Simulating Oscillatory and Sliding Displacements of Caisson Breakwaters Using a Coupled Approach
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 145, Issue 3
Abstract
In this work, a computational fluid dynamics (CFD) model was coupled with a dynamic response model for simulating oscillatory and sliding motions of a composite caisson breakwater subject to impulsive wave loads. The CFD model was set up with the computational toolkit Proteus, which is a FEM-based software originally developed for solving generic transport equations. It has been recently used for simulating fluid–structure interaction within the context of coastal flows by using mesh deformation and immersed solid techniques. In this study, sliding and overturning of the caisson superstructure were modeled by coupling mesh deformation techniques with a dynamic model for the caisson motion response. Results were compared with experimental data and good agreement was achieved, given the uncertainties involved. These uncertainties were also assessed through a sensitivity analysis of the caisson, which demonstrated the importance of appropriate selection of numerical parameters and precise definition of the material and physical properties. Overall, the modeling approach further advances the state of the art in similar models by being capable of modeling random sea states while using a fully coupled approach for the fluid–structure interaction problem, which also allows the prediction of pore pressure buildup and uplift forces in the rubble foundation.
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Acknowledgments
The authors gratefully acknowledge the financial support from Engineering Research and Development Centre (ERDC) and HR Wallingford through the collaboration agreement (Contract W911NF-15-2-0110). All authors are thankful to Dr. Giovanni Cuomo for his particularly useful comments while developing this work, and William Allsop for his useful discussions during the revision of the article. The third author acknowledges support from the Industrial Doctorate Centre for Offshore Renewable Energy (IDCORE) program from the Energy Technologies Institute and the Research Councils Energy Programme (Grant EP/J500847/). Permission was granted by the Chief of Engineers to publish this information.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 145 • Issue 3 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Mar 8, 2018
Accepted: Sep 4, 2018
Published online: Feb 7, 2019
Published in print: May 1, 2019
Discussion open until: Jul 7, 2019
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