Porous Effect Parameter of Thin Permeable Plates

Abstract

The present paper aims at getting the porous effect parameter G of a thin permeable wall. The reflection and transmission coefficients of a thin vertical porous wall with different porous shapes and porosities are obtained by a physical model experiment. The reflection coefficient and total horizontal wave load on a perforated caisson are also obtained by another experiment. Analytical solutions of wave interaction with these two vertical porous breakwaters are introduced. The reflection and transmission coefficients between predictions and experimental results of authors' and four other researchers' are compared. By comparisons, the estimate methods of the linearized resistance coefficient f and the inertial effect coefficient s of the permeable plate are recommended. Following the formula of Yu [1995], the values of G are calculated by f and s. A complete estimate method of porous effect parameter G is presented, which consists of the formula of Yu [1995] and the present experimental formula. The estimate method of G is validated by comparing * Corresponding author. 309 Coast. Eng. J. 2006.48:309-336. Downloaded from www.worldscientific.com by UNIVERSITY OF CALIFORNIA @ SAN DIEGO on 01/03/15. For personal use only. 310 Y. Li, Y. Liu & B. Teng the predicted values of the total horizontal wave loads on the perforated caisson with the experimental results.

The Interaction of Oblique Waves With a Partially Immersed Wave Absorbing Breakwater

“…(14). For calculating G, ε = 20% was adopted as used in the tests, s = 1 was adopted as usual, and the resistance coefficient f was estimated by a simply empirical formula of Li et al (2006) ). The value of the dimensionless barrier thickness δ/d (barrier thickness / water depth) was not given in Cox et al (1998).…”

Calculation of Permeability Parameter of Perforated Wall

“…It may be worthwhile to compare the present result with that of other researchers and propose an empirical formula by combining these results. We calculated the friction coefficient f as a function of h rb / using the aforementioned method for the data of Hagiwara (1984), Kriebel (1992), Kakuno and Liu (1993), Isaacson et al (1998), Cho and Kim (2002), Li et al (2006), andHuang (2007a,b). Fig.…”

“…Sollitt and Cross 1972;Losada et al 1993;Yu 1995;Isaacson et al 1998;Zhu and Chwang 2001;Hossain et al 2001) proposed to use the value of 0  m C , or 1  s through comparisons between predicted and experimental values of reflection and transmission coefficients of perforated structures. Recently Li et al (2006) proposed a formula to calculate the friction coefficient as a function of h b / . In the present paper, we show that the porosity of the wall is also an important variable and propose a formula for the friction coefficient as a function of h rb / .…”

A new model of viscous dissipation for an oscillating wave surge converter

“…The complex-valued parameter, which characterises the inertial and viscous effects, is treated as an empirical quantity. In [17], this parameter is termed the 'porous-wall-effectparameter' G and is determined by comparison to model tests [23].…”

“…The effect of viscous dissipation on the device's performance is then quantified. We do not conduct dedicated model tests to validate our model, but rather our results may be compared to model tests in a straightforward way [23,13].…”