The outburst fragmentation of soil caused by the dissociation of the gas hydrate was studied based on experiments and numerical simulation. The dense discrete particle model (DDPM) combined with the kinetic theory of granular flow (KTGF) was presented to reveal the outburst morphology of soil, considering the interphase forces and frictional effect between soil particles. The numerical simulation results in geometric features are consistent with the high-speed photography results. Moreover, the effects of initial gas pressure and thicknesses of the overlying layer on the occurrence of gas outburst were investigated in the experiments.
{"title":"Experimental and Numerical Study of Gas Outburst with Soil Under Gas Expansion","authors":"Danning Liu, Peng Li, Xuhui Zhang, Xiaobing Lu, Jiyan Qiao, Zhenpeng Leng, Yan Zhang","doi":"10.17736/ijope.2022.jc862","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc862","url":null,"abstract":"The outburst fragmentation of soil caused by the dissociation of the gas hydrate was studied based on experiments and numerical simulation. The dense discrete particle model (DDPM) combined with the kinetic theory of granular flow (KTGF) was presented to reveal the outburst morphology of soil, considering the interphase forces and frictional effect between soil particles. The numerical simulation results in geometric features are consistent with the high-speed photography results. Moreover, the effects of initial gas pressure and thicknesses of the overlying layer on the occurrence of gas outburst were investigated in the experiments.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47371704","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 : 2022-06-01DOI: 10.17736/ijope.2022.mm27
D. Konispoliatis, A. S. Mavrakos, S. Mavrakos
The present paper aims at investigating the efficiency of a cylindrical WEC placed in front of a vertical, surface-piercing breakwater of infinite length. A theoretical model is presented based on the linearized velocity potential, the image theory, and the matched axisymmetric eigenfunction expansion formulations. The WECs under examination are the heaving absorber and the oscillating water column device. From the present analysis, it is demonstrated that the absorbed wave power by the examined WECs in front of a vertical wall is strongly affected by the geometrical parameters of the converters and their mechanical components; thus, they should be properly considered when designing the WEC-breakwater system to increase its wave power efficiency.
{"title":"Efficient Properties of Different Types of Wave Energy Converters Placed in Front of a Vertical Breakwater","authors":"D. Konispoliatis, A. S. Mavrakos, S. Mavrakos","doi":"10.17736/ijope.2022.mm27","DOIUrl":"https://doi.org/10.17736/ijope.2022.mm27","url":null,"abstract":"The present paper aims at investigating the efficiency of a cylindrical WEC placed in front of a vertical, surface-piercing breakwater of infinite length. A theoretical model is presented based on the linearized velocity potential, the image theory, and the matched axisymmetric eigenfunction expansion formulations. The WECs under examination are the heaving absorber and the oscillating water column device. From the present analysis, it is demonstrated that the absorbed wave power by the examined WECs in front of a vertical wall is strongly affected by the geometrical parameters of the converters and their mechanical components; thus, they should be properly considered when designing the WEC-breakwater system to increase its wave power efficiency.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44011127","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 : 2022-06-01DOI: 10.17736/ijope.2022.jc859
R. B. Guzenko, Y. Mironov, R. May, V. S. Porubaev, K. Kornishin, Yaroslav Efimov
This paper describes the morphometric particularities of first-year ice ridges, comprehensively studied in the Kara and Laptev Seas. The distributions of the main morphometric characteristics of ice ridges are given, and the corresponding theoretical approximations are proposed. The connection between the parameters of the ice blocks that make up the sail and other morphometric characteristics of the ice ridge is shown. Empirical relationships between the parameters of the sail and the parameters of the ice ridge are proposed. The particularities of the morphometry of the ice ridges with the largest average consolidated layer thickness are revealed.
{"title":"Morphometry of First-Year Ice Ridges with Greatest Thickness of the Consolidated Layer and Other Statistical Patterns","authors":"R. B. Guzenko, Y. Mironov, R. May, V. S. Porubaev, K. Kornishin, Yaroslav Efimov","doi":"10.17736/ijope.2022.jc859","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc859","url":null,"abstract":"This paper describes the morphometric particularities of first-year ice ridges, comprehensively studied in the Kara and Laptev Seas. The distributions of the main morphometric characteristics of ice ridges are given, and the corresponding theoretical approximations are proposed. The connection between the parameters of the ice blocks that make up the sail and other morphometric characteristics of the ice ridge is shown. Empirical relationships between the parameters of the sail and the parameters of the ice ridge are proposed. The particularities of the morphometry of the ice ridges with the largest average consolidated layer thickness are revealed.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43483026","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 : 2022-06-01DOI: 10.17736/ijope.2022.et06
C. Bleicher, J. Niewiadomski, Axel Kansy, H. Kaufmann
The increasing need for lighter components for wind energy application led to an increasing afford in the foundries to develop high-strength nodular cast iron materials (GJS) offering both high strength and high ductility. High-silicon nodular cast iron is one of those developments. Nevertheless, until now, to the best of our knowledge, no real characterization of these materials in terms of cyclic material behavior has been done. Thus, in this paper, one of the high-silicon nodular cast iron grades, EN-GJS-500-14, was investigated to determine the technological, statistical, and geometrical size effects for a proper component design a lifetime assessment.
