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Letteratura scientifica selezionata sul tema "Recurved parapet"

Autore: Grafiati

Pubblicato: 15 febbraio 2025

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Articoli di riviste sul tema "Recurved parapet"

Castellino, Myrta, Paolo De Girolamo, Viola Monaci, Alessandro Romano e Javier L. Lara. "CONFINED-CREST IMPACT: THE INFLUENCE OF THE TOE BERM ON THE IMPULSIVE LOAD CONDITIONS". Coastal Engineering Proceedings, n. 37 (1 settembre 2023): 17. http://dx.doi.org/10.9753/icce.v37.structures.17.

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Composite vertical breakwaters are coastal structures used to defend port basins from waves in intermediate and deep water conditions. In order to safely use the inner side of harbors, it is important to limit wave overtopping. Parapet walls are used for this purpose. To improve the hydraulic efficiency of the parapet wall with a fixed crown wall height, the wall can be shaped giving rise to a recurved overhand toward the sea. Its function is to deflect back the incident waves. Recently, it has been shown that the interaction between non-breaking waves and recurved parapet can induce impulsive pressures due to the confinement of the incident wave crest deflected seaward by the overhanging structure. The new physical phenomenon has been called “Confined-Crest Impact (C-CI)” as shown by Castellino et al. 2018. This physical phenomenon can induce “unexpected” structural failure (Dermentzoglou et al., 2020). More recently, Castellino et al. (2021) extended the Goda’s formulae, which define the maximum pressures along a vertical breakwater, considering the “C-CI” induced by the presence of a recurved parapet. The conducted studies have concerned a vertical breakwater without any berm at the toe of the caisson. The purpose of this research is to extend this last work to a composite vertical breakwater based on a foundation berm.

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Castellino, Myrta, Javier L. Lara, Alessandro Romano, IÃ±igo J. Losada e Paolo De Girolamo. "WAVE LOADING FOR RECURVED PARAPET WALLS IN NON-BREAKING WAVE CONDITIONS: ANALYSIS OF THE INDUCED IMPULSIVE FORCES". Coastal Engineering Proceedings, n. 36 (30 dicembre 2018): 34. http://dx.doi.org/10.9753/icce.v36.papers.34.

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This paper describes 2-D numerical simulations aiming to reproduce the pressure impulse named confined-crest impact (Castellino et al., 2018), which occurs when a recurved parapet wall and non-breaking wave conditions are interacting. The simulations are carried out by using the IH2VOF and IHFOAM, the latter developed as OpenFOAM additional library. The results show a large increase of the pressures and forces value when the recurved part of the vertical parapet results completely occluded by the non-breaking wave crest. A sensitivity analysis has been carried out to study the influence of the geometrical parameters (radius r and opening angle a). It has been found a low variability with respect to the radius increase (from 1.0 m to 2.0 m) and a higher influence related to the opening angle variation. Finally, the non-dimensional force component has been represented as a function of the hydraulic and geometrical parameters by means of the dimensionless product (l/h)*s. These parameters represent the overhang extension seaward of the parapet, the water depth and the wave steepness with reference to deep-water conditions.

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Dermentzoglou, Dimitrios, Myrta Castellino, Paolo De Girolamo, Maziar Partovi, Gerd-Jan Schreppers e Alessandro Antonini. "Crownwall Failure Analysis through Finite Element Method". Journal of Marine Science and Engineering 9, n. 1 (31 dicembre 2020): 35. http://dx.doi.org/10.3390/jmse9010035.

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Several failures of recurved concrete crownwalls have been observed in recent years. This work aims to get a better insight within the processes underlying the loading phase of these structures due to non-breaking wave impulsive loading conditions and to identify the dominant failure modes. The investigation is carried out through an offline one-way coupling of computational fluid dynamics (CFD) generated wave pressure time series and a time-varying structural Finite Element Analysis. The recent failure of the Civitavecchia (Italy) recurved parapet is adopted as an explanatory case study. Modal analysis aimed to identify the main modal parameters such as natural frequencies, modal masses and modal shapes is firstly performed to comprehensively describe the dynamic response of the investigated structure. Following, the CFD generated pressure field time-series is applied to linear and non-linear finite element model, the developed maximum stresses and the development of cracks are properly captured in both models. Three non-linear analyses are performed in order to investigate the performance of the crownwall concrete class. Starting with higher quality concrete class, it is decreased until the formation of cracks is reached under the action of the same regular wave condition. It is indeed shown that the concrete quality plays a dominant role for the survivability of the structure, even allowing the design of a recurved concrete parapet without reinforcing steel bars.

