Nonlinear Aeroelastic Analysis Using a CFD-Based State Space ROM

2014

Journal of Aircraft

Section: A Agard 4456 Wingmentioning

confidence: 99%

Reduced-Order Modeling of Unsteady Aerodynamics Across Multiple Mach Regimes

2014

Journal of Aircraft

“…The wing has also been widely used for computational aeroelastic studies. 3,[17][18][19][20] The grid is a structured 65 × 193 × 41 grid with the i direction being along the span, j direction along the chord, and k direction normal to the wing surface. Figure 2 shows the grid as well as a zoomed-in figure of the wing itself.…”

Section: Basic Problem Definition and Setupmentioning

confidence: 99%

On the Applicability of an Unsteady Aerodynamic ROM to the Transonic Flight Regime

AIAA Atmospheric Flight Mechanics Conference

2011

Accurate prediction of aerodynamic loads throughout multiple flight regimes is vital for the development of control algorithms for vehicles which pass through different regimes during the course of a flight. As such, a reducedorder modeling methodology based on linear convolution combined with a nonlinear correction factor initially developed for hypersonic flight has been extended to the transonic flight regime. Errors mostly remained small when the unsteady lift, drag and moment coefficient results were compared with direct CFD simulations over a range of oscillation frequencies and amplitudes, though the drag coefficient did show larger errors at higher oscillation frequencies. A methodology to determine the optimal number and location in the parameter space of the ROM construction sampling points has also been developed. Results showed good agreement between the coefficients calculated by this method and those calculated by direct CFD simulation.

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“…10 Munteanu et al have also developed a Volterra-based kernel identification technique 11 and state-space ROM. 12 Lucia and Beran 13 developed a method combining Volterra series with POD in order to more efficiently calculate a ROM in situations where response values need to be calculated in a large amount of locations, as in a large domain. These efforts were conducted primarily at the transonic regime and not at the hypersonic regime.…”

Section: Introductionmentioning

confidence: 99%

Reduced-Order Modeling of Hypersonic Vehicle Unsteady Aerodynamics

AIAA Atmospheric Flight Mechanics Conference

2010