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Final published version
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - Feasibility of the Navier-Stokes harmonic balance method for modelling aircraft unsteady aerodynamics
AU - Drofelnik, J.
AU - Ronch, A.D.
AU - Sergio Campobasso, M.
PY - 2018/9/9
Y1 - 2018/9/9
N2 - Traditionally, the models of the unsteady aerodynamic loads needed for aircraft flight simulations have been estimated using the aerodynamic derivatives approach, which, using linear aerodynamic models, provides the influence of the aircraft motion rates on the aerodynamic forces and moments. With increasing aircraft maneuverability resulting in nonlinear unsteady flow regimes, however, the linearity assumption of the conventional aerodynamic derivatives approach makes the method questionable. Methods with higher reliability have been show to be achievable by using knowledge of the aircraft aerodynamic response to harmonic excitations. Prompted by the need of rapidly and accurately estimating such response, this study demonstrates the applicability of the nonlinear frequency-domain Navier-Stokes Harmonic Balance method for predicting periodic aircraft flows with low and high levels of nonlinearity. Using the NASA Common Research Model aircraft case study, it is found that the Harmonic Balance technology yields estimates of the unsteady forces differing negligibly from those of the standard time-domain Navier-Stokes method with a runtime analysis reduced by at least one order of magnitude over that of the time-domain approach. © 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018. All rights reserved.
AB - Traditionally, the models of the unsteady aerodynamic loads needed for aircraft flight simulations have been estimated using the aerodynamic derivatives approach, which, using linear aerodynamic models, provides the influence of the aircraft motion rates on the aerodynamic forces and moments. With increasing aircraft maneuverability resulting in nonlinear unsteady flow regimes, however, the linearity assumption of the conventional aerodynamic derivatives approach makes the method questionable. Methods with higher reliability have been show to be achievable by using knowledge of the aircraft aerodynamic response to harmonic excitations. Prompted by the need of rapidly and accurately estimating such response, this study demonstrates the applicability of the nonlinear frequency-domain Navier-Stokes Harmonic Balance method for predicting periodic aircraft flows with low and high levels of nonlinearity. Using the NASA Common Research Model aircraft case study, it is found that the Harmonic Balance technology yields estimates of the unsteady forces differing negligibly from those of the standard time-domain Navier-Stokes method with a runtime analysis reduced by at least one order of magnitude over that of the time-domain approach. © 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018. All rights reserved.
KW - Aerodynamic derivatives
KW - Aircraft flight dynamics
KW - Harmonic Balance Navier-Stokes equations
KW - NASA Common Research Model
KW - Unsteady aerodynamics
KW - Aircraft
KW - Flight dynamics
KW - Flight simulators
KW - Frequency domain analysis
KW - Harmonic analysis
KW - NASA
KW - Time domain analysis
KW - Aircraft maneuverability
KW - Harmonic balance
KW - Harmonic Balance method
KW - Linear aerodynamic model
KW - Research models
KW - Unsteady aerodynamic load
KW - Navier Stokes equations
M3 - Conference contribution/Paper
BT - ICAS 18 Proceedings
T2 - 31st Congress of the International Council of the Aeronautical Sciences
Y2 - 9 September 2018 through 14 September 2018
ER -