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Related Experiment Video

Updated: Aug 5, 2025

Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging

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Published on: April 28, 2022

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces.

Xixing He¹, Yihe Liu¹, Haiyang Zhan¹

¹State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China.

Biomimetics (Basel, Switzerland)

|March 28, 2023

Summary

This summary is machine-generated.

Engineers developed a bionic flounder surface that reduces drag in both forward and backward flow directions. This bio-inspired design offers significant energy savings for ships and underwater vehicles.

Keywords:

bidirectional drag reduction bionic flounder two-tier structures numerical simulation

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Area of Science:

Fluid Dynamics
Biomimetics
Surface Engineering

Background:

Biological surfaces inspire skin friction drag reduction techniques.
Achieving bidirectional drag reduction with non-morphable structures remains a challenge.

Purpose of the Study:

To develop a bionic surface mimicking flounder ctenoid scales for bidirectional drag reduction.
To investigate the mechanisms behind the observed drag reduction.

Main Methods:

Fabrication of a bionic flounder two-tier structural surface (BFTSS).
Experimental testing and numerical simulations of fluid flow over the BFTSS.
Analysis of boundary layer distortion, flow separation, and pressure gradients.

Main Results:

BFTSS achieved 19% drag reduction in the forward direction.
BFTSS demonstrated 4.2% drag reduction in the backward direction.
Synergistic effects of two-tier structures (oval fins and microspikes) were identified.

Conclusions:

The BFTSS exhibits remarkable bidirectional drag reduction capabilities.
Microscale spikes' pressure gradient relief effect is key to backward drag reduction.
Potential applications include energy saving for marine vessels and pipeline transport.