Computation of unsteady viscous flow around a locally flexible airfoil at low Reynolds number |
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| Affiliation: | 1. School of Astronautics, Northwestern Polytechnical University, Xi''an, Shaanxi Province 710072, PR China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi Province 710049, PR China;1. Energy Research Institute at NTU, Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798, Singapore;2. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;4. Energy Research Institute at NTU, Nanyang Technological University, Singapore 639798, Singapore;1. Mechanical Engineering, Faculty of Engineering, Yasouj University, Yasouj, 75918-74831, Iran;2. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran |
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| Abstract: | A numerical method for fluid–structure interaction is presented for the analysis of unsteady viscous flow over a locally flexible airfoil. The Navier–Stokes equations are solved by ALE–CBS algorithm, coupling with a structural solver with large deformation. Following the validation of the method, a numerical example for the flight of micro-air vehicles at low Reynolds number is chosen for the computation. The coupling effect of flexible structure with different elastic stiffness on aerodynamic performance is demonstrated. A noticeable camber effect is induced by the deflection of the structure as the elastic stiffness of the structure goes smaller. Moreover, when the vibrating frequencies of the structure with smaller elastic stiffness have a close correlation with the shedding frequencies, the positive impact of the vibration of local flexible surface on the lift of the airfoil is highlighted, which results from the formation of the coherent vortices. |
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| Keywords: | Fluid–structure interaction Thin-walled structure Aeroelasticity Airfoil Lift enhancement |
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