Floating ice is one of the potential hazards that threatens the safety of seaport operations in winter. In this study, the monitoring data of the ice conditions around the Port of Yingkou in the ice zone of China were analyzed. The results showed a significant negative correlation between changes in cargo throughput and the magnitude level of sea ice. When the ice thickness is more than 15 cm, it can have serious impacts on port operations unless tugboats and icebreakers are deployed to remove sea ice from the channel.
{"title":"Analysis of Sea Ice Hazard Factors and Influence on Seaport Operations in the Bohai Sea","authors":"Xueqin Liu, Yujin Zhang, Danzhu Yu, Shuai Yuan, Wenqi Shi, Zhenhua Chen","doi":"10.17736/ijope.2023.ik10","DOIUrl":"https://doi.org/10.17736/ijope.2023.ik10","url":null,"abstract":"Floating ice is one of the potential hazards that threatens the safety of seaport operations in winter. In this study, the monitoring data of the ice conditions around the Port of Yingkou in the ice zone of China were analyzed. The results showed a significant negative correlation between changes in cargo throughput and the magnitude level of sea ice. When the ice thickness is more than 15 cm, it can have serious impacts on port operations unless tugboats and icebreakers are deployed to remove sea ice from the channel.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135347826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.mmm30
Yi Zhang, N. Ma, X. Gu, Qiqi Shi
{"title":"Surrogate Model Based on an MLP Neural Network and Bayesian Hyperparameter Tuning for Ship Hull Form Optimization","authors":"Yi Zhang, N. Ma, X. Gu, Qiqi Shi","doi":"10.17736/ijope.2023.mmm30","DOIUrl":"https://doi.org/10.17736/ijope.2023.mmm30","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45262963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.sv03
M. Benoit, W. Benguigui, M. Teles, Fabien Robaux, C. Peyrard
Breaking wave impacts on coastal protections are simulated using a multi-phase 3D CFD (Computational Fluid Dynamics) software, named neptune cfd, focusing on a particular lay-out composed of a plane slop-ing bottom and a vertical wall with a recurved parapet on top of it. The goal is to assess the capabilities and performances of the solver to simulate the propagation of regular waves over the variable bathymetry (in-cluding shoaling and nonlinear e ff ects), the depth-induced breaking process and the interaction of these breaking waves with the vertical wall. We simulate two experiments involving similar geometry of the seabed and vertical wall, performed at two di ff erent scales (1:8 for case A and 1:1 for case B), as described in Ravindar et al. (2021). After a descrip-tion of the CFD solver and its numerical methods, the model is applied to the simulation of the two cases involving extremely high impact pressure peaks at some places of the wall surface. Numerical results are compared with experimental measurements regarding both free surface elevation and pressure on the wall. In general, a good agreement of the simulations with the measurements is obtained for free surface elevation, including the breaking zone. The time history of pressure variations dur-ing wave impacts is correctly reproduced. Although the measured maximum impact pressure peaks exhibit some variability among successive wave impacts, the order of magnitude of these maximum peaks is well predicted for case A. For case B, however, the maximum impact pressures are somewhat underestimated by the current simulations, requiring further tests and improvements. This work is a contribution to the bench-mark “Comparative Study on Breaking Waves Interactions with Vertical Wall attached with Recurved Parapet in Small and Large Scale” set up for the ISOPE’2022 conference.
