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Dr. M. Graça Neves
National Laboratory of Civil Engineering (LNEC)

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0 Coastal Engineering
0 Reflections
0 overtopping
0 maritime engineering
0 wave analysis

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Coastal Engineering
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Journal article
Published: 12 August 2021 in Journal of Marine Science and Engineering
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This paper presents a study of run-up/overtopping over a smooth impermeable dike with promenade using 2D and 3D mesh-based and mesh-free numerical models and results from 2D physical modelling for strong energetic incident waves. These waves induce plunging wave breaking and a complex water/air mixture turbulent flow before overtopped the dike, a challenging configuration for numerical models. The analysis is structured in two phases: (i) evaluates the results of 2D numerical and physical models for run-up and overtopping; (ii) compares qualitatively the results of 3D numerical models for overtopping over a dike with promenade between groins located in front of a slope beach. The results indicate that the main differences obtained in run-up and overtopping are due to differences in wave generation and active absorption systems used in physical and numerical models and in turbulent models used by the numerical models. These differences lead to changes on incident wave height and on wave breaking and, consequently, on reflection, run-up and overtopping over the structure. For 3D simulation, even if larger discrepancies were found on overtopping along the dike, mean wave overtopping discharge and water flow height at the crest of the groin head show a similar order of magnitude.

ACS Style

Maria Graça Neves; Eric Didier; Moisés Brito; María Clavero. Numerical and Physical Modelling of Wave Overtopping on a Smooth Impermeable Dike with Promenade under Strong Incident Waves. Journal of Marine Science and Engineering 2021, 9, 865 .

AMA Style

Maria Graça Neves, Eric Didier, Moisés Brito, María Clavero. Numerical and Physical Modelling of Wave Overtopping on a Smooth Impermeable Dike with Promenade under Strong Incident Waves. Journal of Marine Science and Engineering. 2021; 9 (8):865.

Chicago/Turabian Style

Maria Graça Neves; Eric Didier; Moisés Brito; María Clavero. 2021. "Numerical and Physical Modelling of Wave Overtopping on a Smooth Impermeable Dike with Promenade under Strong Incident Waves." Journal of Marine Science and Engineering 9, no. 8: 865.

Journal article
Published: 05 March 2021 in Journal of Marine Science and Engineering
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The correct calculation of forces and moments caused by wave action over crown wall structures is critical for their design. There are several existing equations for this, some of which are sanctioned in practice as it is the case for Jensen (1984) and Bradbury et al. (1998), Günback and Gökce (1984), Martin et al. (1999), Berenguer and Baonza (2006), and Pedersen (1996) and Nørgaard et al. (2013). These equations are the main tool for the design of breakwater crown walls and their accuracy is crucial to ensure the stability of the crown wall, especially when considering the sea level rise due to climate change and the possible damage of the armor, since both aspects are not usually considered in most original design studies. In a scenario of climate change, it is very important to estimate the possible changes in security factors due to both these aspects, comparing the results with the original design ones. This paper has as main objective to analyze it for the case study of Ericeira rubble mound breakwater in Portugal. For this, a comparison of the results using those equations and different scenarios including the current, considering sea level rise and armor damage, were performed to extract some conclusions: the increase in the sea level in the case study was not significant and therefore its incidence is very small; and the damage to the main armor by losing pieces at the berm is much more important in this case study, so it is essential to carry out the proper maintenance of the design section. On the other hand, horizontal forces are more conservative using Pedersen and Nørgaard equations, obtaining the lowest value with Martin. Regarding uplift pressures, Martin gives the lowest value, while the most conservative values are given by Günbak and Gökce’s for two scenarios, and Pedersen and Nørgaard for the other two scenarios. Furthermore, the sliding safety coefficient is more conditioning than overturning the safety coefficient in all the scenarios.

ACS Style

Fábio Pereira; Maria Neves; José-Santos López-Gutiérrez; María Esteban; Vicente Negro. Comparison of Existing Equations for the Design of Crown Walls: Application to the Case Study of Ericeira Breakwater (Portugal). Journal of Marine Science and Engineering 2021, 9, 285 .

AMA Style

Fábio Pereira, Maria Neves, José-Santos López-Gutiérrez, María Esteban, Vicente Negro. Comparison of Existing Equations for the Design of Crown Walls: Application to the Case Study of Ericeira Breakwater (Portugal). Journal of Marine Science and Engineering. 2021; 9 (3):285.

