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Unsteady Flow Separation and High Performance of Airfoil with Local Flexible Structure at Low Reynolds Number

Published online by Cambridge University Press:  03 June 2015

Peng-Fei Lei ,
Jia-Zhong Zhang ,
Wei Kang ,
Sheng Ren  and
Le Wang
Peng-Fei Lei*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Jia-Zhong Zhang*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Wei Kang*
Affiliation:
School of Astronaustics, Northwestern Polytechnical University, Xi’an 710072, P.R. China
Sheng Ren*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Le Wang*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
*
Corresponding author.Email:[email protected]
Email:[email protected]
Email:[email protected]
Email:[email protected]
Email:[email protected]
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Abstract

The unsteady flow separation of airfoil with a local flexible structure (LFS) is studied numerically in Lagrangian frames in detail, in order to investigate the nature of its high aerodynamic performance. For such aeroelastic system, the characteristic-based split (CBS) scheme combined with arbitrary Lagrangian-Eulerian (ALE) framework is developed firstly for the numerical analysis of unsteady flow, and Galerkin method is used to approach the flexible structure. The local flexible skin of airfoil, which can lead to self-induced oscillations, is considered as unsteady perturbation to the flow. Then, the ensuing high aerodynamic performances and complex unsteady flow separation at low Reynolds number are studied by Lagrangian coherent structures (LCSs). The results show that the LFS has a significant influence on the unsteady flow separation, which is the key point for the lift enhancement. Specifically, the oscillations of the LFS can induce the generations of moving separation and vortex, which can enhance the kinetic energy transport from main flow to the boundary layer. The results could give a deep understand of the dynamics in unsteady flow separation and flow control for the flow over airfoil.

Keywords

74F1076G2576D5576D05Unsteady flowmoving separationaeroelastic structurelift enhancementLagrangian coherent structures
Type
Research Article
Information
Communications in Computational Physics , Volume 16 , Issue 3 , September 2014 , pp. 699 - 717
Copyright
Copyright © Global Science Press Limited 2014

