Mean and Turbulence Properties of a Neutrally Buoyant Round Jet in a Wave Environment
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 137, Issue 3
Abstract
An experimental study of a turbulent round jet discharged into a regular wave field is presented. The particle image velocimetry (PIV) technique was employed to measure instantaneous velocity fields of the flow. Quantitative mean and turbulence properties were obtained using ensemble- and phase-averaged methods. Both the jet potential core region and self-similar region were measured. Three different wave heights were used to examine the effect of wave steepness on the jet properties. Measurements were also taken at three different phases to examine the wave phase effect. Experimental results demonstrate that the mean jet width, turbulence intensity, and Reynolds stress increased significantly when the jet was acted on by the waves. In addition, the jet mean kinetic energy decreased whereas the turbulent kinetic energy increased when the jet was under the waves, indicating an increase in turbulence. The wave phase has an insignificant effect on the both the mean and turbulence properties. The turbulent kinetic energy budget in the self-similar region at different wave conditions was also examined. It was found that the turbulent production, advection, and dissipation terms all increase with the increase of the wave height.
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Acknowledgments
The authors would like to express sincere gratitude to the National Science Council in Taiwan and the Sinotech Foundation for Research and Development of Engineering Sciences and Technology for their financial support (Grant No. NSCTNSC 99-2628-E-006-163). K. A. Chang wishes to acknowledge the support from the Japan Society for the Promotion of Science.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 137 • Issue 3 • May 2011
Pages: 109 - 122
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 8, 2010
Accepted: Sep 16, 2010
Published online: Sep 18, 2010
Published in print: May 1, 2011
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