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Open AccessArticle

Direct Numerical Simulations on Jets during the Propagation and Break down of Internal Solitary Waves on a Slope

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State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
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College of water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
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School of Engineering and Material, Queen Mary University of London, London E1 4NS, UK
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 671; https://doi.org/10.3390/w12030671
Received: 14 February 2020 / Accepted: 26 February 2020 / Published: 1 March 2020
(This article belongs to the Section Hydraulics)
Jet flows often have an important role in the water environment. The aim of this research is to study the dilution of jets due to complex velocity fields induced by internal solitary waves in stratified water. Direct numerical simulations are used to study vertical jet flows during the propagation and breaking of internal solitary waves (ISWs) with elevation type on a slope. Energy analysis shows that the internal interface is able to absorb kinetic energy from the jet and that for Re < 10,000 with Ri > 3.7, the ISWs can stay stable during the propagation within the presence of jet flows. The vortices jointly induced by the jets and the ISWs are observed at the bottom behind the ISW’s crest. The transport of the jet’s emitted scalar by the ISWs can be divided into two parts; some is transported by the moving interface and the rest by the bottom vortices. The ultimate transport length scales of two types are defined, and it is found that when the center of the jet inlet approaches the slope, the extension of the bottom vortices into the slope will lead to strong mixing. That causes increasing scalar concentration over the slope of the scalar that originated from the jet. View Full-Text
Keywords: direct numerical simulations; jets; internal solitary waves; wave breaking on a slope; scalar transport direct numerical simulations; jets; internal solitary waves; wave breaking on a slope; scalar transport
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MDPI and ACS Style

Xu, J.; Avital, E.J.; Wang, L. Direct Numerical Simulations on Jets during the Propagation and Break down of Internal Solitary Waves on a Slope. Water 2020, 12, 671.

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