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Ravindar, Rajendran, V. Sriram, Stefan Schimmels e Dimitris Stagonas. "LARGE-SCALE AND SMALL-SCALE EFFECTS IN WAVE BREAKING INTERACTION ON VERTICAL WALL ATTACHED WITH LARGE RECURVE PARAPET". Coastal Engineering Proceedings, n. 36v (31 dicembre 2020): 22. http://dx.doi.org/10.9753/icce.v36v.papers.22.

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Two sets of experiments on the vertical wall attached with recurve parapets performed at 1:1 and 1:8 scale are compared to study the influence of scale, model and laboratory effects. The small-scale (1:8) experiment scaled to large-scale (1:1) using Froude scaling, and Cuomo et al. (2010) method are compared. Comparing both the methods for scaling impact pressure, Cuomo et al. (2010) predicts well in the impact zone, whereas Froude scaling is better in the up-rushing zone. In estimating integrated impact force, Froude scaling method over-estimates compared to Cuomo et al. (2010). Overall, Cuomo et al. (2010) work better for scaling up impact pressure and forces compared to Froude scaling method. These preliminary observations are based on one type of recurved parapets only.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/w9WipBjMWzw

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Chen, Songtao, Weiwen Zhao e Decheng Wan. "Numerical Study on Breaking Wave Interaction with Vertical Wall Attached with Recurved Parapet". International Journal of Offshore and Polar Engineering 33, n. 2 (1 giugno 2023): 132–40. http://dx.doi.org/10.17736/ijope.2023.ak53.

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Zheng, Kaiyuan, e Xizeng Zhao. "Impact of Multiphase Flow Simulation of Breaking Waves on a Vertical Seawall with a Recurved Parapet". International Journal of Offshore and Polar Engineering 33, n. 2 (1 giugno 2023): 141–47. http://dx.doi.org/10.17736/ijope.2023.ak54.

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Benoit, Michel, William Benguigui, Maria Teles, Fabien Robaux e Christophe Peyrard. "Two-phase CFD Simulation of Breaking Waves Impacting a Coastal Vertical Wall with a Recurved Parapet". International Journal of Offshore and Polar Engineering 33, n. 2 (1 giugno 2023): 123–31. http://dx.doi.org/10.17736/ijope.2023.sv03.

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Saincher, Shaswat, V. Sriram, R. Ravindar, Shiqiang Yan, Dimitris Stagonas, Stefan Schimmels, Zhihua Xie et al. "Comparative Study on Breaking Waves Interaction with Vertical Wall Retrofitted with Recurved Parapet in Small and Large Scale". International Journal of Offshore and Polar Engineering 33, n. 2 (1 giugno 2023): 113–22. http://dx.doi.org/10.17736/ijope.2023.jc890.

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Castellino, Myrta, Alessandro Antonini, Daniele Celli, Dimitrios Dermentzoglou, Davide Pasquali, Marcello Di Risio e Paolo De Girolamo. "NUMERICAL EXPERIMENTS ON OVERHANGING PARAPETS UNDER NON-BREAKING WAVE CONDITIONS". Coastal Engineering Proceedings, n. 37 (1 settembre 2023): 85. http://dx.doi.org/10.9753/icce.v37.structures.85.

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Sea-wall and storm-wall structures aim to protect coastal areas and harbours from wave attacks. They are often located in the neighbours of city centres, that in turn impose rather severe visual limits affecting the maximum height of the structure. To combine the architectonical visual restrictions and the overtopping safety limits, imposed by different national standards, alternative solutions such as recurved parapet are often applied. Even for non-breaking wave conditions, these structures are subjected to large impulsive pressure that has been recently described and named as Confined-Crest impact, (C-CI, Castellino et al., 2018). The C-CI has been the cause of recent failures such as in the Civitavecchia harbour (Italy, Castellino et al., 2021 and Dermentzoglou et al., 2020). Accordingly, this phenomenon raised the attention of researchers and professionals who require an additional tool to design these curvilinear structures by considering the overtopping reduction performance, the structure complexity and the C-CI.

