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Journal of Applied Nonlinear Dynamics 4(3) (2015) 305--312 | DOI:10.5890/JAND.2015.09.010

Wei Kang$^{1}$, Min Xu$^{1}$, Jia-Zhong Zhang$^{2}$

$^{1}$ School of Astronautics, Northwestern Polytechnical University, Xi’an, Shaanxi Province, 710072, P.R. of China

$^{2}$ School of Energy and Power Engineering, Xi’an Jiaotong University, Shaanxi Province, 710049, P.R. China

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Abstract

Foreign Object Debris (FOD) is debris or article alien, which may A fluid structure interaction method for an airfoil with a local flexible structure is presented for flow control of Micro Air Vehicles. An improved ALE-CBS scheme is developed for unsteady viscous flow coupling in combination with the theory of shallow arch with large deformation. After the verification of the presented algorithm, the method is used to study the interaction between flow and airfoil with a local flexible structure with different elastic stiffness. The momentum and energy exchange are investigated to reveal the unsteady coupling effects on aerodynamic performance. The results show that the coupling between fluid and structure enhances the momentum and energy exchange from main flow into the boundary layer. It induces the separation bubble moving downstream, and decreases the negative pressure in the separation zone on the upper surface, which leads to lift enhancement. The utilization of local flexible structure can be considered as an effective flow control technique for enhancement of the aerodynamic performance of Micro Air Vehicles.

Acknowledgments

The research is supported by the National Natural Science Foundation of China (Grant No. 11402212), the Fundamental Research Funds for the Central Universities, No. 3102014JCQ01002 and the National High Technology Research Program of China (863 Program), No. S2012AA052303.

References

1. [1]	Smith, R. and Shyy, W., (1995). Computation of unsteady laminar flow over a flexible two-dimensional membrane wing. Physics of Fluids, 7(9), 2175-2185.

2. [2]	Shyy, W., (2008). Aerodynamics of low reynolds number flyers. Cambridge Univ Press.

3. [3]	Shyy, W., Berg, M. and Ljungqvist, D., (1999). Flapping and flexible wings for biological and micro air vehicles. Progress in Aerospace Sciences, 35(5), 455-505.

4. [4]	Gordnier, R.E., (2009). High fidelity computational simulation of a membrane wing airfoil. Journal of fluids and structures, 25(5), 897-917.

5. [5]	Lian, Y., Shyy, W., Viieru, D. and Zhang, B., (2003). Membrane wing aerodynamics for micro air vehicles. Progress in Aerospace Sciences, 39(6-7), 425-465.

6. [6]	Mueller, T.J. and DeLaurier, J.D., (2003). Aerodynamics of small vehicles. Annual Review of Fluid Mechanics, 35(1), 89-111.

7. [7]	Rojratsirikul, P., Wang, Z. and Gursul, I., (2009). Unsteady fluid-structure interactions of membrane airfoils at low Reynolds numbers. Exp Fluids, 46(5), 859-872.

8. [8]	Sinha, S.K. and Ravande, S.V., (2006). Drag reduction of natural laminar flow airfoils with a flexible surface deturbulator. AIAA Paper, 3030, 5-8.

9. [9]	Sahin, M., Sankar, L.N., Chandrasekhara, M. and Tung, C., (2003). Dynamic stall alleviation using a deformable leading edge concept-a numerical study. Journal of aircraft, 40(1), 77-85.

10. [10]	Kang, W., Zhang, J.Z., Lei, P.F. and Xu, M., (2014). Computation of unsteady viscous flow around a locally flexible airfoil at low Reynolds number. Journal of Fluids and Structures, 46, 42-58.

11. [11]	Kang, W., Zhang, J.Z. and Liu, Y., (2010). Numerical simulation and aeroelastic analysis of a local flexible airfoil at low Reynolds numbers, the 8th Asian CFD conference, Hongkong.

12. [12]	Kang, W., Zhang, J.Z. and Feng, P.H., (2012). Aerodynamic analysis of a localized flexible airfoil at low reynolds numbers. Communications in Computational Physics, 11(4), 1300-1310.

13. [13]	Zhang, J.Z., Liu, Y., Lei, P.F. and Sun, X., (2007). Dynamic snap-through buckling analysis of shallow arches under impact load based on approximate inertial manifolds. Dynamics of Continuous Discrete and Impulsive Systems-Series B-Applications & Algorithms, 14, 287-291.

14. [14]	Kang, W., Zhang, J.Z., Ren, S. and Lei, P.F., Nonlinear galerkin method for low-dimensional modeling of fluid dynamic system using pod modes. Communications in Nonlinear Science and Numerical Simulation, 22, 943-952.

15. [15]	Bathe, K.J. and Zhang, H., (2009). A mesh adaptivity procedure for cfd and fluid-structure interactions. Computers and Structures, 87, 604-617.