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Analysis of Standing Waves in a Channel Lateral Cavity: Assessing the Performance of High-Resolution Numerical Models

Author(s): Adrian Navas-Montilla; Sergio Martinez-Aranda; Antonio Lozano; Ignacio Garcia-Palacin; Pilar Garcia-Navarro

Linked Author(s): Sergio Martínez-aranda

Keywords: Shalow water; Finite volume; Kinect; Standing wave; High order

Abstract: Resonant gravity waves, called seiches, usually appear in shallow water flows past a lateral cavity due to the excitation of an eigenmode of a gravity standing wave inside the cavity. The seiche couples with the shedding of vortices at the opening of the cavity and is sustained in time, playing a fundamental role in the hydrodynamics of the channel-cavity region. A complete understanding of this phenomenon is thus required. For this purpose, the availability of simulation models able to represent the features of such flows is a must. In this work, two-dimensional space-time measurements of the water surface elevation and velocity in a channel with a lateral cavity are presented. The free surface was captured using a pioneering non-intrusive RGB-D sensor able to record the 2D position of the transient free surface, whereas PIV was used to perform velocity measurements in the cavity. The collected data are used to construct 2D seiche amplitude maps and to extract the dominant oscillation modes, which serve as a benchmark for the evaluation of high-fidelity shallow water models. The performance of the models for the prediction of: (a) the spatial distribution of the seiche, (b) the frequency and wavelength of the seiche, (c) the time-averaged velocity and (d) the mass exchange between the main channel and the cavity is assessed.


Year: 2022

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