The three-dimensional character of a nominally two-dimensional separated turbulent shear flow

1989 ◽  
Vol 205 (-1) ◽  
pp. 523 ◽  
Author(s):  
M. P. Jaroch ◽  
H.-H. Fernholz
Keyword(s):  
Shear Flow ◽  
Three Dimensional ◽  
Turbulent Shear ◽  
Two Dimensional ◽  
Turbulent Shear Flow

Numerical simulation of contaminant dispersion in estuary flows

1982 ◽  
Vol 381 (1780) ◽  
pp. 179-194 ◽  
Keyword(s):  
Numerical Simulation ◽  
Random Walk ◽  
Shear Flow ◽  
Diffusion Equation ◽  
New Method ◽  
Turbulent Shear ◽  
Two Dimensional ◽  
Turbulent Shear Flow ◽  
Oscillatory Flows ◽  
Contaminant Dispersion

The paper examines in detail the dispersion of a passive contaminant in steady and oscillatory turbulent shear flow in a two-dimensional channel. The aim of this examination is to understand dispersion in estuaries. A new method of analysing and predicting concentration distributions has been developed from work of Sullivan ( J. Fluid Mech . 49, 551–576 (1971)). A random walk technique is used, the contaminant being represented by a large number of marked particles whose paths are tracked as they move through the fluid. The technique seeks to model the physics of dispersion more realistically than the standard diffusion equation, and results from the simulation, with input based on data taken in the Mersey, show it to be a useful and versatile method of studying dispersion in oscillatory flows.

Dynamics of inviscid truncated model of two‐dimensional turbulent shear flow

1989 ◽  
Vol 1 (7) ◽  
pp. 1225-1234 ◽  
Author(s):  
Yukio Kaneda ◽  
Toshiyuki Gotoh ◽  
Naoaki Bekki
Keyword(s):  
Shear Flow ◽  
Turbulent Shear ◽  
Two Dimensional ◽  
Turbulent Shear Flow

Identification of Coherent Structure in Turbulent Shear Flow With Wavelet Correlation Analysis

1998 ◽  
Vol 120 (4) ◽  
pp. 778-785 ◽  
Author(s):  
Hui Li
Keyword(s):  
Correlation Analysis ◽  
Shear Flow ◽  
Coherent Structure ◽  
Correlation Method ◽  
New Combination ◽  
Turbulent Shear ◽  
Two Dimensional ◽  
Turbulent Shear Flow ◽  
Structure Information ◽  
Time Period

In order to identify coherent structure of turbulent shear flow, a new combination of familiar techniques of signal processing, called wavelet correlation analysis, is developed based on the wavelet transform. The wavelet correlation analysis provides the unique capability for decomposing the correlation of arbitrary signals over a two-dimensional time delay-period plane. By analyzing two superposition functions implicating several pure frequencies, the correlation of periodic oscillations at several frequencies can well be separated and observed clearly. Coherent structures in the intermediate region of a plane turbulent jet are investigated using the wavelet correlation method. It is shown that the wavelet correlation analysis can extract the most essential scales governing features of eddy motions. The coherent structure information and apparent flapping behaviors are clearly revealed over a two-dimensional time-period plane.

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