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Engineered bio-inspired coating for passive flow control.

Humberto Bocanegra Evans1, Ali M Hamed2, Serdar Gorumlu3

  • 1Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409; humberto.bocanegra@ttu.edu.

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Summary
This summary is machine-generated.

An engineered coating with diverging cylindrical pillars effectively reduces the size of flow separation bubbles. This innovative surface treatment modifies recirculation zones without increasing near-wall turbulence, offering broad applications.

Keywords:
adverse pressure gradientbio-inspired surfaceengineered surfaceflow controlflow separation

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Area of Science:

  • Fluid dynamics
  • Surface engineering
  • Aerodynamics

Background:

  • Flow separation and vortex shedding are common in bluff body aerodynamics.
  • Recirculation bubbles reduce efficiency and increase structural loading.
  • Controlling these phenomena is crucial for engineering applications.

Purpose of the Study:

  • To investigate an engineered coating's ability to manipulate large-scale recirculation regions in separated flows.
  • To assess the coating's effectiveness at a moderate momentum thickness Reynolds number.
  • To understand the underlying mechanism of bubble modulation.

Main Methods:

  • Experimental testing of a novel coating composed of cylindrical pillars with diverging tips.
  • Analysis of flow separation bubble size and position.
  • Measurement of near-wall turbulence levels.
  • Theoretical analysis using averaged equations of motion.

Main Results:

  • The engineered coating successfully reduced the size of the separation bubble and shifted it downstream.
  • The coating operated effectively within the hydrodynamic smooth regime.
  • No significant increase in near-wall turbulence levels was observed.
  • The mechanism was attributed to unsteady suction and blowing induced by the pillar tip geometry.

Conclusions:

  • The engineered coating effectively manipulates separated flow recirculation.
  • The mechanism relies on passive, geometry-driven unsteady fluid dynamics.
  • The coating is easily fabricated, installable, and functional in various conditions, indicating high application potential.