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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Far field structure of turbulent shallow mixing layers between parallel
Far field structure of turbulent shallow mixing layers between parallel
In the present study, a shallow mixing layer that forms between two parallel streams that are initially separated by a thin
splitter plate is investigated using fully resolved three-dimensional time-accurate simulations. The ratio between the bulk
velocity of the two streams is equal to 2.3 and the Reynolds number defined with the mean velocity of the two streams and
the channel depth is Re=15,500. The mixing layer considered in the present study develops in a long constant-depth open
channel with a flat smooth bed. The large channel length used in the numerical simulation (400D, where D is the channel
depth) allows studying the spatial evolution of the shallow mixing layer at conditions that are close to the equilibrium
regime when the destabilizing effect of the mean shear between the two streams is compensated by the stabilizing effect
of the friction acting on the mixing layer eddies at the bed. The streamwise variation of the width of the mixing layer and
lateral displacement of the mixing layer centerline predicted by the numerical model are found to be in good agreement
with experimental results in the region where the shallow mixing layer did not start its transition toward the equilibrium
regime. The paper discusses the changes in the structure of the mixing layer with the distance from the origin based on
the streamwise variations of the turbulent kinetic energy and mean flow scalar concentration distributions in several crosssections
and in a plane situated close to the free surface.
File Size : 940,117 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 17/08/2015
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