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Related Experiment Video

Updated: Apr 27, 2026

A Rapid Method for Modeling a Variable Cycle Engine
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Consecutive turbulence transition delay with reinforced passive control.

Sohrab S Sattarzadeh1, Jens H M Fransson1, Alessandro Talamelli2

  • 1Linné Flow Centre, KTH Royal Institue of Technology, SE-10044 Stockholm, Sweden.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
PubMed
Summary

Using a second array of miniature vortex generators (MVGs) prolongs laminar flow control, delaying turbulence transition and achieving over 65% skin-friction drag reduction.

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Area of Science:

  • Fluid dynamics
  • Aerodynamics
  • Boundary layer theory

Background:

  • Miniature vortex generators (MVGs) can delay turbulence transition in flat plate boundary layers.
  • The laminar control effect of single-array MVGs diminishes rapidly due to exponential flow recovery.

Purpose of the Study:

  • To investigate the efficacy of a dual-array MVG system for sustained laminar flow control.
  • To enhance the streamwise extent and effectiveness of laminar flow control.
  • To achieve significant skin-friction drag reduction.

Main Methods:

  • Implementation of a second array of MVGs downstream of an initial array.
  • Analysis of the interaction and reinforcement of counter-rotating streamwise vortices.
  • Experimental or computational fluid dynamics (CFD) investigation of the modulated boundary layer flow.

Main Results:

  • The second MVG array successfully nourishes the streamwise vortices, extending the laminar control.
  • The dual-array system significantly prolongs the streamwise region of laminar flow.
  • A net skin-friction drag reduction exceeding 65% was demonstrated.

Conclusions:

  • A dual-array MVG strategy offers a viable method for prolonged laminar flow control.
  • This approach effectively overcomes the rapid decay of passive laminar control.
  • Significant aerodynamic drag reduction is achievable through this enhanced vortex generation technique.