Zhang, X;
Simons, R;
Zheng, J;
Zhang, C;
(2024)
Investigation on the turbulent structures in combined wave-current boundary layers.
Ocean Engineering
, 306
, Article 118073. 10.1016/j.oceaneng.2024.118073.
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Abstract
The problem of turbulent vortices and vortex dynamics under the influence of ocean waves is a subject of continuing research in the field of wave-current interaction. Thus, this study investigates the evolution of turbulence structures and vortex interactions in combined wave-current boundary layers, where water waves propagate with currents. Experiments were performed in two glass-walled laboratory channels with water depths of 160 and 400 mm. A two-dimensional two-component (2D2C) Particle Image Velocimetry (PIV) system was used to measure the velocities. Periodic variations in turbulence are observed for combined wave-current flows. Pairs of counter-rotating vortices are identified in the outer region when the combined flow is reversed, leading to destructive vortex interactions. This process leads to a reduction in the turbulent kinetic energy (TKE) and TKE production and dissipation during the passage of the wave trough. A conceptual model of hairpin vortices in combined wave-current flows is proposed in this study. The results of this study provide novel insights into the hydrodynamics of combined wave-current flows.
| Type: | Article |
|---|---|
| Title: | Investigation on the turbulent structures in combined wave-current boundary layers |
| DOI: | 10.1016/j.oceaneng.2024.118073 |
| Publisher version: | http://dx.doi.org/10.1016/j.oceaneng.2024.118073 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Wave-current interaction, PIV, Vortex interactions, Turbulent kinetic energy, Turbulence production and dissipation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10192605 |
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