Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 3
Abstract
The present study examines the effect of upstream channel bank angle on the turbulent flow characteristics and the underlying coherent structures associated with the development of local scour in the vicinity of the leading edge of a longitudinal structure. Three laboratory experiments with channel bank angles of 28°, 45°, and 65° were carried out. Flow measurements were obtained employing a stereoscopic particle image velocimetry (SPIV) system. The characteristics of underlying energetic flow features in each of the experiments were investigated by using the proper orthogonal decomposition (POD) and optimized dynamic mode decomposition (optDMD) techniques. The SPIV results indicated that for a moderate bank slope , the horseshoe vortex (HV) amplifies turbulent kinetic energy and, consistently, bed shear stresses that consequently contribute to the local scour development. As the channel bank angle increases, and thus the degree of flow obstruction decreases, the intensity of HV declines and eventually diminishes for . Thus, the erosional capacity of the flow is reduced. The modal analyses specified that with the increase of channel bank angle, the flow energy is distributed among a larger number of POD modes and the similarity between the POD and DMD modes decreases. The relatively low energy content of the POD and DMD modes suggests the aperiodic behavior of the main necklace vortex and verifies the significant reduction in its coherency with the channel bank slope.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The support of the National Cooperative Highway Research Program (Grant No. NCHRP-HR 24–36) for this study is gratefully acknowledged. The authors are also grateful for discussions with Travis Askham. JNK acknowledges support from the Air Force Office of Scientific Research (AFOSR) Grant No. FA9550-17-1-0329.
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Published In
Journal of Hydraulic Engineering
Volume 147 • Issue 3 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 10, 2020
Accepted: Sep 25, 2020
Published online: Dec 28, 2020
Published in print: Mar 1, 2021
Discussion open until: May 28, 2021
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