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17th International Congress of the International Maritime Association of the Mediterranean, IMAM 2017

作者： Samuel, S. Kim, D.-J. Iqbal, M. Bahatmaka, A. Prabowo, A.R. Department of Naval Architecture and Marine Systems Engineering Pukyong National University Korea Republic of Department of Naval Architecture Diponegoro University Indonesia Interdisciplinary Program of Marine Design Convergence Pukyong National University Korea Republic of

ISBN: (纸本)9780815379935

Traditional fishermen in Cilacap modify a monohull fishing vessel to be a catamaran. With the same draft, the capacity increases two times while the resistance increases almost four times than original monohull due to low S/L. The wave interference between hulls caused by low S/L increases the wave resistance leading to fuel consumption problem. This paper offers one of the solutions to overcome this problem by placing a centerbulb. The position of centerbulb is configured to get the lowest total resistance. The total resistance was analyzed using empirical formula and solved by a computational fluid dynamics (CFD) software. The results show that centerbulb configuration reduces the total resistance up to 25.76%. This is good news for the fishermen in Cilacap to modify their catamaran by adding centerbulb. © 2018 Taylor & Francis Group, London.

关键词： Computational fluid dynamics

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Bulbous bow applications on a catamaran fishing vessel for improving performance 2

Bulbous bow applications on a catamaran fishing vessel for i...

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2nd International Joint Conference on Advanced Engineering and Technology, IJCAET 2017 and International Symposium on Advanced Mechanical and Power Engineering, ISAMPE 2017

作者： Samuel Kim, Dong-Joon Iqbal, Muhammad Bahatmaka, Aldias Rio Prabowo, Aditya Department of Naval Architecture and Marine Systems Engineering Pukyong National University Korea Republic of Department of Naval Architecture Diponegoro University Indonesia Department of Interdisciplinary Program of Marine Design Convergence Pukyong National University Korea Republic of

This study aims to prove the usefulness of a bulbous bow traditional catamaran fishing vessel. Bulbous bow applications are widely used to reduce wave resistance. The fishing vessel resistance was calculated using CFD (Computational Fluid Dynamic) approach and combined with classical slender body theory. In this research, the application of bulbous bow was being adopted on traditional catamaran fishing vessel to reduce the total resistance. The bulbous bow has adopted based on Kracht method. Modeling procedure was developed by using linear form coefficients. The ship resistance was simulated using Tdyn software which basically Finite Element Method. The results show that adding bulbous bow can decrease or increase the ship's total resistance. © The Authors, published by EDP Sciences, 2018.

关键词： Fisheries

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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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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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Analysis of structural crashworthiness on a non-ice class tanker during stranding accounting for the sailing routes 17th

Analysis of structural crashworthiness on a non-ice class ta...

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17th International Congress of the International Maritime Association of the Mediterranean, IMAM 2017

作者： Prabowo, A.R. Bahatmaka, A. Cho, J.H. Sohn, J.M. Bae, D.M. Samuel, S. Cao, B. Interdisciplinary Program of Marine Convergence Design Pukyong National University Pusan Korea Republic of Department Naval Architecture and Marine Systems Engineering Pukyong National University Pusan Korea Republic of Department Naval Architecture Diponegoro University Semarang Indonesia China Shipbuilding Industry Corporation Economic Research Center Beijing China

ISBN: (纸本)9780815379935

Certain ships are built with capability to survive in voyage through the North Sea Route. However, non-ice class ship especially tankers should be given adequate attention accounting for its behavior when accidental loads are experienced, e.g. stranding. Aim of this paper is to estimate structural behavior of a non-ice class tanker during stranding. Failure and damage extent of the ship were assessed to provide reference data regarding countermeasure and casualty estimations for further study. In this study, a chemical tanker was modelled to be the target ship in a series of stranding scenario model. Condition of the structural damage and tendency of crashworthiness criteria, namely: rupture energy, crushing force and structural acceleration were observed. The results indicated that the lateral impact was capable to produce higher extent of damage on the bottom structure than the frontal impact. Finally, recommendation of the ice class material’s application on marine structures is summarized. © 2018 Taylor & Francis Group, London.

关键词： Damage detection

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Structural analysis for estimating damage behavior of double hull under ice-grounding scenario models 16th

Structural analysis for estimating damage behavior of double...

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16th International Conference on Fracture and Damage Mechanics, 2017

作者： Prabowo, Aditya Rio Sohn, Jung Min Byeon, Jung Hoon Bae, Dong Myung Zakki, Ahmad Fauzan Cao, Bo Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan48513 Korea Republic of Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan48513 Korea Republic of Department of Naval Architecture Diponegoro University Semarang50268 Indonesia China Shipbuilding Industry Corporation Economic Research Center Beijing100012 China

ISBN: (纸本)9783035711684

Demand to increase safety for water transportation, namely ship is continuously rising as various accidental loads may threat condition of target structure, i.e. ship. Several possibilities of impact scenario can occur with various indenters, for example stranding to a grounded ice. In this work, a study of structural behaviour accounting for interaction between the ship structure and indenter is conducted. Numerical simulation is performed using finite element method to estimate damage extent of the double bottom. In analysis, the indenter for grounding scenario is applied by characteristic of the ice properties to obtain estimated response of the structure in experiencing impact on polar territory. Impact scenario is defined into three different locations, namely girder and space between two girders. Finally, tendency of the damage per destroyed component is summarized. © 2017 Trans Tech Publications, Switzerland.

