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Effect of head swing motion on hydrodynamic performance of fishlike robot propulsion

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Abstract

This paper studies the effect of the head swing motion on the fishlike robot swimming performance numerically. Two critical parameters are employed in describing the kinematics of the head swing: the leading edge amplitude of the head and the trailing edge amplitude of the head. Three-dimensional Navier-Stokes equations are used to compute the viscous flow over the robot. The user-defined functions and the dynamic mesh technology are used to simulate the fishlike swimming with the head swing motion. The results reveal that it is of great benefit for the fish to improve the thrust and also the propulsive efficiency by increasing the two amplitudes properly. Superior hydrodynamic performance can be achieved at the leading edge amplitudes of 0.05L (L is the fish length) and the trailing edge amplitudes of 0.08L. The unsteady flow fields clearly indicate the evolution process of the flow structures along the swimming fish. Thrust-indicative flow structures with two pairs of pressure cores in a uniform mode are generated in the superior performance case with an appropriate head swing, rather than with one pair of pressure cores in the case of no head swing. The findings suggest that the swimming biological device design may improve its hydrodynamic performance through the head swing motion.

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Authors and Affiliations

  1. School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

    Dan Xia  (夏丹) & Wei-shan Chen  (陈维山)

  2. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, China

    Jun-kao Liu  (刘军考) & Ze Wu  (吴泽)

Authors
  1. Dan Xia  (夏丹)
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  2. Wei-shan Chen  (陈维山)
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  3. Jun-kao Liu  (刘军考)
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  4. Ze Wu  (吴泽)
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Corresponding author

Correspondence to Dan Xia  (夏丹).

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51205060, 51405080).

Biography: Dan XIA (1982-), Male, Ph. D., Associate Professor

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Xia, D., Chen, Ws., Liu, Jk. et al. Effect of head swing motion on hydrodynamic performance of fishlike robot propulsion. J Hydrodyn 28, 637–647 (2016). https://doi.org/10.1016/S1001-6058(16)60668-6

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  • DOI: https://doi.org/10.1016/S1001-6058(16)60668-6

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