Numerical Simulations of Wave Generation by a Vertical Plunger Using RANS and SPH Models
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134, Issue 3
Abstract
The water wave generation by a freely falling rigid body is examined in this paper. Two different two-dimensional numerical approaches have been utilized to simulate the time histories of fluid motion, free surface deformation, and the vertical displacement of a rectangular-shape rigid body. While the first approach is based on the Reynolds-averaged Navier–Stokes (RANS) equations, with the closure model to compute the turbulence intensity, the second uses the smoothed particle hydrodynamics (SPH) method. Numerical simulations using several different initial elevations of the rigid body and different water depths have been performed. The displacement of the moving rigid body is determined by dynamic equilibrium of the forces acting on the body. Numerical results obtained from both approaches are discussed and compared with experimental data. Images of the free surface profile and falling rigid body recorded from the laboratory tests are compared with numerical results. Good agreement is observed. Numerical solutions for the velocity fields, pressure distributions, and turbulence intensities in the vicinity of the falling rigid body are also presented. The similarity and discrepancy between the solutions obtained by the two approaches are discussed.
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Acknowledgments
Partial support from the National Science Foundation Grant Nos. NSFCMS-9908392 and NSFCMS-0217744, and the U.S. Office of Naval Research Grant Nos. ONRN00014-04-10008 and ONRN00014-06-10326 are gratefully acknowledged. Experiments and the SPH numerical simulations were funded by The Italian National Dam Office and by MIUR projects (COFIN 2004 “Onde di maremoto generate da frane in corpi idrici: meccanica della generazione e della propagazione, sviluppo di modelli previsionali e di sistemi di allerta in tempo reale basati su misure mareografiche”) whose scientific coordinator is Professor Paolo De Girolamo, L’Aquila University. He is gratefully acknowledged. Finally, the writers thank the Consorzio Ricerca Gran Sasso that has provided the computer resources needed to run SPH simulations.MIUR
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 3 • May 2008
Pages: 143 - 159
Copyright
© 2008 ASCE.
History
Received: Mar 7, 2006
Accepted: Sep 12, 2006
Published online: May 1, 2008
Published in print: May 2008
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