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Meshless generalized finite difference method with a domain-selection method for solving degenerate boundary problems

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engineering Analysis with Boundary Elements 2023年第1期152卷 185-193页

作者： Huang, Ji Lyu, Hong-Guan Fan, Chia-Ming Chen, Jiahn-Horng Naval Architecture and Shipping College Guangdong Ocean University Zhanjiang524088 China School of Ocean Engineering and Technology Sun Yat-sen University Zhuhai519082 China Doctoral Degree Program in Ocean Engineering Technology National Taiwan Ocean University Keelung20224 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung20224 Taiwan Shih Yen-Ping Center for Underwater Technology National Taiwan Ocean University Keelung20224 Taiwan National Academy of Marine Research Kaohsiung80661 Taiwan

This paper is dedicated to presenting a combined Generalized Finite Difference Method (GFDM) and Domain-Selection Method (DSM) approach for solving degenerate boundary problems which are usually encountered in engineering simulations. Compared with traditional Domain-Decomposition Method (DDM), the most critical advantage of the present GFDM-DSM is that it is entirely free from matching continuous boundary conditions for different parts of the fluid domain of interest, which is sometimes hard to perform for specific situations. Instead, the only prerequisite of the present GFDM-DSM is to identify which sub-domain each computational node belongs to, and then a linear algebraic system can be assembled according to the pattern of domain-selection. Four benchmarks are performed to validate the convergence and accuracy of the present GFDM-DSM. It is shown that the present GFDM-DSM holds satisfactory accuracy for solving degenerate boundary problems. In particular, the present DSM is a flexible strategy since it can be also combined with other localized domain-type meshless methods in practical applications. © 2023 Elsevier Ltd

关键词： Domain decomposition methods

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Applying reverse engineering principles on analysis of failures occurred in ship production

Applying reverse engineering principles on analysis of failu...

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SNAME Maritime Convention 2021, SMC 2021

作者： Karahan, Canberk Helvacioglu, Sebnem Helvacioglu, Ismail H. Türk Loydu Conformity Assessment Services Co. Istanbul Turkey Marine Engineering Program Istanbul Turkey Piri Reis University Faculty of Engineering Department of Naval Architecture and Marine Engineering Istanbul Turkey

In the current work, a new error evaluation methodology is introduced based on error analysis in ship production with reverse engineering data. The aim is to determine the errors and prevent or reduce the occurrence in other projects. First step is to compose a database of the errors;then, group the similar errors and calculate the Error Priority Number (EPN) by the evaluation of the predetermined criteria. The radar diagrams, which are suitable for representing a number of parameters having the same variables, were used to present the error groups in a simple way. The error groups were created on the diagram with the scores taken from the specific criteria. With the aid of the radar diagram, valuable information is given by presenting similarities and dissimilarities of these errors with other error groups. After examining the radar diagrams and evaluating the results, the cause and effect diagrams were prepared for these error groups from the field experts. Thus, the methodology should be customized for the shipyard to ensure maximum efficiency. © 2021 Society of naval Architects and marine Engineers (SNAME)

关键词： Shipyards

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Environmental sustainability criteria in the multi-oriented shipbuilding industry in Indonesia

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Australian Journal of Maritime and Ocean Affairs 2024年第4期16卷 410-430页

作者： Azhar, Ali Harahab, Nuddin Putra, Fadilla Kurniawan, Andi Department of Naval Architecture and Ship Building Faculty of Engineering and Marine Science Hang Tuah University Surabaya Indonesia Postgraduate Environmental Science Doctorate Program Brawijaya University Malang Indonesia

Preliminary studies have highlighted the potential of Indonesia's geographical, suprastructural, and infrastructural conditions to develop a strong shipbuilding industry, which is crucial for the success of the world maritime axis program and sea toll. However, despite high expectations, the industry faces challenges that threaten business sustainability, leading to bankruptcies. To assess business sustainability, it is essential to establish criteria and sub-criteria, which previous studies have overlooked, focusing only on technical and economic factors. Therefore, this research generally aims to develop and analyze environmentally friendly sustainable criteria in the multi-oriented shipyard industry so that it develops in accordance with the vision, mission, goals and strategies. The criteria development process involves identifying and reviewing relevant articles, classifying and refining the criteria, conducting expert validity testing, Pearson Product Moment validity testing, and reliability testing using the Alpha (Cronbach) method. The expert validity testing indicates that ‘people' received the highest average score of 4.67 among the criteria, and ‘infrastructure' scored the highest in the sub-criteria, with a score of 4.75. The validity testing with the Pearson Product Moment method demonstrates that the criteria and sub-criteria are valid and the reliability of 32 sub-criteria indicating their influence on promoting multi-oriented and environmentally sustainable shipbuilding industries. © 2023 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Indonesia Shipyard Industry SPSS software sustainability

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Structural Assessment Review of Type-C Independent Tank in LNG Bunkering Ship 1

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6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, ICE-SEAM 2019

