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Unstable flow structures in the Blasius boundary layer.

H Wedin1, A Bottaro, A Hanifi

  • 1Department of Civil, Chemical and Environmental Engineering, University of Genova, Via Montallegro 1, 16145, Genova, Italy, hakanwedin@hotmail.com.

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Summary
This summary is machine-generated.

Researchers identified finite amplitude coherent structures in boundary layer flow, potentially explaining turbulence transition. These structures, resembling experimental observations, exist within the buffer layer and are unstable, offering insights into fluid dynamics.

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Area of Science:

  • Fluid Dynamics
  • Turbulence
  • Nonlinear Dynamics

Background:

  • Turbulent boundary layers are complex and challenging to model.
  • Self-sustaining processes offer a framework for understanding turbulence generation.
  • Coherent structures are key components of turbulent flows.

Purpose of the Study:

  • To search for finite amplitude coherent structures in parallel boundary layer flow.
  • To analyze the stability of these identified structures.
  • To explore their potential role in turbulent transition.

Main Methods:

  • Utilized the self-sustaining process framework by Waleffe.
  • Employed a body force in Navier-Stokes equations and nonlinear continuation.
  • Analyzed solutions for spanwise spacing, location, and stability.

Main Results:

  • Identified coherent structures with spanwise spacing matching experimental turbulence scales.
  • Structures are located in the buffer layer and exhibit a 4-vortex structure.
  • These structures are unstable to small perturbations and persist down to Re* = 496.

Conclusions:

  • The identified coherent structures are unstable nonlinear states relevant to turbulent transition.
  • These structures coexist with laminar Blasius flow at a critical Reynolds number.
  • Findings provide a potential mechanism for turbulence generation and maintenance in boundary layers.