Fast 3D Simulation of Nonhydrostatic Flows Using a Modified Ghost-Cell Free-Surface Pressure Treatment
Publication: Journal of Hydraulic Engineering
Volume 148, Issue 5
Abstract
Treatment of the free-surface pressure boundary (FSPB) remains a challenge for the three-dimensional (3D) nonhydrostatic hydrodynamic models using a vertical staggered-grid variable arrangement. Through the tests of the small-amplitude wave, it was found that the pressure of the top layer of the vertical grid is semihydrostatic for vertical staggered-grid nonhydrostatic models. Based on this finding, a modified ghost-cell FSPB treatment is proposed and a fully nonhydrostatic staggered-grid model developed. The new method is simple and easy to implement, and has the self-calibration property of its parameters. The model was further tested using a laboratory experiment of nonlinear waves propagating over a bar toward a beach. Sensitivity studies of model parameters and grid scales were performed. The vertical staggered-grid model using the new FSPB treatment is shown to require only coarse vertical grids to achieve accurate simulations of nonhydrostatic free-surface flows.
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Data Availability Statement
All of the data, models, and/or code that support the findings of this study are available from the corresponding author by request.
Acknowledgments
Financial support from China’s National Natural Science Foundation (52179058) and the Foundation of the Yangtze River Scientific Research Institute, China (CKSF2021530/HL) is acknowledged.
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Published In
Journal of Hydraulic Engineering
Volume 148 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 20, 2021
Accepted: Jan 13, 2022
Published online: Feb 21, 2022
Published in print: May 1, 2022
Discussion open until: Jul 21, 2022
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