in this work, harmony search meta-heuristic optimization algorithm has been developed for aerodynamic shape optimization problem for the first time. the aerodynamic shape, which has been investigated, is an airfoil with parces method for its shape parameterization. the problem was minimization of aerodynamic objective function using inverse design method and the objective function has been the ...

In nature, insects with their forewings and hindwings undergoing small-gap flapping motion experience strong aerodynamic interaction. Conventional studies mainly focus on the propulsion performance of tandem wings, while interaction between a wing fixed in configuration at low Reynolds numbers ( Re) is unclear. this paper, we numerically studied vortex structure flapping–fixed airfoil configura...

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...

Abstract We investigate the aerodynamics of a surging wind turbine with numerical simulations based on free wake panel method. start by demonstrating method’s capability to simulate plunging airfoil, which provides some insights that are later used interpret results rotor. then validate method non-surging and discuss strengths weaknesses our approach. Next, we focus UNAFLOW case: was modelled e...

The proper orthogonal decomposition (POD) has been widely used in fluid dynamic applications for extracting dominant flow features. The “gappy” POD is an extension to this method that allows the consideration of incomplete data sets. In this paper, the gappy POD is extended to handle unsteady flow reconstruction problems, such as those encountered when limited flow measurement data is available...

Departing from mainstream pitching/plunging airfoil literature, we consider scenarios where the frequencies of the plunge and the pitch are not equal. The motivation is, first, consideration of flows with very large excursions in total angle of attack, for assessment of motion time history effects; and second, an attempt to model the gust response of flapping-wing Micro Air Vehicles by consider...

Thrust generation and scaling parameters for flapping flexible wings are investigated using an integrated framework of computational fluid dynamics and structural dynamics solvers. To explore the influences of the density ratio and the effective stiffness on the thrust generation, surrogate models have been generated for a flapping thin isotropic flat Zimmerman wing in still air at = 1.5×10. Ti...

By using a combined analytical–computational methodology, a unified modelling of aerodynamic indicial functions covering the incompressible, subsonic compressible, transonic, and supersonic flight speed regimes is presented. The procedure is carried out in conjunction with a computational fluid dynamic analysis. For a plunging–pitching airfoil, selected unsteady aerodynamic load expressions hav...