Experimental study of the initial growth of a localized turbulent patch in a stably stratified fluid

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Title: Experimental study of the initial growth of a localized turbulent patch in a stably stratified fluid
Author(s): Verso, L
Van Reeuwijk, M
Gurka, R
Diamessis, PJ
Taylor, ZJ
Liberzon, A
Item Type: Journal Article
Abstract: We present a laboratory experiment of the initial growth of a turbulent patch in a stably stratified fluid. The patch is created due to a localized source of turbulence, generated by a horizontally oriented and vertically oscillating grid much smaller than the tank size and far from solid boundaries. Synchronized and overlapping particle image velocimetry(PIV) and planar laser induced fluorescence (PLIF) measurements capture the evolution of the patch through its initial growth until it reached a maximum size. The simultaneous measurements of density and velocity fields allow for a direct quantification of the distribution of kinetic energy, buoyancy and degree of mixing within the patch. We can also relate the propagation speed of the turbulent/non-turbulent interface and its thickness to the properties of the turbulent fluid inside the evolving patch. The velocity measurements in this setup indicate significant transient effects inside the patch during its growth. A local analysis of the turbulent/non-turbulent interface provides direct measurements of the entrainment velocity we as compared to the local vertical velocity and turbulent intensity at the proximity of the interface. The detailed information about the growth of localized sources of turbulence in stratified environment might be of use in stealth design of autonomous underwater vehicles.
Publication Date: 13-Jun-2017
Date of Acceptance: 8-Jun-2017
URI: http://hdl.handle.net/10044/1/57443
DOI: https://dx.doi.org/10.1016/j.ijheatfluidflow.2017.06.002
ISSN: 0142-727X
Publisher: Elsevier
Start Page: 127
End Page: 136
Journal / Book Title: International Journal of Heat and Fluid Flow
Volume: 66
Copyright Statement: © 2017 Elsevier Inc. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Physical Sciences
Technology
Thermodynamics
Engineering, Mechanical
Mechanics
Engineering
Turbulent patch
Local entrainment and stable stratification
INTERNAL WAVES
BREAKING
WAKES
FLOW
EVOLUTION
COLLAPSE
REGION
SHEAR
physics.ao-ph
physics.ao-ph
Science & Technology
Physical Sciences
Technology
Thermodynamics
Engineering, Mechanical
Mechanics
Engineering
Turbulent patch
Local entrainment and stable stratification
INTERNAL WAVES
BREAKING
WAKES
FLOW
EVOLUTION
COLLAPSE
REGION
SHEAR
0901 Aerospace Engineering
0913 Mechanical Engineering
0915 Interdisciplinary Engineering
Mechanical Engineering & Transports
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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