Chicago/Turabian Style

Fábio Pereira; Maria Neves; José-Santos López-Gutiérrez; María Esteban; Vicente Negro. 2021. "Comparison of Existing Equations for the Design of Crown Walls: Application to the Case Study of Ericeira Breakwater (Portugal)." Journal of Marine Science and Engineering 9, no. 3: 285.

Journal article
Published: 01 February 2021 in Sustainability
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Artificial neural networks (ANN) are extremely powerful analytical, parallel processing elements that can successfully approximate any complex non-linear process, and which form a key piece in Artificial Intelligence models. Its field of application, being very wide, is especially suitable for the field of prediction. In this article, its application for the prediction of the overtopping rate is presented, as part of a strategy for the sustainable optimization of coastal or harbor defense structures and their conversion into Waves Energy Converters (WEC). This would allow, among others benefits, reducing their initial high capital expenditure. For the construction of the predictive model, classical multivariate statistical techniques such as Principal Component Analysis (PCA), or unsupervised clustering methods like Self Organized Maps (SOM), are used, demonstrating that this close alliance is always methodologically beneficial. The specific application carried out, based on the data provided by the CLASH and EurOtop 2018 databases, involves the creation of a useful application to predict overtopping rates in both sloping breakwaters and seawalls, with good results both in terms of prediction error, such as correlation of the estimated variable.

ACS Style

José Oliver; M. Esteban; José-Santos López-Gutiérrez; Vicente Negro; M. Neves. Optimizing Wave Overtopping Energy Converters by ANN Modelling: Evaluating the Overtopping Rate Forecasting as the First Step. Sustainability 2021, 13, 1483 .

AMA Style

José Oliver, M. Esteban, José-Santos López-Gutiérrez, Vicente Negro, M. Neves. Optimizing Wave Overtopping Energy Converters by ANN Modelling: Evaluating the Overtopping Rate Forecasting as the First Step. Sustainability. 2021; 13 (3):1483.

Chicago/Turabian Style

José Oliver; M. Esteban; José-Santos López-Gutiérrez; Vicente Negro; M. Neves. 2021. "Optimizing Wave Overtopping Energy Converters by ANN Modelling: Evaluating the Overtopping Rate Forecasting as the First Step." Sustainability 13, no. 3: 1483.

Journal article
Published: 01 December 2020 in Journal of Marine Science and Engineering
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The main objective of this paper is to characterize the flow field on the front face of an oscillating wave surge converter (OWSC) under a regular wave. For this purpose, the longitudinal and vertical velocity components were measured using an Ultrasonic Velocity Profiler (UVP). In order to explain the main trends of the OWSC’s dynamics, the experimental data were firstly compared with the analytical results of potential theory. A large discrepancy was observed between experimental and analytical results, caused by the nonlinear behavior of wave-OWSC interaction that determine the turbulent field and the boundary layer. The experimental velocity field shows a strong ascendant flow generated by the mass transfer over the flap (overtopping) and flow rotation generated by the beginning of the flap deceleration and acceleration. These features (overtopping and flow rotation) have an important role on the power capture of OWSC and, therefore, analytical results are not accurate to describe the complex hydrodynamics of OWSC.

ACS Style

Moisés Brito; Rui M. L. Ferreira; Luis Teixeira; Maria G. Neves; Luís Gil. Experimental Investigation of the Flow Field in the Vicinity of an Oscillating Wave Surge Converter. Journal of Marine Science and Engineering 2020, 8, 976 .

AMA Style

Moisés Brito, Rui M. L. Ferreira, Luis Teixeira, Maria G. Neves, Luís Gil. Experimental Investigation of the Flow Field in the Vicinity of an Oscillating Wave Surge Converter. Journal of Marine Science and Engineering. 2020; 8 (12):976.

Chicago/Turabian Style

Moisés Brito; Rui M. L. Ferreira; Luis Teixeira; Maria G. Neves; Luís Gil. 2020. "Experimental Investigation of the Flow Field in the Vicinity of an Oscillating Wave Surge Converter." Journal of Marine Science and Engineering 8, no. 12: 976.

