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Updated: Apr 30, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
Published on: February 3, 2014
Complexity of localised coherent structures in a boundary-layer flow.
Taras Khapko1, Yohann Duguet, Tobias Kreilos
1KTH Mechanics, Linné FLOW Centre, Osquars Backe 18, SE-100 44, Stockholm, Sweden, taras@mech.kth.se.
We numerically investigated transitional coherent structures in asymptotic suction boundary layers (ASBL). Edge states exhibit complex dynamics, multistability, and bifurcations from periodic to chaotic regimes.
Area of Science:
- Fluid Dynamics
- Turbulence Transition
- Nonlinear Dynamics
Background:
- Boundary-layer flows are fundamental in fluid dynamics.
- Understanding the transition from laminar to turbulent flow is crucial.
- Asymptotic suction boundary layers (ASBL) offer a unique system for studying flow stability.
Purpose of the Study:
- To numerically investigate transitional coherent structures in ASBL.
- To analyze the dynamics of edge states on the laminar-turbulent separatrix.
- To explore the influence of streamwise period on edge state behavior.
Main Methods:
- Numerical simulations of boundary-layer flow.
- Utilizing a spanwise-extended domain for edge state localization.
- Analyzing edge states at a fixed Reynolds number across varying streamwise periods.
Main Results:
- Demonstrated complex spatio-temporal dynamics of localized edge states.
- Observed multistability and complex bifurcations in edge state behavior.
- Identified transitions from periodic to chaotic regimes.
Conclusions:
- Edge state dynamics in ASBL are inherently low-dimensional and non-extensive.
- The study provides insights into the fundamental mechanisms of turbulence generation.
- Findings contribute to the understanding of transitional fluid flows.
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