{"title":"Two-phase CFD Simulation of Breaking Waves Impacting a Coastal Vertical Wall with a Recurved Parapet","authors":"M. Benoit, W. Benguigui, M. Teles, Fabien Robaux, C. Peyrard","doi":"10.17736/ijope.2023.sv03","DOIUrl":"https://doi.org/10.17736/ijope.2023.sv03","url":null,"abstract":"Breaking wave impacts on coastal protections are simulated using a multi-phase 3D CFD (Computational Fluid Dynamics) software, named neptune cfd, focusing on a particular lay-out composed of a plane slop-ing bottom and a vertical wall with a recurved parapet on top of it. The goal is to assess the capabilities and performances of the solver to simulate the propagation of regular waves over the variable bathymetry (in-cluding shoaling and nonlinear e ff ects), the depth-induced breaking process and the interaction of these breaking waves with the vertical wall. We simulate two experiments involving similar geometry of the seabed and vertical wall, performed at two di ff erent scales (1:8 for case A and 1:1 for case B), as described in Ravindar et al. (2021). After a descrip-tion of the CFD solver and its numerical methods, the model is applied to the simulation of the two cases involving extremely high impact pressure peaks at some places of the wall surface. Numerical results are compared with experimental measurements regarding both free surface elevation and pressure on the wall. In general, a good agreement of the simulations with the measurements is obtained for free surface elevation, including the breaking zone. The time history of pressure variations dur-ing wave impacts is correctly reproduced. Although the measured maximum impact pressure peaks exhibit some variability among successive wave impacts, the order of magnitude of these maximum peaks is well predicted for case A. For case B, however, the maximum impact pressures are somewhat underestimated by the current simulations, requiring further tests and improvements. This work is a contribution to the bench-mark “Comparative Study on Breaking Waves Interactions with Vertical Wall attached with Recurved Parapet in Small and Large Scale” set up for the ISOPE’2022 conference.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49523503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.sv05
Qian Li, S. Yan, Yi Zhang, Ningbo Zhang, Q. Ma, Zhihua Xie
{"title":"Numerical Modelling of Breaking Wave Impacts on Seawalls with Recurved Parapets Using qaleFOAM","authors":"Qian Li, S. Yan, Yi Zhang, Ningbo Zhang, Q. Ma, Zhihua Xie","doi":"10.17736/ijope.2023.sv05","DOIUrl":"https://doi.org/10.17736/ijope.2023.sv05","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47058663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.sv04
S. Chen, X. Hu, Fuyin Cui, W. Wang
{"title":"Numerical Comparative Study on Violent Wave Interactions with a Curved Seawall","authors":"S. Chen, X. Hu, Fuyin Cui, W. Wang","doi":"10.17736/ijope.2023.sv04","DOIUrl":"https://doi.org/10.17736/ijope.2023.sv04","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48841568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.sh33
Kazuhisa Otsubo
{"title":"On Wave-induced Coupled Motion During Cooperative Multicrane Lifting Operations with Two Vessels","authors":"Kazuhisa Otsubo","doi":"10.17736/ijope.2023.sh33","DOIUrl":"https://doi.org/10.17736/ijope.2023.sh33","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45149495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.mt34
Haoyun Tang, Zicheng He, Xianku Zhang, Qian Wan
{"title":"Autonomous Recognition of a Ship Structure Characteristic Signal Based on Machine Learning","authors":"Haoyun Tang, Zicheng He, Xianku Zhang, Qian Wan","doi":"10.17736/ijope.2023.mt34","DOIUrl":"https://doi.org/10.17736/ijope.2023.mt34","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44271950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.jc890
S. Saincher, V. Sriram, R. Ravindar, S. Yan, D. Stagonas, S. Schimmels, Zhihua Xie, M. Benoit, W. Benguigui, M. Teles, Fabien Robaux, C. Peyrard, Andreas Asiikkis, C. Frantzis, A. Vakis, D. Grigoriadis, Qian Li, Q. Ma, Ningbo Zhang, Kaiyuan Zheng, Xizeng Zhao, Xiao Hu, Shuling Chen, Songtao Chen, Qing-jie Meng, Weiwen Zhao, D. Wan
This paper presents the ISOPE-2022 conference comparative study on the interaction between breaking waves and a vertical wall with a recurved parapet. The experiments, on the basis of which the comparative study has been conducted, were carried out at small scale (1:8) in the Department of Ocean Engineering, IIT Madras, as well as at large scale (1:1) in the Großer Wellenkanal (GWK), Hannover. The paper discusses the qualitative and quantitative comparisons between 10 different numerical solvers from various universities across the world. The numerical solvers presented in this paper are the recent state of the art in the field; some are commercial, and some have been developed in-house by various academic institutes. The participating codes have been benchmarked for their ability to capture interactions between the incident waves and waves reflected from the seawall. The codes have also been benchmarked for their ability to replicate multiple loading cycles, in time domain, evaluated at selected pressure probe locations over the vertical wall and recurved parapet. The same pressure-time histories have also been compared in the frequency domain to evaluate the solvers’ capability to capture the multitude of harmonics characterizing the impact load. Furthermore, the values of peak impact pressure over five loading cycles have been compared to assess the overall robustness of the codes in simulating repeated impact events at model and prototype scales.
