Efficient techniques for computational aeroelasticity (CA) on unstructured meshes are investigated. These include the formulation of a fourth-order implicit Runge-Kutta timeintegration scheme (IRK64) and a third-order backwards difference time-integration scheme (BDF3) as well as a second-order backwards difference time-integration scheme (BDF2) for the coupled system of flow and structural equ...

The presented investigation is motivated by the need to uncover connections between underlying rotor fluid-structure interactions and vortex dynamics fatigue performance characterization of flexible blades, their hub, supporting superstructure. Towards this effort, temporal stability characteristics tip vortices shed from blades are investigated numerically. An aeroelastic free-vortex wake meth...

In this paper we present, the design and modeling of the novel nonlinear limiter control feedback control plant [Myneni et al., 1999; Corron et al., 2000; Corron & Pethel, 2002], applied for the first time here in an aeroelastic system, and actuated as a jet reaction torquer control of a wing with potentially chaotic dynamics. This study will provide a better understanding of the nonlinear dyna...

A large-scale, real-world application of Evolutionary Multi-Objective Optimization is reported. The Multidisciplinary Design Optimization among aerodynamics, structures, and aeroelasticity of the wing of a transonic regional jet aircraft was performed using highfidelity evaluation models. Euler and Navier-Stokes solvers were employed for aerodynamic evaluation. The commercial software NASTRAN w...

Most of the previous studies on free-play aeroelasticity were based linear aerodynamic theory, which cannot consider nonlinear effects. This paper proposes a framework computational fluid dynamics/computational structural dynamics (CFD/CSD) coupling approach that can deal with three dimensional aeroelastic problems both nonlinearity and nonlinearity. The fictitious mass method is used to constr...

Aeroelastic instabilities are some of the critical issues affecting reliability and safety military commercial aircraft. In this study, a coupled computational fluid dynamics structural (CFD-CSD) capability was developed for transonic aeroelasticity analysis in time domain. To expedite application CFD solver aeroelastic simulations, morphing technique mesh deformation CFD, eliminating successiv...

Abstract Tiltrotor aircraft are growing in prevalence due to the usefulness of their unique flight envelope. However, aeroelastic stability—particularly whirl flutter stability—is a major design influence that demands accurate prediction. Several nonlinearities may be present tiltrotor systems, such as freeplay, often neglected for simplicity, either modelling or stability analysis. effects can...

Along with the development of advanced high-performance aero-engines to higher thrust-weight ratio, further improvement stage load, adoption new materials and lightweight structures, aeroelasticity blade structure is becoming more prominent. The high cycle fatigue failure blades significantly reduces structural reliability during process using. At same time, a large number forms aero-engine exp...

Structural dynamics of wind turbines aims at assessing the integrity and reliability of the complete construction against varying external loading over the targeted life time. Since wind induced excitation is the most important, structural dynamics is closely connected to aeroelasticity. Most of structural analysis is based on modelling while tests are reserved for prototype assessment. To this...