Journal article
Published: 10 September 2020 in Water
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The advances in computational fluid dynamics have made numerical modeling a reliable complementary tool to the traditional physical modeling in the study of the wave overtopping phenomenon. This paper addresses overtopping on a seawall by combining the numerical models XBeach (nonhydrostatic and Surfbeat modes) and IH2VOF, and the Mase formulas. This work is structured in two phases: (i) phase I assesses the performance of numerical models and formulas in modeling wave runup and overtopping on a seawall for a solid profile bottom and representative hydromorphologic conditions of a study site in the Portuguese west coast; (ii) phase II investigates the effect of the profile bottom variation in the overtopping phenomenon for extreme maritime storm field conditions of the study site, considering a solid bottom and a varying sandy bottom. The results indicate that XBeach underestimates the wave energy, and the frequency and intensity of the overtopping occurrences predicted by IH2VOF; the numerical models’ runup and overtopping discharge predictions are overestimated by the Mase formulas, in simplified and in storm field conditions; and the variation of the bottom morphology throughout the storm event greatly influences the XBeach predictions, while the Mase results are mostly influenced by the bottom roughness.

ACS Style

João Nuno C. Oliveira; Filipa S. B. F. Oliveira; Maria Graça Neves; María Clavero; António A. Trigo-Teixeira. Modeling Wave Overtopping on a Seawall with XBeach, IH2VOF, and Mase Formulas. Water 2020, 12, 2526 .

AMA Style

João Nuno C. Oliveira, Filipa S. B. F. Oliveira, Maria Graça Neves, María Clavero, António A. Trigo-Teixeira. Modeling Wave Overtopping on a Seawall with XBeach, IH2VOF, and Mase Formulas. Water. 2020; 12 (9):2526.

Chicago/Turabian Style

João Nuno C. Oliveira; Filipa S. B. F. Oliveira; Maria Graça Neves; María Clavero; António A. Trigo-Teixeira. 2020. "Modeling Wave Overtopping on a Seawall with XBeach, IH2VOF, and Mase Formulas." Water 12, no. 9: 2526.

Journal article
Published: 22 November 2019 in Renewable Energy
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The aim of this paper is the experimental characterization of the capture width ratio (CWR) and response amplitude operator (RAO) of a 1:10 physical model of an oscillating wave surge converter (OWSC), under unidirectional regular and irregular waves. The effects of hydraulic power take-off (PTO) system are explicitly taken in consideration. A mathematical model is proposed to describe the PTO damping as a function of the angular velocity of the flap. The harmonic decomposition of free-surface elevation, angular velocity of the flap and pressure in the PTO system demonstrates that these signals are dominated by their linear component. However, the signals also present some important higher-order frequency components. To predict the CWR of the OWSC under irregular waves the nonlinear output frequency response functions are considered as the extension of the RAO to the nonlinear case. It is shown and discussed that the PTO system, wave frequency and height have a significant influence on the CWR and RAO. The RAO curve for irregular waves does not exhibit a well-defined peak, showing a limited variation in a broadband. A weak correlation between CWR and RAO was found, i.e., the maximum CWR does not occur for the maximum value of RAO.

ACS Style

Moisés Brito; Rui M. L. Ferreira; Luis Teixeira; Maria G. Neves; Ricardo B. Canelas. Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves. Renewable Energy 2019, 151, 975 -992.

AMA Style

Moisés Brito, Rui M. L. Ferreira, Luis Teixeira, Maria G. Neves, Ricardo B. Canelas. Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves. Renewable Energy. 2019; 151 ():975-992.

Chicago/Turabian Style

Moisés Brito; Rui M. L. Ferreira; Luis Teixeira; Maria G. Neves; Ricardo B. Canelas. 2019. "Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves." Renewable Energy 151, no. : 975-992.

Journal article
Published: 07 August 2019 in Renewable Energy
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Mechanical constraints have a non-negligible influence in the motion of oscillating wave surge converter (OWSC) devices. The key novelty of this paper is a numerical simulation tool for OWSCs that does not neglect or significantly compromise mechanical constraints such as hydraulic power take-off (PTO) system, revolute joints and frictional contacts among components. The paper is aimed at presenting the key components of the numerical simulation tool and at validating it with laboratory data featuring an OWSC with mechanical constraints under regular and irregular waves. It is based on the implementation of the multibody solver of Project Chrono under the Smoothed Particle Hydrodynamics (SPH) model of DualSPHysics, where the SPH solver resolves the interaction between wave and flap and the multibody solver resolves the interaction between flap and mechanical constraints. Comparison between numerical results and experimental data show that the numerical simulation tool properly predicts the dynamics of the OWSC. Furthermore, in what concerns hydrodynamics of the near-flap flow, the computed and measured free-surface elevations and phase-averaged flow field show reasonable agreement. Once properly validated, the numerical simulation tool is then applied to study the influence of several mechanical constraints, PTO damping characteristics and flap inertia on the hydrodynamic of the OWSC. The viability of OWSC design solutions based on the developed numerical simulation tool is emphasised, in view of its performance in the test cases to which it was subjected.

