Optimized Generation and Absorption for Three-Dimensional Numerical Wave and Current Facilities
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 142, Issue 4
Abstract
This article presents an optimized setup for a numerical wave/current facility that allows for fast and efficient generation and absorption of random directional waves, in the presence of uniform noncollinear ambient currents. In this study, the generation of waves was optimized, in terms of computational effort, by replacing the built-in sine and cosine functions with a Taylor series approximation. The mesh in the absorption zone was also optimized with the use of a mesh grading that resulted in larger cells toward the outflow boundary. Results show that the numerical cost is reduced by 70% for the wave generation and by 90% for wave absorption. Results compare very well for wave generation with and without currents with respect to regular wave/current and random wave theories. Wave reflection was generally less than 1% for linear waves, less than 4% for nonlinear waves, and less than 5% for random waves.
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Acknowledgments
This work was developed as part of an internal research project at HR Wallingford (CAY0457). The authors are grateful to Dr. Stephen Richardson and Prof. William Allsop (HR Wallingford) for encouraging and continuously supporting this research. The authors also thank Dr. David Kelly for contributing to the development of the optimization methods, Daniele Longo and Florine Marias for their constructive feedback during the testing of the methods, and Tom Rigden for his help in postprocessing the directional wave results.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 142 • Issue 4 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 15, 2014
Accepted: Jul 27, 2015
Published online: Jan 28, 2016
Discussion open until: Jun 28, 2016
Published in print: Jul 1, 2016
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