{"title":"High-Silicon Nodular Cast Iron for Lightweight Optimized Wind Energy Components","authors":"C. Bleicher, J. Niewiadomski, Axel Kansy, H. Kaufmann","doi":"10.17736/ijope.2022.et06","DOIUrl":"https://doi.org/10.17736/ijope.2022.et06","url":null,"abstract":"The increasing need for lighter components for wind energy application led to an increasing afford in the foundries to develop high-strength nodular cast iron materials (GJS) offering both high strength and high ductility. High-silicon nodular cast iron is one of those developments. Nevertheless, until now, to the best of our knowledge, no real characterization of these materials in terms of cyclic material behavior has been done. Thus, in this paper, one of the high-silicon nodular cast iron grades, EN-GJS-500-14, was investigated to determine the technological, statistical, and geometrical size effects for a proper component design a lifetime assessment.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47321315","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 : 2022-03-01DOI: 10.17736/ijope.2022.jc841
Ziying Yu, Xing Zheng, Hongbin Hao, S. Yan, Q. Ma
This paper presents a numerical investigation of a floating offshore wind turbine (FOWT) in a complex marine environment consisting of winds and waves. The investigation takes account of the aerodynamics and hydrodynamics of the FOWT system and their interactions simultaneously by using the hybrid model qaleFOAM, which combines a fully nonlinear potential solver with a two-phase Navier–Stokes solver using a domain decomposition approach. The qaleFOAM model is validated by comparing its predictions with experimental and numerical results available in the public domain and then is applied to model the FOWT in a unidirectional focused wave with a peak period of 42.31 s accompanied by a uniform wind of 11.4 m/s. The result reveals a significant interaction between the aerodynamic and hydrodynamic responses of the FOWT in such conditions. Moreover, it demonstrates that the most extreme response of the FOWT may not occur at the highest wave.
{"title":"Numerical Simulation of a Floating Offshore Wind Turbine in Waves Using qaleFOAM","authors":"Ziying Yu, Xing Zheng, Hongbin Hao, S. Yan, Q. Ma","doi":"10.17736/ijope.2022.jc841","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc841","url":null,"abstract":"This paper presents a numerical investigation of a floating offshore wind turbine (FOWT) in a complex marine environment consisting of winds and waves. The investigation takes account of the aerodynamics and hydrodynamics of the FOWT system and their interactions simultaneously by using the hybrid model qaleFOAM, which combines a fully nonlinear potential solver with a two-phase Navier–Stokes solver using a domain decomposition approach. The qaleFOAM model is validated by comparing its predictions with experimental and numerical results available in the public domain and then is applied to model the FOWT in a unidirectional focused wave with a peak period of 42.31 s accompanied by a uniform wind of 11.4 m/s. The result reveals a significant interaction between the aerodynamic and hydrodynamic responses of the FOWT in such conditions. Moreover, it demonstrates that the most extreme response of the FOWT may not occur at the highest wave.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45654122","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 : 2022-03-01DOI: 10.17736/ijope.2022.ts24
Hassan el Sheshtawy, M. Youssef, O. el Moctar, T. Schellin
{"title":"Experimental and Numerical Investigation of Fluid-structure Interaction for a Submerged Oscillating Cylinder in a Lock-in Region","authors":"Hassan el Sheshtawy, M. Youssef, O. el Moctar, T. Schellin","doi":"10.17736/ijope.2022.ts24","DOIUrl":"https://doi.org/10.17736/ijope.2022.ts24","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41820894","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 : 2022-03-01DOI: 10.17736/ijope.2022.jc840
Jiaye Gong, Yunbo Li, S. Yan, Q. Ma, Z. Hong
This paper presents a one-way coupling method based on the open-source computational fluid dynamics tool OpenFOAM. This hybrid method that couples the fully nonlinear potential theory (FNPT)-based quasi-arbitrary Lagrangian–Eulerian finite element method (QALE-FEM) with the viscous flow method is applied to simulate the forward movement and motion of a trimaran in stern waves. With this hybrid method and the corresponding solver qaleFOAM, the linear and nonlinear incident waves are generated by the external domain of FNPT-based QALE-FEM. The waves propagate to the internal domain by a transition zone. The interaction between the wave and trimaran model in the internal domain is simulated by the viscous flow method. The validation of the wave generation is carried out first. Then, the motion of the trimaran model in stern waves is simulated. Finally, by changing the forward speed and the wave parameters, the amplitude and time history are obtained to analyze the trimaran’s motion characteristics in stern waves.
