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Gridless simulations of splashing processes and near-shore bore propagation

Published online by Cambridge University Press:  30 October 2007

M. LANDRINI ,
A. COLAGROSSI ,
M. GRECO  and
M. P. TULIN
M. LANDRINI
Affiliation:
INSEAN, The Italian Ship Model Basin, Via di Vallerano 139, 00128 Roma, Italy Ocean Engineering Laboratory, UCSB, California, USAmpt6@cox.net
A. COLAGROSSI*
Affiliation:
INSEAN, The Italian Ship Model Basin, Via di Vallerano 139, 00128 Roma, Italy
M. GRECO
Affiliation:
INSEAN, The Italian Ship Model Basin, Via di Vallerano 139, 00128 Roma, Italy
M. P. TULIN
Affiliation:
Ocean Engineering Laboratory, UCSB, California, USAmpt6@cox.net
*
‡Author to whom correspondence should be addressed.
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Abstract

The generation and evolution of two-dimensional bores in water of uniform depth and on sloping beaches are simulated through numerical solution of the Euler equations using the smoothed particle hydrodynamics (SPH) method, wherein particles are followed in Lagrangian fashion, avoiding the need for computational grids. In water of uniform depth, a piston wavemaker produces cyclically breaking bores in the Froude number range 1.37–1.82, which were shown to move at time-averaged speeds in very good agreement with the requirements of global mass and momentum conservation. A single Strouhal number for the breaking period was discovered. Complex repetitive splashing patterns are observed and described, involving forward jet formation growth, impact and ricochet, and similarly, backward jet formation and impact. Observed consequences were the creation of vortical regions of both signs, dipole creation through pairing, large-scale transport of surface water downward and high tangential scouring velocities on the bed, which are quantified. These bores are further allowed to rise on linear slopes to the shoreline, where they are seen to collapse into a tongue-like flow resembling dam-break evolution.

This essentially inviscid calculation is able to reproduce the development of a highly vortical flow in excellent agreement with experimental observations and theoretical concepts. The turbulent flow behaviour is partially described by the numerical solution.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 591 , 25 November 2007 , pp. 183 - 213
Copyright
Copyright © Cambridge University Press 2007

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Footnotes

†

Deceased 26 June 2003.

References

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