Ships, Underwater construction, Flight simulators
Subjects:H Engineering > H141 Fluid Mechanics
H Engineering > H410 Aeronautical Engineering
Divisions:College of Science > School of Engineering
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ID Code:18253
Deposited On:17 Aug 2015 09:08

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