Pub Date : 2022-06-01DOI: 10.17736/ijope.2022.jc853
V. A. Korshunov, R. Mudrik, Dmitry A Ponomarev, Alexander A Rodionov, D. V. Nikushchenko, K. Kornishin, Yaroslav Efimov, A. Chernov, I. Svistunov
This paper describes a mathematical model of iceberg towing that considers an iceberg’s shape in an explicit form. The developed model allows for the analysis of oscillations appearing in towing systems in both stationary and dynamic modes. The proposed numerical model can be used to assess the nonlinear dynamics of the “vessel-rope-iceberg” system. An understanding of the peak values in the tow force should help to increase iceberg towing efficiency and ensure the safety of operations as a result of reduced iceberg roll and rope slide-off.
{"title":"Oscillations During Iceberg Towing","authors":"V. A. Korshunov, R. Mudrik, Dmitry A Ponomarev, Alexander A Rodionov, D. V. Nikushchenko, K. Kornishin, Yaroslav Efimov, A. Chernov, I. Svistunov","doi":"10.17736/ijope.2022.jc853","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc853","url":null,"abstract":"This paper describes a mathematical model of iceberg towing that considers an iceberg’s shape in an explicit form. The developed model allows for the analysis of oscillations appearing in towing systems in both stationary and dynamic modes. The proposed numerical model can be used to assess the nonlinear dynamics of the “vessel-rope-iceberg” system. An understanding of the peak values in the tow force should help to increase iceberg towing efficiency and ensure the safety of operations as a result of reduced iceberg roll and rope slide-off.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45807315","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.jc850
K. Kornishin, Yaroslav Efimov, D. V. Nikushchenko, Dmitriy S Khmara, N. Tryaskin, A. Andreev, A. A. Skutin, K. Smirnov
This article examines iceberg movement under the influence of wind-force, with detailed analysis of the influence of iceberg shape (both keel and sail) on the parameters of this movement. For four icebergs, studied during trials in 2016– 2017, hydrodynamic characteristics of keels and sails were determined by means of numerical and basin modeling. For these icebergs, orientation, direction, and speed of movement were calculated for different wind speeds and directions. Regression between the maximum value of the hydrodynamic drag coefficient and the geometric parameters is built based on the studied shape of sails of 10 icebergs. A formula for calculating the wind load on an iceberg depending on the parameters of its topside and a formula for calculating the drift speed of icebergs less than 75 meters long are proposed. The formulas are applied to icebergs of the southwestern part of the Kara Sea, which made it possible to estimate their drift speed and wind load under the influence of wind. The obtained results can be used in the modeling of the iceberg drift, as well as for assessing the wind impact during iceberg towing.
{"title":"Effect of Iceberg Shape on Wind-force Parameters","authors":"K. Kornishin, Yaroslav Efimov, D. V. Nikushchenko, Dmitriy S Khmara, N. Tryaskin, A. Andreev, A. A. Skutin, K. Smirnov","doi":"10.17736/ijope.2022.jc850","DOIUrl":"https://doi.org/10.17736/ijope.2022.jc850","url":null,"abstract":"This article examines iceberg movement under the influence of wind-force, with detailed analysis of the influence of iceberg shape (both keel and sail) on the parameters of this movement. For four icebergs, studied during trials in 2016– 2017, hydrodynamic characteristics of keels and sails were determined by means of numerical and basin modeling. For these icebergs, orientation, direction, and speed of movement were calculated for different wind speeds and directions. Regression between the maximum value of the hydrodynamic drag coefficient and the geometric parameters is built based on the studied shape of sails of 10 icebergs. A formula for calculating the wind load on an iceberg depending on the parameters of its topside and a formula for calculating the drift speed of icebergs less than 75 meters long are proposed. The formulas are applied to icebergs of the southwestern part of the Kara Sea, which made it possible to estimate their drift speed and wind load under the influence of wind. The obtained results can be used in the modeling of the iceberg drift, as well as for assessing the wind impact during iceberg towing.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42823110","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.ak46
R. Kurnia, E. V. van Groesen
This paper describes a numerical implementation of a Hamiltonian Boussinesq wave-body interaction for irrotational flow as formulated in van Groesen and Andonowati (2017), with a restriction of one horizontal coordinate and a cross section of the body. Part of the HAWASSI (Hamiltonian Wave-Ship-Structure Interaction) software we developed allows for numerical discretisation of the surface waves using spectral methods. Non-smooth effects from the body-fluid interaction are included in the design of a virtual wave in the body area, which is determined by the boundary conditions on the body hull. Except for a comparison with standard cases in the literature, the performance of the code is shown by comparison with measurements of an experiment on the slow-drift motion of a rectangular barge moored above a sloping beach and interacting with irregular waves, in the barge beam direction, including the infra-gravity waves from the runup on the shore.
