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Drag Reduction by Fish-Scale Inspired Transverse Asymmetric Triangular Riblets: Modelling, Preliminary Experimental
Benjamin W Hamilton1,2, O Remus Tutunea-Fatan1,2, Evgueni V Bordatchev2,1
1Department of Mechanical and Materials Engineering, Western University, London, ON N6A 6B9, Canada.
Biomimetics (Basel, Switzerland)
|July 28, 2023
Summary
This study reveals that fish-scale-inspired surfaces reduce drag and resist fouling by delaying turbulence. Biomimetic designs show significant drag reduction at low Reynolds numbers, offering potential for engineering applications.
Area of Science:
- Biomimetics and Surface Engineering
- Fluid Dynamics and Hydrodynamics
Background:
- Natural surfaces exhibit self-cleaning properties, inspiring biomimetic solutions for fouling resistance.
- Drag reduction is a key mechanism for fouling resistance in underwater environments.
Purpose of the Study:
- To investigate the drag reduction mechanism responsible for fouling resistance in underwater surfaces.
- To develop and validate a fish-scale-inspired microstructure for drag reduction.
Main Methods:
- Large Eddy simulations were performed across various Reynolds numbers (Re).
- Experimental validation was conducted using pressure drop measurements in a micro-channel.
Main Results:
- A peak drag reduction of 6.7% was observed at Re = 1750 via simulation.
- Experimental validation showed a peak drag reduction of 4.8% at Re = 1000.
- Results indicate good agreement between numerical and experimental data.
Conclusions:
- Fish-scale-inspired microstructures effectively reduce drag, particularly at low Reynolds numbers.
- The primary mechanism for drag reduction is the delay in transition to turbulence.
- Performance declines as flow conditions become more turbulent.
