Aeroelastic and Aerothermoelastic Behavior in Hypersonic Flow
Jack J. McNamara,Jack J. McNamara,Peretz P. Friedmann,Kenneth G. Powell,B. J. Thuruthimattam,Robert E. Bartels +5 more
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In this article, the authors performed a systematic computational study of the hypersonic aeroelastic and aerothermoelastic behavior of a three-dimensional configuration of a low-aspect-ratio wing.Abstract:
The testing of aeroelastically and aerothermoelastically scaled wind-tunnel models in hypersonic flow is not feasible; thus, computational aeroelasticity and aerothermoelasticity are essential to the development of hypersonic vehicles. Several fundamental issues in this area are examined by performing a systematic computational study of the hypersonic aeroelastic and aerothermoelastic behavior of a three-dimensional configuration. Specifically, the flutter boundary of a low-aspect-ratio wing, representative of a fin or control surface on a hypersonic vehicle, is studied over a range of altitudes using third-order piston theory and Euler and Navier-Stokes aerodynamics. The sensitivity of the computational-fluid-dynamics-based aeroelastic analysis to grid resolution and parameters governing temporal accuracy are considered. In general, good agreement at moderate-to-high altitudes was observed for the three aerodynamic models. However, the wing flutters at unrealistic Mach numbers in the absence of aerodynamic heating. Therefore, because aerodynamic heating is an inherent feature of hypersonic flight and the aeroelastic behavior of a vehicle is sensitive to structural variations caused by heating, an aerothermoelastic methodology is developed that incorporates the heat transfer between the fluid and structure based on computational-fluid-dynamics-generated aerodynamic heating. The aerothermoelastic solution procedure is then applied to the low-aspect-ratio wing operating on a representative hypersonic trajectory. In the latter study, the sensitivity of the flutter margin to perturbations in trajectory angle of attack and Mach number is considered. Significant reductions in the flutter boundary of the heated wing are observed. The wing is also found to be susceptible to thermal buckling.read more
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Journal ArticleDOI
Aeroelastic and Aerothermoelastic Analysis in Hypersonic Flow: Past, Present, and Future
TL;DR: In this article, it is shown that the body, surface panels, and aerodynamic control surfaces are flexible due to minimum-weight restrictions for hypersonic vehicle configurations, and that these flexible body designs will consist of long, slender lifting body designs.
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Studies on Fluid-Thermal-Structural Coupling for Aerothermoelasticity in Hypersonic Flow
Adam J. Culler,Jack J. McNamara +1 more
TL;DR: In this paper, the tradeoff between computational cost and accuracy is evaluated for aerothermoelastic analysis based on either quasi-static or time-averaged dynamic fluid-thermal-structural coupling, as well as computational fluid dynamics based reduced-order modeling of the aerodynamic heat flux.
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Approximate Modeling of Unsteady Aerodynamics for Hypersonic Aeroelasticity
TL;DR: In this paper, various approximations to unsteady aerodynamics are examined for the aero-elastic analysis of a thin double-wedge airfoil in hypersonic flow.
Journal ArticleDOI
Reduced-Order Aerothermoelastic Framework for Hypersonic Vehicle Control Simulation
TL;DR: In this article, an aerothermoelastic framework with reduced-order aerothermal, heat transfer, and structural dynamic models for time-domain simulation of hypersonic vehicles is presented.
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Model Reduction of Computational Aerothermodynamics for Hypersonic Aerothermoelasticity
TL;DR: This study examines two model reduction strategies with the goal to enable the use of computational fluid dynamics within a long time-record, dynamic, aerothermoelastic analysis.
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