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Related Experiment Video

Updated: May 18, 2026

Preparation of Free-Surface Hyperbolic Water Vortices

Preparation of Free-Surface Hyperbolic Water Vortices

Published on: July 28, 2023

Revival of classical vortex generators now for transition delay.

Shahab Shahinfar¹, Sohrab S Sattarzadeh, Jens H M Fransson

¹Linné Flow Centre, KTH Mechanics, Stockholm, Sweden.

Physical Review Letters

|September 26, 2012

Summary

Miniature vortex generators effectively delay turbulent transition by stabilizing laminar boundary layers. These powerful devices offer a novel approach to flow control, though they possess a significant limitation.

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Area of Science:

Fluid Dynamics
Aerodynamics
Turbulence Control

Background:

Classical vortex generators are known for delaying boundary layer separation.
Transition to turbulence is a critical phenomenon in fluid dynamics.
Controlling laminar-to-turbulent transition is essential for aerodynamic efficiency.

Purpose of the Study:

To investigate the effectiveness of miniature vortex generators in delaying transition to turbulence.
To understand the underlying physical mechanisms by which these devices modulate the boundary layer.
To identify the limitations or drawbacks of using these miniature devices.

Main Methods:

Experimental investigation of flow dynamics.
Analysis of laminar boundary layer modulation.
Examination of the perturbation energy equation.

Main Results:

Miniature vortex generators significantly delay the transition to turbulence.
These devices powerfully modulate the laminar boundary layer, creating a stabilizing effect.
An additional term in the perturbation energy equation counteracts flow destabilization.

Conclusions:

Miniature vortex generators are effective tools for delaying transition to turbulence.
The devices stabilize the flow by altering the energy dynamics within the boundary layer.
Despite their effectiveness, these miniature vortex generators have a critical limitation or 'Achilles' heel'.