作者： Muttaqie, Teguh Lee, Seung Geon Cho, Sang-Rai Sohn, Jung Min Department of Naval Architecture and Marine System Engineering Pukyong National University Busan48513 Korea Republic of Jakarta10340 Indonesia School of Naval Architecture and Ocean Engineering University of Ulsan Ulsan Korea Republic of Interdisciplinary Program Marine Convergence Design Pukyong National University Busan48513 Korea Republic of

ISBN: (数字)9789811544811

ISBN: (纸本)9789811544804

In recent years, Liquefied Natural Gas (LNG) becomes one of the most suitable solutions to fulfil world primary eco-friendly energy demand. Consequently, bunkering ship is designed to charge liquefied gas with the increasing need for natural gas. Due to the extremely dangerous and cryogenic cargo, the design of LNG bunkering ship requires very high-level structural design/analysis technologies rather than conventional ships. Therefore, this paper describes a general procedure of the structural safety assessment for the independent type C tank of LNG bunkering ship. It aims to present a complete procedure for strength evaluation of independent type C tank including hull strength assessment. © 2020, Springer Nature Singapore Pte Ltd.

关键词： FE analysis LNG bunkering ship LNG type C tank Structural assessment review

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Preliminary design of 5 GT fishing boat with electric motor propulsion for daily coast fisherman

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AIP Conference Proceedings 2024年第1期2710卷

作者： Muhammad Arif Budiyanto Muhamad Adnan Sriyadi Department of Mechanical Engineering Universitas Indonesia Depok Jawa Barat Indonesia Undergraduate Program of Naval Architecture and Marine Engineering Department of Mechanical Engineering Universitas Indonesia Depok Jawa Barat Indonesia

Indonesia is an archipelagic country with a large number of daily coastal fishermen. The majority of fishing boats use diesel as fuel, on the other hand, solar energy as a renewable energy source is widely available in countries that cross the equator. This paper aims to conduct a preliminary design of a 5 GT fishing boat’s use of solar panels as electric motor propulsion for daily coast fishermen. Based on field data processing, it was found that the appropriate fishing boat size was 10 m in length, 2.2 m in width, 1.1 m in height, and 0.55 m in the draft. The results of the design show that the electric motor propulsion fishing boat can operate optimally using solar energy is 7 hours with a sailing distance of 9 sea miles. These results can be used as a reference for the substitution of fossil fuels into renewable energy so that they can provide the benefits of low daily operating costs for daily coast fishermen.

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Effect of Nozzle Performance on the Ducted Propeller: A Benchmark-Simulation Study using OpenFOAM

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Transportation Research Procedia 2021年 55卷 645-652页

作者： Aldias Bahatmaka Aditya Rio Prabowo Dong-Joon Kim Daewoo Shipbuilding and Marine Engineering (DSME).Co.Ltd Geoje 53305 South Korea Interdiscplinary Program of Marine Convergence Design Pukyong National University Busan 48513 South Korea Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan 48513 South Korea

As the modernization of marine transportation, it should be needed the strategy to improve the marine vehicle performances. The propeller is one of the important parts which has a function as an actuator during the operation of marine transportation or vehicle. The propeller design and optimization are packages to gain the best performances, included for the ducted propeller. Since the Nozzle design is one of the crucial aspects that influences the efficiency of the propeller. In the present study, the nozzle design has been proposed by using moving the propeller location based on the percentage of duct length. The propeller and nozzle were modelled in Computer-Aided Design (CAD) program packages and was testing to predict the performance using the OpenFOAM computational fluid dynamics (CFD) with Reynold-Average Navier-Stokes (RANS) method. A Kaplan type propeller is selected with 19A duct. The ducted propeller is analyzed by the Moving Rotating Frame (MRF). The computational results are validated by comparing with the experimental value of J from 0.2 to 0.8. The reasonable results were produced such the thrust, torque and efficiency trends were in good agreement with experimental data. According to the analysis, it can be concluded that by increasing 3% the duct length of the thrust increases about 2.148%

关键词： Ducted propeller CFD RANS MRF OpenFOAM

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Gas Dispersion Analysis on the Open Deck Fuel Storage Configuration of the LNG-Fueled Ship 1

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6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, ICE-SEAM 2019

作者： Nubli, Haris Prabowo, Aditya Rio Sohn, Jung Min Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan48513 Korea Republic of Department of Mechanical Engineering Universitas Sebelas Maret Surakarta57126 Indonesia Department of Naval Architecture and Marine System Engineering Pukyong National University Busan48513 Korea Republic of

ISBN: (数字)9789811544811

ISBN: (纸本)9789811544804

The LNG (Liquefied Natural Gas) fueled ship is one of the solution to solve the emission of SOx and NOx in conventional maritime fuel. Despite the advantages, the LNG fuel is more dangerous due to their low flash point. The leakage of gas fuel is one of the threat of LNG-fueled vessel, due to its explosive characteristic. This study aims to establish the exclusion zone due to LNG dispersion. The analysis contained the potential leakage and gas dispersion along to the exposed area. A verified Computational Fluid Dynamics (CFD) analysis based on the time accuracy assumption using KFX software was performed to simulate the dynamic behavior of the vapor dispersion. The scenarios were categorized by the leak size, leak location, and mass flow rate. The required environment parameters, e.g., wind speed and wind directions were also considered. It is found that the behavior of dispersed vapor was strongly depending on the leak location and mass flow rate. Surprisingly, the environment parameter has slightly affected the distance of the vapor dispersion. According to these findings, to deliver risk mitigation in a gas leakage accident, the exclusion zone was provided. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Computational fluid dynamics Exclusion zone Gas dispersion analysis LNG-fueled ship

