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Direct Numerical Simulation of Intermittent Turbulence Under Stably Stratified Conditions : Volume 2, Issue 1 (11/02/2015)

By He, P.

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Book Id: WPLBN0004020134
Format Type: PDF Article :
File Size: Pages 63
Reproduction Date: 2015

Title: Direct Numerical Simulation of Intermittent Turbulence Under Stably Stratified Conditions : Volume 2, Issue 1 (11/02/2015)  
Author: He, P.
Volume: Vol. 2, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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He, P., & Basu, S. (2015). Direct Numerical Simulation of Intermittent Turbulence Under Stably Stratified Conditions : Volume 2, Issue 1 (11/02/2015). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina, 27695, USA. In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified open-channel flows using direct numerical simulation. Clear signatures of this intriguing phenomenon are observed for a range of stabilities. However, the spatio-temporal characteristics of intermittency are found to be strongly stability-dependent. In general, the bursting events are much more frequent near the bottom wall than in the upper-channel region. A steady coexistence of laminar and turbulent flows is detected at various horizontal planes in very stable cases. This spatially intermittent pattern is found to propagate downstream and strongly correlate with the temporal evolution of intermittency. Last, a long standing hypothesis by Blackadar, i.e., the strong connection between local stability and intermittent turbulence, is corroborated by this modeling study.

Summary
Direct numerical simulation of intermittent turbulence under stably stratified conditions

Excerpt
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