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Antonini, Alessandro, Dimitrios Dermentzoglou, Ermano de Almeida, Bas Hofland, Daniele Celli, Davide Pasquali, Marcello di Risio, Myrta Castellino e Paolo de Girolamo. "PHYSICAL EXPERIMENTS ON OVERHANGING PARAPETS UNDER NON-BREAKING WAVE CONDITIONS". Coastal Engineering Proceedings, n. 37 (1 settembre 2023): 81. http://dx.doi.org/10.9753/icce.v37.structures.81.

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The use of sea-wall and storm-wall structures within valuable landscape or urban areas often imposes rather restrictive limits in terms of structures height. A viable solution to address the safety against overtopping and the architectonical requirements is the use of recurved parapets. However, this type of structure is exposed to large impulsive loads that have been recently described and named as confined-crest impact, (C-CI), (Castellino et al., 2018) and caused several failures such as those in Strand (South Africa), Pico Island (Portugal) and Civitavecchia (Italy), (Castellino et al., 2021; Dermentzoglou et al., 2020; Martinelli et al., 2018). Accordingly, tools to properly design these curvilinear structures and to carry out comparative assessments between the induced advantage in terms of overtopping and increased structural complexity due to its shape and the C-CI are required. This work aims to identify practical design tools and provide benchmark data for the validation of the CFD model presented in the abstract n. 1643: “Castellino et al., Numerical experiments on overhanging parapets under non-breaking wave conditions”. A series of non-breaking regular and irregular waves experiments have been performed at the TU Delft Hydraulic Engineering Laboratory to investigate the contrasting behaviour of the overtopping phenomena and the exerted impulsive wave load on recurved parapets.

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Più fonti

Tesi sul tema "Recurved parapet"

Ben, Belkacem Yasmine. "Ιmpact d'événements extrêmes sur les structures de prοtectiοn côtière". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH42.

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Ce travail de recherche a pour objectif d'étudier l'impact de la houle sur les structures de protection côtières. L'objectif principal de cette étude est d'évaluer la capacité des outils CFD à modéliser et prédire avec précision l'impact des charges extrêmes des vagues sur des digues conventionnelles en enrochement avec murs de couronnement.Pour mener cette étude, le logiciel numérique OpenFOAM est utilisé pour aborder deux questions scientifiques clés : les charges impulsives des vagues agissant sur des parapets incurvés (partie supérieure du mur de couronnement) et le développement de la houle à travers le revêtement (le milieu poreux à la base de la digue).Dans un premier temps, une houle de Stokes non-linéaire est modélisée pour évaluer les performances du solveur numérique afin de reproduire le déferlement des vagues sur un mur vertical avec un parapet incurvé, et pour évaluer les pressions d'impact associées. Les résultats calculés sont comparés aux données expérimentales provenant des essais réalisés à Hanovre (Allemagne), fournies dans le cadre du benchmark ISOPE 2022.Ensuite, la physique de l'interaction des vagues avec des digues complètement immergées est étudiée expérimentalement. Sur cette base, le présent travail examine également la capacité du solveur à simuler l'interaction fluide-structure.Enfin, le présent travail discute des avantages et des limites de ces méthodes numériques utilisées en génie côtier. Les différentes conclusions de cette étude visent à répondre à la demande de INGEROP Conseil et Ingénierie concernant l'adéquation de la CFD pour leurs applications industrielles
The present work aims to investigate the water waves impact on coastal protection structures.The primary focus of this research is to assess the ability of CFD tools to accurately model and predict the impact of extreme wave loads on conventional rubble mound breakwaters with crown walls, a structure commonly designed to mitigate wave-induced forces and fight the threats associated with sealevel rise. To carry out with this investigation, the numerical toolbox OpenFOAM is employed and the problematic is approached from two key perspectives : the impulsive wave loads acting on recurved parapets (the upper portion of breakwaters) and the wave transformation through the revetment (the porous media at the base).Initially, non-linear Stokes waves are used to evaluate the performance of the numerical solver to reproduce realistic wave breaking on a vertical wall attached with a recurved parapet, and to assess the related impact pressure records. The computed results are validated against experimental data from the large wave flume (GWK) in Hannover (Germany), provided as part of the ISOPE 2022 benchmark. Next, the physics of waves interaction with submerged crested breakwaters is investigated experimentally.In fact, the present work also investigates the capability of the solver to simulate the most relevant hydrodynamics that occurs between waves and submerged breakwaters. Finally, this work discusses the advantages and thelimitations of these numerical methods used in coastal engineering. The different findingss of this study serve to adress INGEROP's inquiry regarding the suitability of CFD for their industrial applications

