Abstract
In this work the phenomenon of the wave reflection has been studied using a self-developed passive extinction system. Twenty one type of waves were generated in the laboratory using a piston-type wave maker. The variation of the reflection coefficient, Kr, was studied at several depths (h [m] of 0.3, 0.4, and 0.5), periods (0.636 < T [s] < 1.526), wave heights (0.010 < H [m] < 0.064), slopes (3 < α [°] < 17) and vertical end positions of the extinction system (y1 [m] and y2 [m] defined by y1 [m] and α [°]), covering the linear and non-linear regions of the “Le Méhauté” chart. In parallel, an unsteady numerical model based on the Eulerian multiphase VOF was designed and validated according to the free surface displacement, ɳi, and the calculation of the Kr values. Both type of validations were successful so this model was used in order to determine Kr values at slopes [°] that could not be physically reached by the extinction system. The obtained results allowed to determine the minimum Kr values for each set of experiments and finding a useful non-dimensional relationship of Kr,(h-y1)/λ and Ir as a function of the dispersion parameter, kh.
Highlights
Wave reflection is a phenomenon that may occur in some experi mental facilities, such as wave flumes or tanks, when the induced waves interact with any total or partially submerged structure that may be the object of study or the boundary of the fluid domain
The phenomenon of the reflection has been studied using a selfdeveloped passive extinction system installed in a wave flume of 12.5 m long, 0.60 m wide and 0.7 m high
A computational model based on the Eulerian multiphase volume of fluid (VOF) un steady model was designed to reflect through simulations any of the conditions that can be reproduced in the experimental wave flume
Summary
Wave reflection is a phenomenon that may occur in some experi mental facilities, such as wave flumes or tanks, when the induced waves interact with any total or partially submerged structure that may be the object of study or the boundary of the fluid domain. The second one, so called “propagation area” consists of the section of the flume where the wave, once fully developed, travels along the flume without suffering any significant modification on its wavelength, period, height or shape This is the appropriate zone to carry out most of the research activities, such as experiments with floating structures or WECs. the “extinction area” that usually consists of a structure where the wave energy is partially (passive systems) or completely (active systems) dissipated. It is a meshless model that defines the movement and in teractions of spherical particles based on Navier-Stokes equations (Higuera et al, 2015) It has been used in the solution of several case studies, such as breaking waves (Dalrymple and Rogers, 2006), green waters (Gomez-Gesteira et al, 2005) or the behaviour of floating bodies under extreme wave conditions (Zhao and Hu, 2012)
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