An Experimental Study of the Velocity Field of Turbulent Spots in Plane Poiseuille Flow

1989 ◽  
pp. 9-14 ◽  
Author(s):  
B. G. B. Klingmann ◽  
P. H. Alfredsson ◽  
D. S. Henningson
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Poiseuille Flow ◽  
Plane Poiseuille Flow ◽  
Turbulent Spots

Turbulent spots in plane Poiseuille flow–flow visualization

1986 ◽  
Vol 29 (4) ◽  
pp. 1328 ◽  
Author(s):  
Farid Alavyoon ◽  
Dan S. Henningson ◽  
P. Henrik Alfredsson
Keyword(s):  
Flow Visualization ◽  
Poiseuille Flow ◽  
Plane Poiseuille Flow ◽  
Turbulent Spots

The wave structure of turbulent spots in plane Poiseuille flow

1987 ◽  
Vol 178 ◽  
pp. 405-421 ◽  
Author(s):  
Dan S. Henningson ◽  
P. Henrik Alfredsson
Keyword(s):  
Poiseuille Flow ◽  
Wave Structure ◽  
Amplitude Distribution ◽  
Streamwise Velocity ◽  
Plane Poiseuille Flow ◽  
Turbulent Spots ◽  
Measured Velocity ◽  
Symmetry Properties ◽  
Tollmien Schlichting ◽  
The Waves

The wave packets located at the wingtips of turbulent spots in plane Poiseuille flow have been investigated by hot-film anemometry. The streamwise velocity disturbances associated with the waves were found to be antisymmetric with respect to the channel centreline. The amplitude of the waves had a maximum close to the wall that was about 4% of the centreline velocity. The modified velocity field outside the spot was measured and linear stability analysis of the measured velocity profiles showed that the flow field was less stable than the undisturbed flow. The phase velocity and amplitude distribution of the waves were in reasonable agreement with the theory, which together with the symmetry properties indicate that the wave packet consisted of the locally least stable Tollmien-Schlichting mode.

A note on disturbances in slightly supercritical plane Poiseuille flow

1967 ◽  
Vol 30 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Christopher K. W. Tam
Keyword(s):  
Asymptotic Solution ◽  
Poiseuille Flow ◽  
Initial Value Problem ◽  
Large Time ◽  
Plane Poiseuille Flow ◽  
Initial Value ◽  
Turbulent Spots ◽  
Supercritical Flow ◽  
Characteristic Features

The evolution of disturbances after a laminar, slightly supercritical flow between parallel planes is disturbed is considered as an initial-value problem. An asymptotic solution of the disturbances for large time possesses the same characteristic features as the turbulent spots observed by Emmons (1951).

EXPERIMENTAL STUDY OF DRIFT OBJECTS USING SPATIOTEMPORAL DATA UNDER COMPLEX VELOCITY FIELD

2020 ◽  
Vol 76 (2) ◽  
pp. I_313-I_318
Author(s):  
Yu CHIDA ◽  
Nobuki FUKUI ◽  
Nobuhito MORI ◽  
Tomohiro YASUDA ◽  
Takashi YAMAMOTO
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Spatiotemporal Data ◽  
Complex Velocity
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