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References

[1]Gordnier, R. E., High fidelity computational simulation of a membrane wing airfoil, Journal of Fluids and Structures, 25(2009), 897–917.Google Scholar
[2]Rojratsirikul, P., Wang, Z., and Gursul, I., Unsteady aerodynamics of membrane wing airfoil, AIAA Paper, 2008–0613.Google Scholar
[3]Chakravarty, U. K. and Albertani, R., Experimental and finite element modal analysis of a pliant elastic membrane for micro air vehicles applications, Journal of Applied Mechanics, 79(2012), 021004.Google Scholar
[4]Zingg, D. W., Diosady, L., and Billing, L., Adaptive airfoils for drag reduction at transonic speeds, AIAA Paper, 2006–3656.Google Scholar
[5]Pern, N. J. and Jacob, J. D., Wake vortex mitigation using adaptive airfoils - The Piezoelectric Arc Airfoil, AIAA Paper, 1999–0524.Google Scholar
[6]Chimakurthi, S. K., Tang, J., Palacios, R., Cesnik, C. E. S., and Shyy, W., Computational aeroelasticity framework for analyzing flapping wing micro air vehicles, AIAA Journal, 47(2009), 1865–1878.Google Scholar
[7]Lee, K. B.,. Kim, J. H., and Kim, C., Aerodynamic effects of structural flexibility in two-dimensional insect flapping flight, Journal of Aircraft, 48(2011), 894–909.CrossRefGoogle Scholar
[8]Kang, W., Zhang, J. Z., and Feng, P. H., Aerodynamic analysis of a localized flexible airfoil at low Reynolds numbers, Communications in Computational Physics, 11(2012), 1300–1310.Google Scholar
[9]Sears, W. R., and Telionis, D. P., Boundary-layer separation in unsteady flow, SIAM Journal on Applied Mathematics, 28(1975), 215–235.Google Scholar
[10]Dommelen, L. L. Van and Cowley, S. J., On the Lagrangian description of unsteady boundary layer separation, part 1. General Theory, Journal of Fluid Mechanics, 210(1990), 593–626.Google Scholar
[11]Duan, J. and Wiggins, S., Lagrangian transport and chaos in the near wake of the flow around an obstacle: a numerical implementation of lobe dynamics, Nonlinear Processes in Geophysics, 4(1997), 125–136.Google Scholar
[12]Haller, G. and Yuan, G., Lagrangian coherent structures and mixing in two-dimensional turbulence, Physica D, 147(2000), 352–370.CrossRefGoogle Scholar
[13]Haller, G., Exact theory of unsteady separation for two-dimensional flows, Journal of Fluid Mechanics, 512(2005), 257–311.Google Scholar
[14]Surana, A. and Haller, G., Ghost manifolds in slow-fast systems, with applications to unsteady fluid flow separation, Physica D: Nonlinear Phenomena, 237(2008), 1507–1529.Google Scholar
[15]Lipinski, D., Cardwell, B., and Mohseni, K., A Lagrangian analysis of a two-dimensional airfoil with vortex shedding, Journal of Physics A: Mathematical and Theoretical, 41(2008), 344011.Google Scholar
[16]Beron-Vera, F. J., Olascoaga, M. J., and Goni, G. J., Oceanic mesoscale eddies as revealed by Lagrangian coherent structures, Geophysical Research Letters, 35(2008), L12603.Google Scholar
[17]BozorgMagham, A. E., Ross, S. D., and Schmale, D. G., Real-time prediction of atmospheric Lagrangian coherent structures based on forecast data: an application and error analysis, Physica D: Nonlinear Phenomena, 258(2013), 47–60.Google Scholar
[18]Mathur, M., Haller, G., Peacock, T., Ruppert-Felsot, J., and Swinney, H., Uncovering the Lagrangian skeleton of turbulence, Physical Review Letters, 98(2007), 144502.Google Scholar
[19]Green, M. A., Rowley, C. W., and Haller, G., Detection of Lagrangian coherent structures in three-dimensional turbulence, Journal of Fluid Mechanics, 572(2007), 111–120.Google Scholar
[20]Weldon, M., Peacock, T., Jacobs, G. B., Helu, M., and Haller, G., Experimental and numerical investigation of the kinematic theory of unsteady separation, Journal of Fluid Mechanics, 611(2008), 1–11.Google Scholar
[21]Haller, G., Finding finite-time invariant manifolds in two-dimensional velocity fields, Chaos, 10(2000), 99–108.CrossRefGoogle ScholarPubMed
[22]Shadden, S. C., Lekien, F., and Marsden, J. E., Definition and properties of Lagrangian coherent structures from finite-time Lyapunov exponents in two-dimensional aperiodic flows, Physica D: Nonlinear Phenomena, 212(2005), 271–304.Google Scholar
[23]Lipinski, D. and Mohseni, K., A ridge tracking algorithm and error estimate for efficient computation of Lagrangian coherent structures, Chaos: An Interdisciplinary Journal of Nonlinear Science, 20(2010), 017504.Google Scholar
[24]Haller, G., A variational theory of hyperbolic Lagrangian coherent structures, Physica D: Nonlinear Phenomena, 240(2011), 574–598.CrossRefGoogle Scholar
[25]Kjellgren, P. and Hyvarinen, J., An arbitrary Lagrangian-Eulerian finite element method, Computational Mechanics, 21(1998), 81–90.Google Scholar
[26]Sarrate, J., Huerta, A., and Donea, J., Arbitrary Lagrangian-Eulerian formulation for fluid-rigid body interaction, Computer Methods in Applied Mechanics and Engineering, 190(2001), 3171–3188,.Google Scholar
[27]Batina, J. T., Unsteady Euler airfoil solutions using unstructured dynamic mesh, AIAA Journal, 28(1990), 1381–1388.Google Scholar
[28]Nithiarasu, P., A fully explicit characteristic based split (CBS) scheme for viscoelastic flow calculations, International Journal for Numerical Methods in Engineering, 60(2004), 949–978.Google Scholar
[29]Wang, Y. T. and Zhang, J. Z., An improved ALE and CBS-based finite element algorithm for analyzing flows around forced oscillating bodies, Finite Elements in Analysis and Design, 47(2011), 1058–1065.Google Scholar
[30]Zhang, J. Z. and Campen, D. H. van, Stability and bifurcation of doubly curved shallow panels under quasistatic uniform load, International Journal of Non-linear Mechanics, 38(2003), 457–466.Google Scholar
[31]Zhang, J. Z., Liu, Y., Lei, P. F., and Sun, X., 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 and Algorithms, 14(2007), 287–291.Google Scholar