Wing flutter analysis with an uncoupled method

Kavukcuoğlu, Koray
In this thesis, flutter of AGARD Wing 445.6 is predicted with a new approach. The unsteady aerodynamic loads are calculated with an unstructured Euler solver. Surface interpolation is used to transfer the calculated mode shapes from the structural mesh to the CFD mesh and to transfer pressure distributions in the opposite direction. Using the transferred pressure distributions, nodal force distributions on the finite element model are calculated. A polynomial is fitted to the nodal forces in terms of the reduced frequency. The resulting polynomial eigenvalue problem is solved to obtain flutter frequency.


Wing Flexibility Effects in Clap-and-Fling
Perçin, Mustafa; van Oudheusden, B. W.; Remes, B.; Scarano, F. (2011-12-01)
The work explores the use of time-resolved tomographic PIV measurements to study a flapping-wing model, the related vortex generation mechanisms and the effect of wing flexibility on the clap-and-fling movement in particular. An experimental setup is designed and realized in a water tank by use of a single wing model and a mirror plate to simulate the wing interaction that is involved in clap-and-fling motion. The wing model used in the experiments has the same planform with the DelFly II wings and consists...
MDAO for aerodynamic assessment of a morphed wing for the loiter segment of a UAV flight mission
Yang, Yosheph; Özgen, Serkan; Yaman, Yavuz; Ciarella, Andrea; Hahn, Marco; Beaverstock, Chris S.; Friswell, Michael I. (2016-01-01)
In this paper a detailed overview of a framework for an optimization of a morphing wing is presented. The framework presented here aids the design process of a morphing UAV wing which includes the variety of the flight phases and morphing concepts. The framework consists of two main solvers to compute the aerodynamic assessment of the wing: a fast low-fidelity module that solves the aeroelastic problem by coupling a geometrically nonlinear structural model to a potential flow aerodynamic model and a high-fi...
Validation of a particle simulation approach
Eneren, Şeyma Pinar; Çöker, Demirkan; Çıray, Cahit; Department of Aerospace Engineering (2016)
This thesis is intended to study the fluid behaviour with a new approach through the particle simulation technique. The fluid is considered to be under static conditions, and the activity of fluid particles is simulated. The method in the approach is mathematically exact. Instantaneous velocities are calculated with simple algebraic equations. Hence high efficiency in CPU time is achieved. In order to validate the method, the probability density function of the Maxwell-Boltzmann speed distribution and the p...
Pressure field estimation from particle image velocimetry data
Günaydınoğlu, Erkan; Kurtuluş, Dilek Funda; Department of Aerospace Engineering (2018)
In this thesis, a methodology is proposed to estimate pressure fields from particle image velocimetry measurements. The methodology uses the velocity fields acquired from the experiments as initial and boundary condition and employs Semi-Implicit Method for Pressure Linked Equations algorithm to solve governing equations. Finite volume method is employed with high order discretization scheme for solution of steady and transient flows. The methodology is validated with theoretical flows and further verified ...
Aerodynamic shape optimization of a wing using 3d flow solutions with su2 and response surface methodology
Yıldırım, Berkay Yasin; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2021-4)
In this study, the aerodynamic shape optimization of a wing is performed by using 3D flow solutions together with response surface methodology. The purpose of this study is to optimize the aerodynamic shape of a wing to achieve the lowest possible drag coefficient while ensuring desired maneuvering capability and lateral stability. Aerodynamic shape optimization is performed for a wing of a turboprop trainer aircraft. Optimization objective and constraints are determined according to mission requirements an...
Citation Formats
K. Kavukcuoğlu, “Wing flutter analysis with an uncoupled method,” M.S. - Master of Science, Middle East Technical University, 2003.