ACS Style

M. Brito; R.B. Canelas; Orlando García-Feal; José M. Domínguez; A.J.C. Crespo; Rui M. L. Ferreira; M.G. Neves; L. Teixeira. A numerical tool for modelling oscillating wave surge converter with nonlinear mechanical constraints. Renewable Energy 2019, 146, 2024 -2043.

AMA Style

M. Brito, R.B. Canelas, Orlando García-Feal, José M. Domínguez, A.J.C. Crespo, Rui M. L. Ferreira, M.G. Neves, L. Teixeira. A numerical tool for modelling oscillating wave surge converter with nonlinear mechanical constraints. Renewable Energy. 2019; 146 ():2024-2043.

Chicago/Turabian Style

M. Brito; R.B. Canelas; Orlando García-Feal; José M. Domínguez; A.J.C. Crespo; Rui M. L. Ferreira; M.G. Neves; L. Teixeira. 2019. "A numerical tool for modelling oscillating wave surge converter with nonlinear mechanical constraints." Renewable Energy 146, no. : 2024-2043.

Journal article
Published: 01 August 2019 in Defect and Diffusion Forum
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Knowledge of forces due to the action of waves on submarine outfalls composed by a pipe and stabilizing concrete weights, considering the wave propagation direction to the outfalls, is essential to their design. 3D numerical models based on RANS-VoF (Reynolds-Average-Navier-Stokes Volume-of-Fluid) are able to estimate forces on the pipe and weights. The present study aims to simulate a submarine outfall with stabilizing concrete weights at 1:15 scale which was previously tested in the 3D Shallow Water Basin at the Danish Hydraulics Institute (DHI) to analyse the influence of the direction of the incident wave and the distance from the pipe to the bottom on the outfall forces. In this study, numerical results are compared with experimental ones for waves with four different amplitudes and with wave incidence perpendicular to the outfall. The use of k-ω SST turbulence model led to good agreement between numerical drag and lift forces and experimental ones, with a mean difference of 8.9 and 7.6%, respectively.

ACS Style

Eric Didier; Maria Da Graça Neves; Paulo R.F. Teixeira. Analysis of Forces on a Submarine Outfall by a RANS-VoF Numerical Wave Tank. Defect and Diffusion Forum 2019, 396, 50 -59.

AMA Style

Eric Didier, Maria Da Graça Neves, Paulo R.F. Teixeira. Analysis of Forces on a Submarine Outfall by a RANS-VoF Numerical Wave Tank. Defect and Diffusion Forum. 2019; 396 ():50-59.

Chicago/Turabian Style

Eric Didier; Maria Da Graça Neves; Paulo R.F. Teixeira. 2019. "Analysis of Forces on a Submarine Outfall by a RANS-VoF Numerical Wave Tank." Defect and Diffusion Forum 396, no. : 50-59.

Journal article
Published: 03 May 2019 in Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782)
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Neste artigo descreve-se o novo programa OSOM+, sob a responsabilidade do Laboratório Nacional de Engenharia Civil (LNEC), Portugal, para a observação e monitorização sistemática de obras marítimas, o qual tem vindo a ser aplicado a um grande número de estruturas marítimas na costa continental portuguesa e no estrangeiro. O programa OSOM+ compreende quatro componentes principais a realizar em cada estrutura marítima: a) Inspeções visuais periódicas por técnico experiente; b) Inspeções aéreas periódicas com utilização de UAV/drone; c) A base de dados ANOSOM-GIS, para armazenar e/ou consultar as informações obtidas, bem como para avaliar os estados atuais, de evolução e de risco das estruturas; e d) Uma aplicação móvel, portátil, para preenchimento em tempo real e visualização das informações da base de dados ANOSOM-GIS.Esta metodologia, recentemente atualizada, engloba uma série de ferramentas cujas funcionalidades são ilustradas neste trabalho pela sua aplicação a um estudo de caso: o quebra-mar da Ericeira, em Portugal.

ACS Style

Conceicao Juana Fortes; Rui Pereira Capitão; Maria João Henriques; Rute Maria Lemos; Maria Graça Neves; Maria Teresa Reis; Luís Gabriel Silva. OBSERVAÇÃO E MONITORIZAÇÃO DE OBRAS MARÍTIMAS COM A NOVA METODOLOGIA OSOM+. Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782) 2019, 4, 1 .

