Experimental study of bidirectional seiching in an open-channel, lateral cavity in the time and frequency domain

Engelen, Lukas; Perrot-Minot, C.; Mignot, Emmanuel; Rivière, Nicolas; Mulder, Tom De

doi:10.1103/physrevfluids.5.104801

Cited by 7 publications

(11 citation statements)

References 27 publications

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“…Tsubaki and Fujita (2006) reported amplitudes of the free-surface oscillation up to 15% of the mean water depth. Besides Wolfinger et al (2012), Tuna et al (2013) and Engelen et al (2020) reported an increasing amplitude up to Fr ∼ 0.7 followed by a decreasing amplitude for higher Froude numbers. Regarding the oscillation modes, Kimura and Hosoda (1997) (1)] with a single node along the x axis (nx = 1) and none along y (ny = 0 in Fig.…”

Section: B State Of the Artmentioning

confidence: 95%

“…Seiches are mainly studied in laboratories under simplified geometries and hydraulic conditions with a straight, 1D, steady flow in the main stream (Kimura and Hosoda, 1997;Tsubaki and Fujita, 2006;Meile et al, 2011;Wolfinger et al, 2012;Tuna et al, 2013;Mignot et al, 2015;and Engelen et al, 2020). The cavities are usually rectangular in planform, at right angles with the main stream, with sharp edges, smooth walls, a horizontal bed, and no step between the main stream and the cavity.…”

Section: B State Of the Artmentioning

confidence: 99%

“…3). Besides, Mignot et al (2015) and Engelen et al (2020) studied the specific case of a cavity where the transverse extension of the cavity plus the main stream equals twice the cavity length:…”

Section: B State Of the Artmentioning

confidence: 99%

“…The natural mode and associated natural frequency are very rapidly reached and do not change with time any further. Oppositely, while the order of magnitude of the oscillation amplitude is reached after only 10 min, several hours are required to reach a quite established seiche amplitude [this is not true for bi-directional seiching, where the surface oscillation switches from one dominant mode to another over long periods, as discussed in detail by Engelen et al (2020)].…”

Section: Physics Of Fluidsmentioning

confidence: 99%

“…IV). At Ghent, the analysis of the synchronized signals from the ultrasound and both pressure sensors permits us to distinguish the oscillation mode by evaluating the cross-spectra between the three recorded time series (Engelen et al, 2020).…”

Section: Articlementioning

confidence: 99%

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Seiches in lateral cavities with simplified planform geometry: Oscillation modes and synchronization with the vortex shedding

et al. 2020

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Lateral cavities adjacent to open-channel flows are dead zones located on one side of a main stream. With an approaching flow with a high (subcritical) Froude number, the free-surface of the dead-zone oscillates with high amplitudes and generates a so-called seiche. This configuration is reproduced in a rectangular cavity (with an interface length equal to the main stream channel width) in which the impact of the three dimensionless parameters (Froude number, dimensionless water depth, and geometrical aspect ratio) affecting the seiche is studied experimentally. For all configurations, a natural mode of the cavity is observed, this mode being either longitudinal or transverse, except in the case of a square cavity where bi-directional seiching occurs. Moreover, we show that while the approaching Froude number (0.55 < Fr < 0.7) and dimensionless water depth do not affect the oscillation mode, the selected natural mode is strongly dependent on the geometrical aspect ratio of the cavity. For narrow cavities (small [W + b]/b with W and b the cavity and channel widths, respectively), a longitudinal mode occurs while for wider cavities transverse modes occur, with an increasing number of nodes as the width of the cavity increases. Finally, measuring the time-resolved 2-dimensional field of free-surface deformation in the cavity and the adjacent main stream permits us to identify the vortices shed along the mixing layer at the cavity/main stream interface and thus to analyze the synchronization between the surface oscillation and vortex shedding (at the upstream edge) and impinging (at the downstream edge) processes.

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