{"title":"Hamiltonian Boussinesq Simulation of Wave-Body Interaction Above Sloping Bottom","authors":"R. Kurnia, E. V. van Groesen","doi":"10.17736/ijope.2022.ak46","DOIUrl":"https://doi.org/10.17736/ijope.2022.ak46","url":null,"abstract":"This paper describes a numerical implementation of a Hamiltonian Boussinesq wave-body interaction for irrotational flow as formulated in van Groesen and Andonowati (2017), with a restriction of one horizontal coordinate and a cross section of the body. Part of the HAWASSI (Hamiltonian Wave-Ship-Structure Interaction) software we developed allows for numerical discretisation of the surface waves using spectral methods. Non-smooth effects from the body-fluid interaction are included in the design of a virtual wave in the body area, which is determined by the boundary conditions on the body hull. Except for a comparison with standard cases in the literature, the performance of the code is shown by comparison with measurements of an experiment on the slow-drift motion of a rectangular barge moored above a sloping beach and interacting with irregular waves, in the barge beam direction, including the infra-gravity waves from the runup on the shore.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41491881","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":" ","pages":""},"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}
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":" ","pages":""},"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}
Rectangular foundations are employed as an emerging solution to support jack-up platforms, where the impact of changes in foundation shape and size compared to traditional circular foundations needs to be explicitly considered. However, few recent studies have addressed this topic. Therefore, this paper reports the deep penetration behavior of rectangular foundations in kaolin and silty clays based on centrifuge experiments and particle image velocimetry (PIV) techniques. The flow back of the soil is found to be complicated by the nonaxisymmetric characteristic of the rectangular spudcan. Sensitivity is the most critical factor affecting the flow state and bearing capacity response of different clays, and some discrepancies exist between the experimental bearing capacity results and the predicted values of the classical methods.
{"title":"Deep Penetration of Rectangular Spudcan into Single-Layer Clay","authors":"Dongshi Wang, Lindong Fan, Fei Wang, Menglan Duan, Jinjiang Wang, S. Gao","doi":"10.17736/ijope.2022.cl19","DOIUrl":"https://doi.org/10.17736/ijope.2022.cl19","url":null,"abstract":"Rectangular foundations are employed as an emerging solution to support jack-up platforms, where the impact of changes in foundation shape and size compared to traditional circular foundations needs to be explicitly considered. However, few recent studies have addressed this topic. Therefore, this paper reports the deep penetration behavior of rectangular foundations in kaolin and silty clays based on centrifuge experiments and particle image velocimetry (PIV) techniques. The flow back of the soil is found to be complicated by the nonaxisymmetric characteristic of the rectangular spudcan. Sensitivity is the most critical factor affecting the flow state and bearing capacity response of different clays, and some discrepancies exist between the experimental bearing capacity results and the predicted values of the classical methods.","PeriodicalId":50302,"journal":{"name":"International Journal of Offshore and Polar Engineering","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46785339","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":" ","pages":""},"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":" ","pages":""},"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":" ","pages":""},"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":" ","pages":""},"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}
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