AMA Style

Conceicao Juana Fortes, Rui Pereira Capitão, Maria João Henriques, Rute Maria Lemos, Maria Graça Neves, Maria Teresa Reis, Luís Gabriel Silva. OBSERVAÇÃO E MONITORIZAÇÃO DE OBRAS MARÍTIMAS COM A NOVA METODOLOGIA OSOM+. Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782). 2019; 4 (2):1.

Chicago/Turabian Style

Conceicao Juana Fortes; Rui Pereira Capitão; Maria João Henriques; Rute Maria Lemos; Maria Graça Neves; Maria Teresa Reis; Luís Gabriel Silva. 2019. "OBSERVAÇÃO E MONITORIZAÇÃO DE OBRAS MARÍTIMAS COM A NOVA METODOLOGIA OSOM+." Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782) 4, no. 2: 1.

Journal article
Published: 01 April 2018 in Ocean Engineering
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ACS Style

Tiago C.A. Oliveira; Maria Graça Neves; Raquel Fidalgo; Rita Esteves. Variability of wave parameters and H/H relationship under storm conditions offshore the Portuguese continental coast. Ocean Engineering 2018, 153, 10 -22.

AMA Style

Tiago C.A. Oliveira, Maria Graça Neves, Raquel Fidalgo, Rita Esteves. Variability of wave parameters and H/H relationship under storm conditions offshore the Portuguese continental coast. Ocean Engineering. 2018; 153 ():10-22.

Chicago/Turabian Style

Tiago C.A. Oliveira; Maria Graça Neves; Raquel Fidalgo; Rita Esteves. 2018. "Variability of wave parameters and H/H relationship under storm conditions offshore the Portuguese continental coast." Ocean Engineering 153, no. : 10-22.

Journal article
Published: 01 March 2018 in Journal of Hydro-environment Research
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ACS Style

A. Mendonça; J. Dias; E. Didier; C.J.E.M. Fortes; M.G. Neves; M.T. Reis; J.M.P. Conde; P. Poseiro; P.R.F. Teixeira. An integrated tool for modelling oscillating water column (OWC) wave energy converters (WEC) in vertical breakwaters. Journal of Hydro-environment Research 2018, 19, 198 -213.

AMA Style

A. Mendonça, J. Dias, E. Didier, C.J.E.M. Fortes, M.G. Neves, M.T. Reis, J.M.P. Conde, P. Poseiro, P.R.F. Teixeira. An integrated tool for modelling oscillating water column (OWC) wave energy converters (WEC) in vertical breakwaters. Journal of Hydro-environment Research. 2018; 19 ():198-213.

Chicago/Turabian Style

A. Mendonça; J. Dias; E. Didier; C.J.E.M. Fortes; M.G. Neves; M.T. Reis; J.M.P. Conde; P. Poseiro; P.R.F. Teixeira. 2018. "An integrated tool for modelling oscillating water column (OWC) wave energy converters (WEC) in vertical breakwaters." Journal of Hydro-environment Research 19, no. : 198-213.

Journal article
Published: 29 September 2017 in Journal of Tribology
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Hydraulic cylinders are generally used as power take-off (PTO) mechanisms in wave energy converters (WECs). The dynamic behavior of its PTO force, which integrates friction and pressure forces, is a difficult constraint to include in an analytical or in a numerical model. In this paper, the PTO force characteristics of a hydraulic cylinder are experimentally and numerically investigated under different magnitudes of controlled excitation force. In order to characterize the dynamic behaviors of PTO force, the displacement, acceleration, and pressure in the cylinder chamber for given excitation forces are measured. The pressure force is calculated using the measured value of the pressure, and the friction force is calculated based on the equation of motion using measured values of the pressure, excitation force, and acceleration of the piston. Experimental results show clearly a strong nonlinear force–velocity characteristics, including stochastic and hysteretic behaviors. To model the hysteretic behavior, the modified LuGre model is used for the friction force and a new approach is proposed for the pressure force. To model the stochastic behavior of the friction and pressure forces, the spectral representation method is used. The systematically comparison between measured and simulated results shows that the numerical model captures most of dynamic behaviors of PTO force.

ACS Style

Moisés Brito; Luis Teixeira; Ricardo B. Canelas; Rui M. L. Ferreira; Maria G. Neves. Experimental and Numerical Studies of Dynamic Behaviors of a Hydraulic Power Take-Off Cylinder Using Spectral Representation Method. Journal of Tribology 2017, 140, 021102 .