{"title":"Comparative Study on Breaking Waves Interaction with Vertical Wall Retrofitted with Recurved Parapet in Small and Large Scale","authors":"S. Saincher, V. Sriram, R. Ravindar, S. Yan, D. Stagonas, S. Schimmels, Zhihua Xie, M. Benoit, W. Benguigui, M. Teles, Fabien Robaux, C. Peyrard, Andreas Asiikkis, C. Frantzis, A. Vakis, D. Grigoriadis, Qian Li, Q. Ma, Ningbo Zhang, Kaiyuan Zheng, Xizeng Zhao, Xiao Hu, Shuling Chen, Songtao Chen, Qing-jie Meng, Weiwen Zhao, D. Wan","doi":"10.17736/ijope.2023.jc890","DOIUrl":"https://doi.org/10.17736/ijope.2023.jc890","url":null,"abstract":"This paper presents the ISOPE-2022 conference comparative study on the interaction between breaking waves and a vertical wall with a recurved parapet. The experiments, on the basis of which the comparative study has been conducted, were carried out at small scale (1:8) in the Department of Ocean Engineering, IIT Madras, as well as at large scale (1:1) in the Großer Wellenkanal (GWK), Hannover. The paper discusses the qualitative and quantitative comparisons between 10 different numerical solvers from various universities across the world. The numerical solvers presented in this paper are the recent state of the art in the field; some are commercial, and some have been developed in-house by various academic institutes. The participating codes have been benchmarked for their ability to capture interactions between the incident waves and waves reflected from the seawall. The codes have also been benchmarked for their ability to replicate multiple loading cycles, in time domain, evaluated at selected pressure probe locations over the vertical wall and recurved parapet. The same pressure-time histories have also been compared in the frequency domain to evaluate the solvers’ capability to capture the multitude of harmonics characterizing the impact load. Furthermore, the values of peak impact pressure over five loading cycles have been compared to assess the overall robustness of the codes in simulating repeated impact events at model and prototype scales.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42730975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.17736/ijope.2023.ak53
Songtao Chen, Weiwen Zhao, D. Wan
This paper numerically investigates breaking wave interaction with a vertical wall attached with a recurved parapet in 1:8 model scale, as part of the ISOPE-2022 comparative study. The in-house CFD solver naoe-FOAM-SJTU based on the open source platform OpenFOAM is used to perform all simulations. For wave generation, a novel generating-absorbing boundary condition (GABC) is adopted to replace the time-consuming moving boundary wavemaker. A geometric volume-of-fluid (VOF) method based on piecewise-linear interface calculation (PLIC) is incorporated in the present numerical model to capture the sharp interface and improve the accuracy of the predicted impact pressure. The time history and frequency analysis of the wave elevation and pressure at each probe are compared with the experimental data. The comparison demonstrates that the present numerical model is able to predict the impact pressure with sufficient accuracy but gives less accurate results of wave elevation. Moreover, the evolutions of free surface, pressure, and vorticity distribution are further provided to achieve a better understanding of this complex wave-structure interaction issue as a good complement to the experiments.
{"title":"Numerical Study on Breaking Wave Interaction with Vertical Wall Attached with Recurved Parapet","authors":"Songtao Chen, Weiwen Zhao, D. Wan","doi":"10.17736/ijope.2023.ak53","DOIUrl":"https://doi.org/10.17736/ijope.2023.ak53","url":null,"abstract":"This paper numerically investigates breaking wave interaction with a vertical wall attached with a recurved parapet in 1:8 model scale, as part of the ISOPE-2022 comparative study. The in-house CFD solver naoe-FOAM-SJTU based on the open source platform OpenFOAM is used to perform all simulations. For wave generation, a novel generating-absorbing boundary condition (GABC) is adopted to replace the time-consuming moving boundary wavemaker. A geometric volume-of-fluid (VOF) method based on piecewise-linear interface calculation (PLIC) is incorporated in the present numerical model to capture the sharp interface and improve the accuracy of the predicted impact pressure. The time history and frequency analysis of the wave elevation and pressure at each probe are compared with the experimental data. The comparison demonstrates that the present numerical model is able to predict the impact pressure with sufficient accuracy but gives less accurate results of wave elevation. Moreover, the evolutions of free surface, pressure, and vorticity distribution are further provided to achieve a better understanding of this complex wave-structure interaction issue as a good complement to the experiments.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43435954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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