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Related Experiment Video

Updated: May 24, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

Self-sustained localized structures in a boundary-layer flow.

Yohann Duguet¹, Philipp Schlatter, Dan S Henningson

¹LIMSI-CNRS, UPR 3251, F-91403 Orsay, France.

Physical Review Letters

|March 10, 2012

Summary

This summary is machine-generated.

Large disturbances trigger turbulence in developing boundary layers. A study of Blasius flow reveals localized structures with low-speed streaks spawning hairpin vortices, explaining transitional dynamics.

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Last Updated: May 24, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

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Published on: February 22, 2018

Area of Science:

Fluid dynamics
Turbulence research
Boundary layer theory

Background:

Turbulence transition in boundary layers is often triggered by large amplitude disturbances.
Understanding the dynamics of subcritical transition is crucial for predicting flow behavior.

Purpose of the Study:

To investigate the spatial development of disturbances in the Blasius boundary layer.
To identify the mechanisms responsible for turbulence generation in the transitional regime.

Main Methods:

Direct numerical simulation (DNS) of the Blasius boundary-layer flow.
Analysis of phase space dynamics separating transitional and relaminarizing trajectories.
Application of dynamical rescaling with local boundary-layer thickness.

Main Results:

Identified a localized disturbance regime between transitional and relaminarizing flows.
Observed low-speed streaks as dominant structures within this regime.
Demonstrated that convective instabilities of streaks spawn hairpin vortices, leading to transient disturbances.

Conclusions:

The study elucidates a quasicyclic mechanism for the generation of turbulent disturbances.
Low-speed streaks play a critical role in the initial stages of turbulence generation in boundary layers.
The findings contribute to a deeper understanding of subcritical turbulence transition.