AMA Style

Moisés Brito, Luis Teixeira, Ricardo B. Canelas, Rui M. L. Ferreira, Maria G. Neves. Experimental and Numerical Studies of Dynamic Behaviors of a Hydraulic Power Take-Off Cylinder Using Spectral Representation Method. Journal of Tribology. 2017; 140 (2):021102.

Chicago/Turabian Style

Moisés Brito; Luis Teixeira; Ricardo B. Canelas; Rui M. L. Ferreira; Maria G. Neves. 2017. "Experimental and Numerical Studies of Dynamic Behaviors of a Hydraulic Power Take-Off Cylinder Using Spectral Representation Method." Journal of Tribology 140, no. 2: 021102.

Journal article
Published: 01 March 2017 in Defect and Diffusion Forum
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This paper presents the validation of active and passive, made by a dissipation beach, numerical absorbing methods implemented in RANS-VOF FLUENT® code for modelling long time series of wave propagation interacting with coastal structures. Verification of both numerical techniques was performed in 2D – wave flume, and 3D – wave tank, this one using a multiple active absorption wave makers. The active absorption wave maker allows maintaining the incident wave generation and the mean water level along the time. Good results were obtained for 2D and 3D applications for active absorption wave maker at the generation boundary and both numerical beach and active absorption at the end of the flume/tank.

ACS Style

Eric Didier; Paulo R.F. Teixeira; Maria Graça Neves. A 3D Numerical Wave Tank for Coastal Engineering Studies. Defect and Diffusion Forum 2017, 372, 1 -10.

AMA Style

Eric Didier, Paulo R.F. Teixeira, Maria Graça Neves. A 3D Numerical Wave Tank for Coastal Engineering Studies. Defect and Diffusion Forum. 2017; 372 ():1-10.

Chicago/Turabian Style

Eric Didier; Paulo R.F. Teixeira; Maria Graça Neves. 2017. "A 3D Numerical Wave Tank for Coastal Engineering Studies." Defect and Diffusion Forum 372, no. : 1-10.

Conference paper
Published: 01 January 2017 in Proceedings of the XXXVIII Iberian Latin American Congress on Computational Methods in Engineering
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Conference Proceedings System by SWGE™ CopyRight 2016- SWGE Sistemas Ltda.

ACS Style

Lucas Amaral Gaspar; Paulo Roberto De Freitas Teixeira; Eric Didier; Maria Da Graça Neves. Numerical analysis of the distribution of incident wave energy on an onshore oscillating water column wave energy converter. Proceedings of the XXXVIII Iberian Latin American Congress on Computational Methods in Engineering 2017, 1 .

AMA Style

Lucas Amaral Gaspar, Paulo Roberto De Freitas Teixeira, Eric Didier, Maria Da Graça Neves. Numerical analysis of the distribution of incident wave energy on an onshore oscillating water column wave energy converter. Proceedings of the XXXVIII Iberian Latin American Congress on Computational Methods in Engineering. 2017; ():1.

Chicago/Turabian Style

Lucas Amaral Gaspar; Paulo Roberto De Freitas Teixeira; Eric Didier; Maria Da Graça Neves. 2017. "Numerical analysis of the distribution of incident wave energy on an onshore oscillating water column wave energy converter." Proceedings of the XXXVIII Iberian Latin American Congress on Computational Methods in Engineering , no. : 1.

Journal article
Published: 01 September 2016 in Journal of Hydro-environment Research
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Highlights•Accuracy of a 2D RANS model IH2VOF to simulated forces on a submerged cylinder is verified.•The same trend of fundamental quantities with the gap between the cylinder and the bottom was obtained.•Lift forces and streamlines show good agreement compared with the experimental results.•The Morison method shows the better agreement to estimate the drag and inertia coefficients. AbstractA 2D RANS numerical model (IH2VOF) is employed to study wave interacting with a circular cylinder with a diameter of 0.02 m in a water depth of 0.27 m, with a wave period of 1.08 s and a wave height of 0.047 m. The influence of the wall proximity on the forces is analyzed for ratios between the pipe (i.e. circular cylinder) distance from the bottom and the pipe diameter varying from 0.04 to 1.5. Results of lift forces and streamlines are compared with the experimental results of Jarno-Druaux et al. (1995) and good agreement is found. Lift, drag and inertia coefficients are also compared with experimental results and the same trend of fundamental quantities with the gap between the cylinder and the bottom was obtained with the model giving slightly larger values. Finally, the influence of the method to estimate the drag and inertia coefficients in the force calculated using Morison equation is analyzed and Morison method shows the better agreement.