{"title":"Numerical Study on the Motion and Added Resistance of a Trimaran in Stern Waves Using a Hybrid Method","authors":"Jiaye Gong, Yunbo Li, S. Yan, Q. Ma, Z. Hong","doi":"10.17736/ijope.2022.jc840","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc840","url":null,"abstract":"This paper presents a one-way coupling method based on the open-source computational fluid dynamics tool OpenFOAM. This hybrid method that couples the fully nonlinear potential theory (FNPT)-based quasi-arbitrary Lagrangian–Eulerian finite element method (QALE-FEM) with the viscous flow method is applied to simulate the forward movement and motion of a trimaran in stern waves. With this hybrid method and the corresponding solver qaleFOAM, the linear and nonlinear incident waves are generated by the external domain of FNPT-based QALE-FEM. The waves propagate to the internal domain by a transition zone. The interaction between the wave and trimaran model in the internal domain is simulated by the viscous flow method. The validation of the wave generation is carried out first. Then, the motion of the trimaran model in stern waves is simulated. Finally, by changing the forward speed and the wave parameters, the amplitude and time history are obtained to analyze the trimaran’s motion characteristics in stern waves.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43951208","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 : 2022-03-01DOI: 10.17736/ijope.2022.jc838
Xiao-song Zhang, Weiwen Zhao, D. Wan
The vertical plunging jet is a typical multiscale two-phase flow problem in which a large number of microbubbles are formed by the impingement of a liquid jet with a free surface. Traditional numerical simulation methods experience difficulty reproducing both the large-scale phase interface evolution and the small-scale microbubbles at the same time. In this paper, a hybrid volume-of-fluid (VOF)/Euler–Lagrange method is adopted to simulate the vertical plunging jet flow problem. The large-scale air-water interface is captured by the VOF method, and the microbubbles are modeled as Lagrange points. Special algorithms are designed to realize a smooth transformation between two frameworks. Results indicate that satisfactory multiscale two-phase flow capture accuracy can be achieved with high efficiency by using the new method.
{"title":"A Hybrid Volume-of-Fluid/Euler–Lagrange Method for Vertical Plunging Jet Flows","authors":"Xiao-song Zhang, Weiwen Zhao, D. Wan","doi":"10.17736/ijope.2022.jc838","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc838","url":null,"abstract":"The vertical plunging jet is a typical multiscale two-phase flow problem in which a large number of microbubbles are formed by the impingement of a liquid jet with a free surface. Traditional numerical simulation methods experience difficulty reproducing both the large-scale phase interface evolution and the small-scale microbubbles at the same time. In this paper, a hybrid volume-of-fluid (VOF)/Euler–Lagrange method is adopted to simulate the vertical plunging jet flow problem. The large-scale air-water interface is captured by the VOF method, and the microbubbles are modeled as Lagrange points. Special algorithms are designed to realize a smooth transformation between two frameworks. Results indicate that satisfactory multiscale two-phase flow capture accuracy can be achieved with high efficiency by using the new method.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44799934","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 : 2022-03-01DOI: 10.17736/ijope.2022.jc844
Wendi Liu, S. Longshaw, A. Skillen, D. Emerson, C. Valente, F. Gambioli
A multiphase FSI framework using only open-source software has been developed, utilising components able to run on high-performance computing platforms. A partitioned approach is employed, ensuring a separation of concerns (fluid, structure and coupling), allowing design flexibility and robustness while reducing future maintenance efforts. Multiphase FSI test cases have been simulated and compared with published results and show good agreement. Simulation of a model representing an elastic aircraft wing with a fluid (fuel) sloshing inside is presented. This demonstrates the ability of this multiphase FSI framework in simulating complex and challenging cases involving a free liquid surface.
{"title":"A High-performance Open-source Solution for Multiphase Fluid-Structure Interaction","authors":"Wendi Liu, S. Longshaw, A. Skillen, D. Emerson, C. Valente, F. Gambioli","doi":"10.17736/ijope.2022.jc844","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc844","url":null,"abstract":"A multiphase FSI framework using only open-source software has been developed, utilising components able to run on high-performance computing platforms. A partitioned approach is employed, ensuring a separation of concerns (fluid, structure and coupling), allowing design flexibility and robustness while reducing future maintenance efforts. Multiphase FSI test cases have been simulated and compared with published results and show good agreement. Simulation of a model representing an elastic aircraft wing with a fluid (fuel) sloshing inside is presented. This demonstrates the ability of this multiphase FSI framework in simulating complex and challenging cases involving a free liquid surface.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44179875","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 : 2022-03-01DOI: 10.17736/ijope.2022.jc849
Ningbo Zhang, S. Yan, Q. Ma, Xing Zheng
{"title":"A Smoothed Particle Hydrodynamics Framework for Interaction Between Ice and Flexible Pile","authors":"Ningbo Zhang, S. Yan, Q. Ma, Xing Zheng","doi":"10.17736/ijope.2022.jc849","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc849","url":null,"abstract":"","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41800149","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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