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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Flutter Analysis using a Fully Coupled Density Based Solver for Inviscid Flow
H.I. Kassem, X. Liu and J.R. Banerjee
School of Engineering and Mathematical Sciences, City University, London, United Kingdom
H.I. Kassem, X. Liu, J.R. Banerjee, "Flutter Analysis using a Fully Coupled Density Based Solver for Inviscid Flow", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 146, 2014. doi:10.4203/ccp.106.146
Keywords: aeroelasticity, computational fluid dynamics, transonic flow, flutter..
This paper focuses on the coupling between the high fidelity aerodynamic model for the flow field with the heave and pitch behaviour of a typical wing section to predict its transonic flutter speed. This coupled aeroelastic model is implemented in one of the most widely used open source computational fluid dynamics codes called OpenFOAM. The model is designed to compute the structural displacement in the time domain based on the free vibration modes of the structure resulting from the modal analysis. To this end, the problem requires the solution of a second order ordinary differential equation for each mode as a function of the generalized coordinates. A density based solver using the central difference scheme of Kurganov and Tadmor is used to model the flow field. Based on the theory and methodology presented in this paper, two case studies was investigated to obtain numerical results. The first one is a NACA 64A010 aerofoil pitching about its quarter-chord whereas the second case study uses the same aerofoil, but with both heave and pitch motion. The self-sustained two degrees of freedom in the second case study are modelled for three different possibilities covering damped, neutral and divergent oscillations. The predicted results show excellent agreement with the numerical and experimental data available in the literature.
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