ACS Style

João Inverno; Maria Graça Neves; Eric Didier; Javier L. Lara. Numerical simulation of wave interacting with a submerged cylinder using a 2D RANS model. Journal of Hydro-environment Research 2016, 12, 1 -15.

AMA Style

João Inverno, Maria Graça Neves, Eric Didier, Javier L. Lara. Numerical simulation of wave interacting with a submerged cylinder using a 2D RANS model. Journal of Hydro-environment Research. 2016; 12 ():1-15.

Chicago/Turabian Style

João Inverno; Maria Graça Neves; Eric Didier; Javier L. Lara. 2016. "Numerical simulation of wave interacting with a submerged cylinder using a 2D RANS model." Journal of Hydro-environment Research 12, no. : 1-15.

Journal article
Published: 01 September 2016 in Ocean Engineering
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ACS Style

Eric Didier; Diogo R.C.B. Neves; Paulo R.F. Teixeira; João Dias; Maria Graça Neves. Smoothed particle hydrodynamics numerical model for modeling an oscillating water chamber. Ocean Engineering 2016, 123, 397 -410.

AMA Style

Eric Didier, Diogo R.C.B. Neves, Paulo R.F. Teixeira, João Dias, Maria Graça Neves. Smoothed particle hydrodynamics numerical model for modeling an oscillating water chamber. Ocean Engineering. 2016; 123 ():397-410.

Chicago/Turabian Style

Eric Didier; Diogo R.C.B. Neves; Paulo R.F. Teixeira; João Dias; Maria Graça Neves. 2016. "Smoothed particle hydrodynamics numerical model for modeling an oscillating water chamber." Ocean Engineering 123, no. : 397-410.

Journal article
Published: 01 June 2016 in Revista de Gestão Costeira Integrada
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ACS Style

Miguel Bairrão; Maria Da Graça Neves; Maria Teresa Reis; Francisco Taveira Pinto. Galgamento de uma estrutura portuária protegida por um quebra-mar submerso: o caso do porto de Leixões, Portugal. Revista de Gestão Costeira Integrada 2016, 16, 121 -131.

AMA Style

Miguel Bairrão, Maria Da Graça Neves, Maria Teresa Reis, Francisco Taveira Pinto. Galgamento de uma estrutura portuária protegida por um quebra-mar submerso: o caso do porto de Leixões, Portugal. Revista de Gestão Costeira Integrada. 2016; 16 (2):121-131.

Chicago/Turabian Style

Miguel Bairrão; Maria Da Graça Neves; Maria Teresa Reis; Francisco Taveira Pinto. 2016. "Galgamento de uma estrutura portuária protegida por um quebra-mar submerso: o caso do porto de Leixões, Portugal." Revista de Gestão Costeira Integrada 16, no. 2: 121-131.

Journal article
Published: 01 April 2016 in Coastal Engineering
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Highlights•The paper describes the physical modelling of a submerged coastal structure.•The paper provides a comparative study of the prototype sinking results with modelling outputs.•Over spilling velocity caused onshore scouring and the sinking of the modules.•Properly linking the modules and using a bed protection layer below the structure appear to provide a stable solution for the sinking phenomenon in the present field case. AbstractWave-induced flow velocity and turbulence may cause scouring in the seabed around coastal structures depending on the wave climate and tidal water depth. A 3-D physical modelling study was conducted to investigate the possible causes of the sinking of two submerged coastal structures on the Santa Maria del Mar (SMM) beach, Spain. The experimental investigation was conducted by employing a Froude similarity law with a geometric scale of 1:20, and the submerged modular structure was subjected to different wave climates and tidal water levels. The combinations of the significant wave height and peak period were chosen from in-situ real wave conditions that were monitored during the sinking of the prototype structures. Linking and unlinking conditions for the modules in the structure were investigated in this study. The results show that the modules sank to approximately 48% of their height at the end of the tests with storm waves and semi-linking conditions of low water depth. Most of the experimental results were compatible with the prototype monitoring results. Tests with proper linking among the modules and tests with an appropriate gravel foundation resulted in a sustainable solution because they presented much less or almost no scouring and sinking.

ACS Style

A.B.M. Khan-Mozahedy; Juan Jose Muñoz-Perez; Maria G. Neves; Francisco Sancho; Rita Cavique. Mechanics of the scouring and sinking of submerged structures in a mobile bed: A physical model study. Coastal Engineering 2016, 110, 50 -63.

