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Related Experiment Video

Updated: Apr 27, 2026

A Rapid Method for Modeling a Variable Cycle Engine

A Rapid Method for Modeling a Variable Cycle Engine

Published on: August 13, 2019

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

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.