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Drag

Drag

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,...

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Updated: Jun 29, 2025

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1

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Published on: July 11, 2017

A Bio-Inspired Drag Reduction Method of Bionic Fish Skin Mucus Structure.

Pengfei Zhao¹, Xin Li¹, Zhengjie Luo¹

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

|March 28, 2024

Summary

This summary is machine-generated.

A novel biomimetic structure inspired by fish skin mucus reduces underwater vehicle drag by 20.56%. This flexible microgroove design enhances speed and lowers energy consumption for ships and submarines.

Keywords:

bionic design drag reduction property fish skin mucus

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Area of Science:

Biomimetics and Fluid Dynamics
Materials Science for Marine Applications

Background:

Underwater vehicle efficiency is limited by drag.
Fish skin mucus provides natural drag reduction.
Novel structures mimicking biological mechanisms are needed.

Purpose of the Study:

To develop and evaluate a biomimetic mucus release structure for underwater drag reduction.
To investigate the drag reduction performance of flexible microgrooves inspired by fish skin.
To assess the reusability and adaptability of the structure under various conditions.

Main Methods:

Numerical analysis using ANSYS Fluent 19.2 for drag reduction simulation.
Experimental testing of a mucus-releasing micro-pore structure under different mechanical states (bending, tension, compression).
Biomimetic design inspired by fish skin mucus secretion.

Main Results:

A drag reduction of 20.56% was achieved when the structure was bent at 120°.
The structure effectively reduces the velocity gradient near the wall.
Drag reduction varied with different attitudes, demonstrating adaptability.

Conclusions:

The biomimetic mucus release structure offers significant drag reduction for underwater vehicles.
The flexible microgroove design is a promising approach for enhancing hydrodynamic efficiency.
The structure's reusability and adaptability support its practical application in marine engineering.