Abstract
The flapping motion of a flexible propulsor near the ground was simulated using the immersed boundary method. The hydrodynamic benefits of the propulsor near the ground were explored by varying the heaving frequency (St) of the leading edge of the flexible propulsor. Propulsion near the ground had some advantages in generating thrust and propelling faster than propulsion away from the ground. The mode analysis and flapping amplitude along the Lagrangian coordinate were examined to analyze the kinematics as a function of the ground proximity (d) and St. The trailing edge amplitude (\(a_\mathrm{tail}\)) and the net thrust (\(\overline{{F}}_x\)) were influenced by St of the flexible propulsor. The vortical structures in the wake were analyzed for different flapping conditions.












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References
Webb, P.W.: The effect of solid and porous channel walls on steady swimming of steelhead trout Oncorhynchus mykiss. J. Exp. Biol. 178, 97–108 (1993)
Blake, R.W.: The energetics of hovering in the mandarin fish (synchropus picturatus). J. Exp. Biol. 82, 25–33 (1979)
Baudinette, R.V., Schmidt-Nielsen, K.: Energy cost of gliding flight in herring gulls. Nature 248, 83–84 (1974)
Rayner, J.M.V.: On the aerodynamics of animal flight in ground effect. Philos. Trans. R. Soc. B 334, 119–128 (1991)
Blake, R.W.: Mechanics of gliding birds with special reference to the influence of ground effect. J. Biomech. 16, 649–654 (1983)
Hainsworth, F.R.: Induced drag savings from ground effect and formation flight in brown pelicans. J. Exp. Biol. 135, 431–444 (1988)
Nowroozi, B.N., Strother, J.A., Horton, J.M., et al.: Whole-body lift and ground effect during pectoral fin locomotion in the northern spearnose poacher ( agonopsis vulsa). J. Zool. 112, 393–402 (2009)
Park, H., Choi, H.: Aerodynamic characteristics of flying fish in gliding flight. J. Exp. Biol. 213, 3269–3279 (2010)
Tanida, Y.: Ground effect in flight. JSME Int. J. Ser. B. 44, 481–486 (2001)
Truong, T.V., Byun, D., Kim, M.J., et al.: Aerodynamic forces and flow structures of the leading edge vortex on a flapping wing considering ground effect. Bioinspiration Biomim. 8, 036007 (2013)
Blevins, E., Lauder, G.V.: Swimming near the substrate: a simple robotic model of stingray locomotion. Bioinspiration Biomim. 8, 016005 (2013)
Iosilevskii, G.: Asymptotic theory of an oscillating wing section in weak ground effect. Eur. J. Mech. B/Fluids 27, 477–490 (2008)
Quinn, D.B., Lauder, G.V., Smits, A.J.: Flexible propulsors in ground effect. Bioinspiration Biomim. 9, 036008 (2014)
Peskin, C.S.: The immersed boundary method. Acta Numer. 11, 479–517 (2002)
Zhu, L., Peskin, C.S.: Simulation of a flapping flexible filament in a flowing soap film by the immersed boundary method. J. Comput. Phys. 179, 452–468 (2002)
Kim, Y., Peskin, C.S.: Penalty immersed boundary method for an elastic boundary with mass. Phys. Fluids 19, 053103 (2007)
Huang, W.-X., Shin, S.J., Sung, H.J.: Simulation of flexible filaments in a uniform flow by the immersed boundary method. J. Comput. Phys. 226, 2206–2228 (2007)
Huang, W.-X., Sung, H.J.: An immersed boundary method for fluid-flexible structure interaction. Comput. Methods Appl. Mech. Eng. 198, 2650–2661 (2009)
Zhong, G., Sun, X.: New simulation strategy for an oscillating cascade in turbomachinery using immersed-boundary method. J. Propul. Power 25, 312–321 (2009)
Kim, S., Huang, W.-X., Sung, H.J.: Constructive and destructive interaction modes between two tandem flexible flags in viscous flow. J. Fluid Mech. 661, 511–521 (2010)
Uddin, E., Huang, W.-X., Sung, H.J.: Interaction modes of multiple flexible flags in a uniform flow. J. Fluid Mech. 729, 563–583 (2013)
Uddin, E., Huang, W.-X., Sung, H.J.: Actively flapping tandem flexible flags in a viscous flow. J. Fluid Mech. 780, 120–142 (2015)
Zhu, X., He, G., Zhang, X.: Numerical study on hydrodynamic effect of flexibility in a self-propelled plunging foil. Comput. Fluids 97, 1–20 (2014)
Zhu, X., He, G., Zhang, X.: Flow-mediated interactions between two self-propelled flapping filaments in tandem configuration. Phys. Rev. Lett. 113, 238105 (2014)
Liao, C.-C., Lin, C.-A.: Simulation of natural and forced convection flows with moving embedded object using immersed boundary method. Comput. Methods Appl. Mech. Eng. 213–216, 58–70 (2012)
Liu, Y.Z., Kang, W., Sung, H.J.: Assessment of the organization of a turbulent separated and reattaching flow by measuring wall pressure fluctuations. Exp. Fluids 38, 485–493 (2005)
Nagendra, K., Tafti, D.K., Viswanath, K.: A new approach for conjugate heat transfer problems using immersed boundary method for curvilinear grid based solvers. J. Comput. Phys. 267, 225–246 (2014)
Shin, S.J., Huang, W.-X., Sung, H.J.: Assessment of regularized delta functions and feedback forcing schemes for an immersed boundary method. Int. J. Numer. Methods Fluids 58, 263–286 (2008)
Kim, K., Baek, S.-J., Sung, H.J.: An implicit velocity decoupling procedure for incompressible Navier-Stokes equations. Int. J. Numer. Methods Fluids 38, 125–138 (2002)
Quinn, D.B., Lauder, G.V., Smits, A.J.: Scaling the propulsive performance of heaving flexible panels. J. Fluid Mech. 738, 250–267 (2014)
Park, T.S., Sung, H.J.: Development of a near-wall turbulence model and application to jet impingement heat transfer. Int. J. Heat Fluid Fl. 22, 10–18 (2001)
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This work was supported by the Creative Research Initiatives (Grant 2016-004749) program of the National Research Foundation of Korea (MSIP).
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Ryu, J., Park, S.G., Kim, B. et al. Flapping dynamics of a flexible propulsor near ground. Acta Mech. Sin. 32, 991–1000 (2016). https://doi.org/10.1007/s10409-016-0571-5
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DOI: https://doi.org/10.1007/s10409-016-0571-5