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Atti di convegni sul tema "Recurved parapet"

Newborn, David, Nels Sultan, Pierre Beynet, Tim Maddux, Sungwon Shin e Dan Cox. "Experimental Observations and Numerical Simulations of Wave Impact Forces on Recurved Parapets Mounted Above a Vertical Wall". In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79183.

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Large-scale hydraulic model tests and detail numerical model investigations were conducted on recurved wave deflecting structures to aid in the design of wave overtopping mitigation for vertical walls in shallow water. The incident wave and storm surge conditions were characteristic return period events for an offshore island on the North Slope of Alaska. During large storm events, despite depth-limited wave heights, a proposed vertical wall extension was susceptible to wave overtopping, which could potentially cause damage to equipment. Numeric calculations were conducted prior to the experimental tests and were used to establish the relative effectiveness of several recurved parapet concepts. The numerical simulations utilized the COrnell BReaking waves and Structures (COBRAS) fluid modeling program, which is a Volume-of-Fluid (VOF) model based on Reynolds Averaged Navier-Stokes equations [1] [2]. The experimental testing was conducted in the Large Wave Flume (LWF) at Oregon State University, O.H. Hinsdale Wave Research Laboratory. The experimental test directly measured the base shear force, vertical force, and overturning moment applied to the recurved parapets due to wave forcing. Wave impact pressure on the parapet and water particle velocities seaward of the wall were also measured. Results from the experimental testing include probability of exceedance curves for the base shear force, vertical force, and overturning moment for each storm condition. Qualitative comparisons between the experimental tests and the COBRAS simulations show that the numerical model provides realistic flow on and over the parapet.

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BEN BELKACEM, Yasmine, Gaële PERRET, Julie LEBUNTEL e Grégory PINON. "Open-FOAM computations of breaking wave impact on a vertical wall with a recurved parapet". In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2022. http://dx.doi.org/10.5150/jngcgc.2022.002.

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DE GIROLAMO, PAOLO, MYRTA CASTELLINO e ALESSANDRO ROMANO. "IMPROVEMENT IN WORKABILITY OF TERMINALS PLACED ALONG THE INNER SIDE OF PORT VERTICAL BREAKWATERS BY MEANS OF RECURVED PARAPET WALLS". In MARITIME TRANSPORT 2019. Southampton UK: WIT Press, 2019. http://dx.doi.org/10.2495/mt190031.

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Oh, Sang-Ho, Se-Chul Jang e Jooyeon Lee. "Wave Overtopping and Loading for the Recurved Parapets on the Crest of Rubble Mound Breakwater". In ICE Coasts, Marine Structures and Breakwaters. ICE Publishing, 2018. http://dx.doi.org/10.1680/cmsb.63174.0979.

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Ravindar, Rajendran, e V. Sriram. "Study on the load altering capability of recurve parapets using model scale experiments". In OCEANS 2022 - Chennai. IEEE, 2022. http://dx.doi.org/10.1109/oceanschennai45887.2022.9775226.

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Kortenhaus, A., J. Pearson, T. Bruce, N. W. H. Allsop e J. W. van der Meer. "Influence of Parapets and Recurves on Wave Overtopping and Wave Loading of Complex Vertical Walls". In Coastal Structures 2003. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40733(147)31.

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