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Drag reduction using bionic groove surface for underwater vehicles.

Shihao Zheng1, Xi Liang2, Jiayong Li1

  • 1School of Civil Engineering, Tianjin University, Tianjin, China.

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|September 11, 2023
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Summary
This summary is machine-generated.

This study introduces a novel bionic groove surface inspired by killer whale skin to reduce ship drag. This innovative design significantly cuts friction and total drag, boosting energy efficiency in maritime transport.

Keywords:
biological modellingdrag reductiongroove surfacekiller whalenumerical simulation

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Area of Science:

  • Fluid Dynamics and Hydrodynamics
  • Bionic Engineering and Biomimetics
  • Naval Architecture and Marine Engineering

Background:

  • Drag reduction is critical for improving energy efficiency and reducing fuel consumption in the shipping industry.
  • Existing drag reduction methods often face limitations in effectiveness and applicability across various flow conditions.
  • The unique skin structure of marine animals, like killer whales, offers potential for novel biomimetic drag reduction strategies.

Purpose of the Study:

  • To develop and evaluate a novel non-smooth surface drag reduction method inspired by killer whale skin ridge structures.
  • To investigate the effectiveness of transverse bionic groove surfaces in reducing ship hull drag and enhancing energy efficiency.
  • To identify optimal design parameters for bionic groove surfaces for maximum drag reduction.

Main Methods:

  • Creation of transverse bionic groove surfaces mimicking killer whale skin ridges, aligned perpendicular to the flow direction.
  • Utilization of Computational Fluid Dynamics (CFD) simulations employing the Shear Stress Transport k-ω model.
  • Analysis of the impact of groove parameters (width-to-depth ratio, groove depth) and inlet velocity on drag reduction performance.

Main Results:

  • Optimal shape parameters for the bionic groove surface were determined, leading to effective drag reduction.
  • Significant drag reduction was observed within a velocity range of 2–12 m/s.
  • Achieved a friction drag reduction ratio of 26.91% and a total drag reduction ratio of 9.63%.

Conclusions:

  • The proposed transverse bionic groove surface effectively reduces drag by mitigating viscous and Reynolds stresses.
  • This biomimetic approach offers a promising solution for enhancing energy efficiency and fuel savings in maritime transportation.
  • The study validates the potential of emulating natural structures for advanced engineering applications in naval architecture.