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Meshless generalized finite difference method with a domain-decomposition method for solving Helmholtz equation and its application to caisson resonance problems

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Ocean engineering 2023年 271卷

作者： Huang, Ji Lyu, Hong-Guan Chen, Jiahn-Horng Fan, Chia-Ming School of Naval Architecture and Maritime Guangdong Ocean University Zhanjiang524088 China School of Ocean Engineering and Technology Sun Yat-sen University Zhuhai519082 China Doctoral Degree Program in Ocean Engineering Technology National Taiwan Ocean University Keelung20224 Taiwan Shih Yen-Ping Center for Underwater Technology National Taiwan Ocean University Keelung20224 Taiwan National Academy of Marine Research Kaohsiung80661 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung20224 Taiwan

This paper aims at presenting a meshless Generalized Finite Difference Method (GFDM) for solving the Helmholtz equation. In particular, in order to tackle the problem where a fluid domain is divided into different parts by a thin-wall structure, a Domain-Decomposition Method (DDM) is introduced to prevent interactions between node pairs coming from different parts of the flow domain. Two rigorous benchmarks are performed to validate the convergence and accuracy of the present GFDM-DDM model. Furthermore, caisson resonance problems are also investigated and discussed based on the novel numerical tool. It is shown that the present GFDM-DDM model can provide satisfactory predictions for resonance modes in caisson resonance problems, and hence can be treated as a powerful numerical tool in ocean engineering design due to its accurate and efficient characteristics. © 2023 The Authors

关键词： Caissons

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Toward green and sustaianable ship recycling industry in Indonesia 6

Toward green and sustaianable ship recycling industry in Ind...

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6th International Conference on Ship and Offshore Technology - Indonesia: Developments marine Design, Construction and Operation, ICSOT Indonesia 2019

作者： Sunaryo Djatmiko, E.B. Kurt, R.E. Naval Architecture and Marine Engineering Study Program Universitas Indonesia Indonesia Department of Marine Engineering Institut Teknologi Sepuluh Nopember Indonesia Department of Naval Architecture Ocean and Marine Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9781713830368

The main aim of this project is to develop a sustainable, safe & environmentally sound ship recycling industry in Indonesia. As the world's largest archipelago state, it is essential for Indonesia to maintain a large fleet of ships to ensure sufficient sea transportation. However, after completing their operational life, all these ships are required to be dismantled. Currently, there is no proper understanding & infrastructure for 'Ship Recycling' in Indonesia yet. This lack of understanding causes serious contamination of the sea which results in harming the environment. Furthermore, the working conditions are extremely poor because the yards are not fit for purpose and workers are exposed to many hazards. Referring to International Maritime Organization’s Hong Kong Convention a project is carried out to preparing the process of establishing green and sustainable ship recycling industry in Indonesia by conducting gap analyses and proposing environmentally friendly ship recycling yard concept. © 2019: The Royal Institution of naval Architects.

关键词： Ships

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Electrical system design of solar-powered electrical water recreational and sport vessel 1

Electrical system design of solar-powered electrical water r...

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1st International Conference on Automotive, Manufacturing, and Mechanical engineering, IC-AMME 2018

作者： Sunaryo Shadu Imfianto, Pradhana Naval Architecture and Marine Engineering Study Program Department of Mechanical Engineering Universitas IDN Depok 16424 Indonesia

Indonesia is the world's largest archipelago with more than 17 000 islands, and the best marine tourism destination due to its beautiful beaches and underwater scenery, but Indonesia is also the most vulnerable country to be affected by climate change due to the greenhouse effect. Besides industry, the transportation sector is the highest contributor to the global greenhouse effect. In order to reduce the source of the greenhouse effect, the Indonesian Government has committed to using new and renewable energy as an alternative to fossil-based fuel. In an attempt to contribute to the Government's efforts and to advance the national marine tourism, the research is aimed to design water recreational and sport vessel that powered by a solar generated electric engine, as further development of Universitas Indonesia's solar boat participated in International Solar-boat Challenge competition in the Netherlands. The research is focused on the effective use of solar energy as the main source for powering the vessel's electrical engine, based on the existing optimum shape and dimensions of the boat. Information and data regarding the arrangement of the vessel, solar electric generation processes and vessel powering system obtained from literature study, discussion with experts, and on the spot surveys of various recreational vessels were used as input for the calculation and simulation of the vessel being investigated. The research results are expected could be further developed for other related usages such as fish farming, coastal fishing rig, floating restaurant, etc. © 2019 The Authors, published by EDP Sciences.

关键词： Greenhouse effect

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