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Related Experiment Video

Updated: Jun 2, 2026

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Published on: April 23, 2018

Laminar superlayer at the turbulence boundary.

M Holzner¹, B Lüthi

¹Max Planck Institute for Dynamics and Self-Organisation, Bunsenstrasse 10, 37073 Göttingen, Germany. markus.holzner@ds.mpg.de

Physical Review Letters

|April 27, 2011

Summary

This study confirms the existence of a laminar superlayer, crucial for understanding turbulence spreading. Its viscous nature and interaction with large scales govern mass and momentum mixing in various fluid flows.

Area of Science:

Fluid Dynamics
Turbulence Research

Background:

The concept of a laminar superlayer was first proposed by Corrsin and Kistler in 1955.
Understanding turbulence spreading is key to many geophysical and engineering applications.

Purpose of the Study:

To present evidence supporting the existence of a laminar superlayer.
To investigate the velocity characteristics and implications of this superlayer on turbulence dynamics.

Main Methods:

Particle Tracking Velocimetry (PTV)
Direct Numerical Simulation (DNS)

Main Results:

Results are congruent with the existence of a laminar superlayer.
Local superlayer velocity is primarily viscous and comparable to the smallest scales of motion.

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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

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Global turbulence spreading is dictated by the largest scales of motion.

Conclusions:

The findings support the laminar superlayer theory and its role in fluid dynamics.
This research enhances understanding of mass and momentum mixing in shear flows.
Applicable to boundary layers, clouds, planetary atmospheres, and oceans.