AMA Style

A.B.M. Khan-Mozahedy, Juan Jose Muñoz-Perez, Maria G. Neves, Francisco Sancho, Rita Cavique. Mechanics of the scouring and sinking of submerged structures in a mobile bed: A physical model study. Coastal Engineering. 2016; 110 ():50-63.

Chicago/Turabian Style

A.B.M. Khan-Mozahedy; Juan Jose Muñoz-Perez; Maria G. Neves; Francisco Sancho; Rita Cavique. 2016. "Mechanics of the scouring and sinking of submerged structures in a mobile bed: A physical model study." Coastal Engineering 110, no. : 50-63.

Journal article
Published: 01 May 2015 in Coastal Engineering
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ACS Style

Juan Jose Muñoz-Perez; A.B.M. Khan-Mozahedy; M.G. Neves; B. Tejedor; G. Gomez-Pina; J.M. Campo; V. Negro. Sinking of concrete modules into a sandy seabed: A case study. Coastal Engineering 2015, 99, 26 -37.

AMA Style

Juan Jose Muñoz-Perez, A.B.M. Khan-Mozahedy, M.G. Neves, B. Tejedor, G. Gomez-Pina, J.M. Campo, V. Negro. Sinking of concrete modules into a sandy seabed: A case study. Coastal Engineering. 2015; 99 ():26-37.

Chicago/Turabian Style

Juan Jose Muñoz-Perez; A.B.M. Khan-Mozahedy; M.G. Neves; B. Tejedor; G. Gomez-Pina; J.M. Campo; V. Negro. 2015. "Sinking of concrete modules into a sandy seabed: A case study." Coastal Engineering 99, no. : 26-37.

Journal article
Published: 28 April 2014 in Journal of Coastal Research
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Carrasco, A.R., Reis, M.T., Neves, M.G., Ferreira, Ó., Matias, A, Almeida, S., 2014. Overtopping hazard on a rubble mound breakwater. In: Green, A.N. and Cooper, J.A.G. (eds.), Proceedings 13th International Coastal Symposium (Durban, South Africa), Journal of Coastal Research, Special Issue No. 70, pp. 247–252, ISSN 0749-0208. A major concern of coastal engineering is not only to access the damage to coastal structures by severe wave overtopping, but also the hazard imposed to users. Local hazard is often associated to the volume of overtopping water per unit of time (called overtopping discharge). Despite two decades of intensive research, it is yet not fully clear to practitioners what is the best method to compute the discharge parameter and its application on the assessment of local hazard. This work provides insight into the overtopping characterization in rubble mound breakwaters, by distinguishing different methods to assess hazardous overtopping. Fieldwork was conducted over a tidal cycle in a breakwater located at Albufeira Harbour (South coast of Portugal) under storm conditions (Hso~ 3 m; Tp ~ 9 s). Mean overtopping discharges were calculated from field measurements of flow depths and velocities at the breakwater slope armour and at the impermeable crest. Two different velocities were calculated: overtopping leading-edge velocity and overtopping peak velocity. The two methods provided similar results, with higher velocities occurring during high-tide (between 2 and 10 m/s). Mean overtopping discharges at the beginning of the impermeable crest ranged between 0.2 and 0.8 l/s/m. Under the measured hydrodynamic conditions, the breakwater offers risk to all types of pedestrians. Additionally it is shown that field measurements compare relatively well with empirical prediction methods (for the overall analysed overtopping events), namely the corrected NN_OVERTOPPING2 neural network tool. Besides contributing to the overall database on wave overtopping in coastal structures, the presented results can also be used for calibration and validation of overtopping evaluation methods (empirical formulae, artificial neural networks and numerical and physical models).

ACS Style

A. Rita Carrasco; Maria G. Neves; Maria T. Reis; Oscar Ferreira; Ana Matias; Sílvia Almeida. Overtopping hazard on a rubble mound breakwater. Journal of Coastal Research 2014, 70, 247 -252.

AMA Style

A. Rita Carrasco, Maria G. Neves, Maria T. Reis, Oscar Ferreira, Ana Matias, Sílvia Almeida. Overtopping hazard on a rubble mound breakwater. Journal of Coastal Research. 2014; 70 ():247-252.

Chicago/Turabian Style

A. Rita Carrasco; Maria G. Neves; Maria T. Reis; Oscar Ferreira; Ana Matias; Sílvia Almeida. 2014. "Overtopping hazard on a rubble mound breakwater." Journal of Coastal Research 70, no. : 247-252.