Abstract
Dynamic responses of a two-dimensional (2D) perimeter-reinforced (PR) membrane wing in laminar viscous flows are investigated numerically. The 2D Navier–Stokes equations and a one-dimensional nonlinear equation for membrane vibration are coupled to describe the flow-induced vibrations of the membrane wing in laminar flows. The modified characteristic-based split scheme, Galerkin finite element method, spring analogy technique and loosely coupled partitioned approach are employed, respectively, for the flow simulation, computation of the membrane response, mesh movement of the flow domain and fluid–structure interaction. The accuracy and stability of the proposed numerical method and corresponding codes are validated using a benchmark model of fluid–membrane interaction. Finally, the bifurcation characteristics of the membrane dynamic response and vortex structure near the membrane wing with respect to the angle of attack, Reynolds number, rigidity and pre-strain are analysed in detail. This paper could give people more information about the dynamic behaviours of the PR membrane wing in the laminar flow regime.
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Abbreviations
- \(\alpha \) :
-
Angle of attack
- c :
-
Chord length
- \(C_\mathrm{d} \) :
-
Structural damping normalized by \(u_\infty \)
- \(\bar{C}_{L}\) :
-
Mean lift coefficient
- \(\bar{C}_{D}\) :
-
Mean drag coefficient
- \(\bar{C}_{p}\) :
-
Mean pressure coefficient, \(\bar{C}_{p} =2\bar{p}\)
- \(\delta _0 \) :
-
Membrane pre-strain
- \(\Delta p\) :
-
Pressure difference between the lower and upper surfaces of the flexible membrane normalized by \(\rho _\infty u_\infty ^2 \)
- \(\xi \) :
-
Local coordinate on the flexible membrane normalized by c
- E :
-
Elastic modulus of the membrane normalized by \(\rho _\infty u_\infty ^2 \)
- \(f_\mathrm{D}\) :
-
Structural damping force per unit area normalized by \(\rho _\infty u_\infty ^2 \)
- h :
-
Membrane thickness normalized by c
- L :
-
Length of the flexible membrane before deforming
- \({L}'\) :
-
Length of the flexible membrane before deforming normalized by c
- \(L_\mathrm{S}\) :
-
Length of the flexible membrane after deforming normalized by c
- \(\overline{L/D}\) :
-
Mean lift-to-drag ratio
- \(n_\mathrm{P}\) :
-
Total number of grid nodes in the flow domain
- \(n_\mathrm{E}\) :
-
Total number of grid elements in the flow domain
- \(n_\mathrm{M}\) :
-
Total number of grid elements on the flexible membrane
- p :
-
Pressure normalized by \(\rho _\infty u_\infty ^2 \)
- \(\bar{p}\) :
-
Mean pressure normalized by \(\rho _\infty u_\infty ^2 \)
- \(p^{+},p^{-}\) :
-
Pressures on the upper and lower surfaces of the flexible membrane normalized by \(\rho _\infty u_\infty ^2 \)
- Re :
-
Reynolds number with respect to c and \(u_\infty \)
- \(\rho _\infty \) :
-
Density of the incompressible flow
- \(\rho _\mathrm{S} \) :
-
Density of the flexible membrane normalized by \(\rho _\infty \)
- t :
-
Real time normalized by \(c/{u_\infty }\)
- T :
-
Tension of the flexible membrane normalized by \({\rho _\infty u_\infty ^2 }/c\)
- \(u_\infty \) :
-
Velocity component of the free stream in x direction
- \(u_i\) :
-
Velocity components of the flow field by \(u_\infty \)
- v :
-
Membrane velocity normalized by \(u_\infty \)
- x, y :
-
Coordinate components of the flow domain normalized by c
- z :
-
Membrane displacement normalized by c
- \(z_\mathrm{mean}\) :
-
Time-averaged displacement of the membrane normalized by c
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Acknowledgements
This work is supported by Science Foundation of China University of Petroleum-Beijing (No. 01JB0303) and the National Natural Science Foundation of China (No. 51506224). The author would like to thank for the kindly support of these foundations.
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Sun, X., Ren, XL. & Zhang, JZ. Nonlinear dynamic responses of a perimeter-reinforced membrane wing in laminar flows. Nonlinear Dyn 88, 749–776 (2017). https://doi.org/10.1007/s11071-016-3274-3
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DOI: https://doi.org/10.1007/s11071-016-3274-3