Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics
Full Article - Open Access.
COMPUTER SIMULATION OF FLUTTER ELEMENTS OF A SYMMETRIC AIRFOIL USING THE VIRTUAL BOUNDARY METHOD FOR FLUID-STRUCTURE INTERACTION.
The objective of the present work is an numerical analysis of flutter elements of a typical airfoil using a classical method with direct eigenvalue method for the undamped case (forced oscillation). The dynamic coupling of the airfoil structure into two-dimensional aerodynamic flow was simulated with ultra-low Reynolds number so that the aeroelastic motion of the airfoil in the flow could have simulated in the time domain. The intention was to determine the flutter elements in the small wings (like a Micro air vehicle), using a twodimensional aerodynamic code based on Virtual Boundary Method, suitably coupled to the airfoil structural characteristics. The symmetric NACA 0012 airfoil was choosed to simulate the time history of flow parameters. The airfoil was considered as a rigid section, supported by translational and rotational springs, so that only heave and pitch degrees of freedom are permitted at the point of support. The pitching and heaving movements where simulated separately. The effects of forced oscillation were analyzed an attack angle of 0o for heaving, and vertical oscillation of ±0.1 of chord length; pitching of ±2o with frequency (sinusoidal), fs , of 1Hz, 2Hz, 5Hz and 10Hz. The effects of the reduced frequency (k), amplitude of forced oscillation (h) and the maximum non-dimensional flapping velocity (kh) on the thrust generation were analyzed. The pressure coefficient CP, lift L, lift coefficient CL, drag coefficient CD and pitching moment M about the support point were computed. The results obtained were compared and agree with the literature ones.
Palavras-chave: computer simulation, flutter, Virtual Boundary Method, fluid-structure interaction.,
-  Bisplinghoff R. L., Ashley H., Halfman R. L., “Aeroelasticity”. Addison Wesley Publishing Company, New York, 1955.
-  Webb C. H., “Separation and Vorticity Transport in Massively-Unsteady Low Reynolds Number Flows”. B.S., Wright State University, 2007.
-  Lian Y., ShyyW., “Aerodynamics of Low Reynolds Number Plunging Airfoil under Gusty Environment”. 45th AIAA Aerospace Sciences Meeting and Exhibit - AIAA, Reno, pp. 2007-71, 2007.
-  Peskin C. S., “The Immersed Boundary Method”. Acta Numerica, vol. 11, 2002, pp. 479-517.
-  Saiki E.M., Biringen S., “Numerical Simulation of a Cylinder in Uniform Flow: Application of a Virtual Boundary Method”. Journal of Computational Physics, vol. 123, 1996, pp. 450-46
-  Ye T., Mittal R., Udaykumar H. S., Shyy W., “Incompressible Flows with Complex Immersed Boundaries”. Journal of Computational Physics, vol. 156, 1999, pp. 209-240. 7] Varonos A., Bergeles G., “Development and assessment of a variable order non-oscilatory scheme for convection term discretization. International Journal for Numerical Methods in Fluids, vol. 26, 1998, pp. 1-1 8] Greco J´unior P. C., “Transonic Flutter and Limit Cycle Oscillations”. Universidade de São Paulo/University of Kansas, thesis, 199
-  Marques A. C. H., Doricio J. L., Greco J´unior P. C., “M´etodo da Fronteira Virtual: simulac¸ ão de escoamento incompress´ivel sobre aerofólio NACA0012 com malha não uniforme”. 29th Iberian Latin American Congress on Computational Methods in Engineering, 2008.
-  Kurtulus D. F., David L., Farcy A., Alemdaroglu N., “Aerodynamic characteristics of flapping motion in hover”. Experiments in Fluids, 44, 23-36, 200
-  Mukherjee S., ManjuprasadM., Sharma N. K., Rana D., Oncar A. K., “The domain simulation of airfoil flutter in the subsonic regime using fluid structure couplinh through panel method”. National Aerospace Laboratories, Bangalore, India, STTD0825, 2008.
MARQUES, A. C. H.; "COMPUTER SIMULATION OF FLUTTER ELEMENTS OF A SYMMETRIC AIRFOIL USING THE VIRTUAL BOUNDARY METHOD FOR FLUID-STRUCTURE INTERACTION.", p. 3703-3713 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1].
São Paulo: Blucher,
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-19526
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