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Related Concept Videos

Drag01:23

Drag

91
Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number,...
91
Drag Force and Terminal Speed01:18

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2.3K
An interesting force in everyday life is the force of drag on an object when it is moving in a fluid. Like friction, the drag force always opposes the motion of an object. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. For most large objects, such as cyclists, cars, and baseballs, that are not moving too...
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A bio-inspired two-stage bionic drag reduction method.

Zhengjie Luo1, Xuguang Jia1, Shining Zhu1

  • 1State Key Laboratory of Dynamic Measurement Technology, Shanxi Key Laboratory of Quantum Sensing and Precision Measurement, North University of China, Taiyuan 030051, China.

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|March 18, 2024
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Summary
This summary is machine-generated.

Mimicking loach skin, a novel biomimetic model significantly reduces underwater drag by over 21%. This innovation enhances cruising speed and mileage for underwater vehicles by optimizing surface resistance.

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Area of Science:

  • Biomimetics
  • Fluid Dynamics
  • Materials Science

Background:

  • Underwater vehicle efficiency is limited by surface resistance.
  • Loach epidermis features scales and lubricating mucus, enabling rapid movement in water.
  • Understanding loach skin structure can inspire drag reduction technologies.

Purpose of the Study:

  • To investigate the drag reduction principles of loach skin.
  • To develop and validate a biomimetic model for reducing underwater surface resistance.
  • To analyze the drag reduction mechanisms of the biomimetic structure.

Main Methods:

  • Studied loach skin morphology and structure.
  • Established a two-stage biomimetic drag reduction model.
  • Performed numerical simulations and flow channel experiments to evaluate drag reduction rates.

Main Results:

  • The biomimetic model achieved a drag reduction rate greater than 21% in simulations.
  • Experimental results showed a slightly lower but significant drag reduction rate.
  • The model demonstrated the feasibility of simulating loach skin for underwater drag reduction.

Conclusions:

  • Simulating loach skin microstructure effectively reduces underwater surface resistance.
  • The biomimetic design increases boundary layer thickness and modifies near-wall vortices.
  • This research offers technical support for drag reduction in underwater vehicles.