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    Time-Spectral Rotorcraft Simulations on Overset Grids

    Time-Spectral Rotorcraft Simulations on Overset Grids


    The Time-Spectral method is derived as a Fourier collocation scheme and applied to NASA's overset Reynolds-averaged Navier-Stokes (RANS) solver OVERFLOW. The paper outlines the Time-Spectral OVERFLOWimplementation. Successful low-speed laminar plunging NACA 0012 airfoil simulations demonstrate the capability of the Time-Spectral method to resolve the highly-vortical wakes typical of more expensive three-dimensional rotorcraft configurations. Dealiasing, in the form of spectral vanishing viscosity (SVV), facilitates the convergence of Time-Spectral calculations of high-frequency flows. Finally, simulations of the isolated V-22 Osprey tiltrotor for both hover and forward (edgewise) flight validate the three-dimensional Time-Spectral OVERFLOW implementation. The Time-Spectral hover simulation matches the time-accurate calculation using a single harmonic. Significantly more temporal modes and SVV are required to accurately compute the forward flight case because of its more active, high-frequency wake.

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    Titel :

    Time-Spectral Rotorcraft Simulations on Overset Grids

    Beteiligte:
    I. J. Leffell (Autor:in) / M. S. Murman (Autor:in) / H. T. Pulliam (Autor:in)
    Erscheinungsdatum :

    2014

    Format / Umfang :

    28 pages

    Medientyp :

    Report

    Format :

    Keine Angabe

    Sprache :

    Englisch

    Schlagwörter :

    Aerodynamics , REYNOLDS AVERAGING , NAVIER-STOKES EQUATION , LOW SPEED , V-22 AIRCRAFT , ROTARY WING AIRCRAFT , SPECTRAL METHODS , AIRFOILS , WAKES , HARMONIC ANALYSIS , FOURIER SERIES , TILT ROTOR AIRCRAFT , COMPUTATIONAL GRIDS

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    Time-Spectral Rotorcraft Simulations on Overset Grids

    Leffell, Joshua I. / Murman, Scott M. / Pulliam, Thomas H. | NTRS | 2014

    Time-Spectral Rotorcraft Simulations on Overset Grids

    Leffell, Joshua I. / Murman, Scott M. / Pulliam, Thomas H. | AIAA | 2014

    Time-Spectral Rotorcraft Simulations on Overset Grids (AIAA 2014-3258)

    Leffell, J. / Murman, S. / Pulliam, T. et al. | British Library Conference Proceedings | 2014

    Dynamic Rotorcraft Applications Using Overset Grids

    Potsdam, M. / Royal Aeronautical Society | British Library Conference Proceedings | 2005

    Optimization of Overset Solution Adaptive Grids for Hovering Rotorcraft Flows

    Holst, T.L. / Pulliam, T.H. / AHS International | British Library Conference Proceedings | 2010

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