关键词： Ice

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Verification of CFD Method for Meshing Analysis on the Propeller Performance with OpenFOAM

Verification of CFD Method for Meshing Analysis on the Prope...

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International Conference on Computing, Electronics & Communications Engineering (iCCECE)

作者： Aldias Bahatmaka Dong-Joon Kim Yongxing Zhang Interdisciplinary program of Marine Convergence Design Pukyong National University Busan Republic of Korea Dept. of Naval Architecture and Marine Systems Engineering Pukyong National University Busan Republic of Korea

ISBN: (纸本)9781538649053;9781538649046

This paper inspects the capability if using the Computational Fluid Dynamics (CFD) tools to investigate the effect of free surface with marine propeller. We conducted the numerical simulation for propeller performance on the open-water test. The numerical simulations were compared the meshing strategies for the propeller. The simulations show that effect on the thrust and torque. The OpenFOAM was applied to solve the propeller problem, where open water performances of propeller (KP505) is estimated by a Reynold-average Navier-Stokes equations (RANS) solver which is using the three-dimensional unsteady incompressible viscous flow and using the turbulence of k-Omega SST. For the mesh generation, unstructure meshes used in the numerical simulation with hexahedral meshing. The Arbitrary mesh strategy (AMI) and Multiple Rotating Frame (MRF) were compared to define the best meshing. The meshing strategies were selected in 3 categories, e.g coarse, medium, and fine mesh. Thus, the propeller can be performed in the best mesh. The numerical results were validated with the experimental data. The KT, KQ, and Efficiency of the propeller were compared to an experimental result and for all of the meshing strategies. Thus, the simulations show the influence of meshing in order to perform the propeller performance.

关键词： Propellers Mathematical model Numerical models Blades Oceans convergence Computational fluid dynamics

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Investigation on the Structural Damage of a Double-Hull Ship, Part I – Ship Collision

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Procedia Structural Integrity 2017年 5卷 935-942页

作者： Aditya Rio Prabowo Seung Jun Baek Jung Hoon Byeon Dong Myung Bae Joung Hyung Cho Jung Min Sohn Interdisciplinary Program of Marine Convergence Design Nam-gu Yongso-ro 45 Daeyeon-dong Busan 48513 South Korea Department of Naval Architecture and Marine Systems Engineering Nam-gu Yongso-ro 45 Daeyeon-dong Busan 48513 South Korea

marine structure is designed to be able to resist various load conditions during its operational period. However, in design process, analysis of accidental loads, such collision and grounding, has not been included for both merchant ship and navy vessel. These loads are spontaneous and several remarkable casualties may occur after collision and grounding taking place. The aim of this paper is to investigate structural damage on the target ship during collision and grounding considering on failure process and damage extent. This work is divided into two parts which in the Part I, ship collision is discussed, and the Part II deals with interaction of ship structure with sea bottom in grounding. In the Part I - Ship Collision, condition of the side structure is observed, including the inner hull after impact which is considered as the key to determine safety condition of ship cargo. A passenger ship is modelled in this work and designated as the struck ship which will be struck by the striking ship in collision process. Resistance capability of the double-hull structure against side collision is evaluated. Virtual experiment is conducted by nonlinear finite element method in order to calculate several dynamic collision scenarios which are built based on physical parameter, namely target location. Based on calculation results, damage on the side hull is found to be highly influenced by relative height between two ships prior collision. Crashworthiness criteria are summarized and result tendency indicates that in the mentioned location, the striking ship produces larger tearing on the lower part of the struck ship. Contribution of each collision scenario on the resultant force is presented in later part in order to observe structural behaviour of each determined location in encountering side collision.

关键词： Impact phenomenon ship collision non-linear FEM damage extent internal energy

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Investigation on the Structural Damage of a Double-Hull Ship, Part II – Grounding Impact

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Procedia Structural Integrity 2017年 5卷 943-950页

作者： Aditya Rio Prabowo Hyun Jin Cho Seung Geon Lee Dong Myung Bae Jung Min Sohn Joung Hyung Cho Interdisciplinary Program of Marine Convergence Design Nam-gu Yongso-ro 45 Daeyeon-dong Busan 48513 South Korea Department of Naval Architecture and Marine Systems Engineering Nam-gu Yongso-ro 45 Daeyeon-dong Busan 48513 South Korea

Possibility of marine and offshore structures to experience accidental loads has been seriously considered up to this day. Remarkable casualties on related aspects are rising demand to ensure ship safety which in this subject is observed on marine structure. Ship is an example of marine structure that may be subjected to accidental loads during its operation. The aim of this paper is to investigate damage extent of the target ship under different accidental loads, namely collision and grounding with considerations to failure process and deformation contours. This work is divided into two parts which in the Part I, ship collision is discussed, and the Part II deals with interaction of ship structure with sea bottom in grounding. In Part II - Grounding impact, evaluating tearing damage on the bottom structure is essential in estimating environmental casualties caused by oil leakage. A chemical tanker is modelled to be the target ship in a series of grounding scenarios. Condition of the structural damage and tendency of the internal energy, crushing force and structural acceleration are observed. Prediction of the tearing opening and location of the initial failure in further grounding process are also presented in this paper. Virtual experiment is conducted by nonlinear finite element method in order to calculate the defined grounding scenarios which are built based on the target location on the bottom structure. Based on calculation results, condition of the double-hull structure after grounding is found to be highly influenced by arrangement of the longitudinal members which is evidenced by the fact that these members provide higher resistance than the transverse part. Finally, influence of the indenter's position on structural responses in grounding is summarized.

关键词： Impact phenomenon grounding impact numerical simulation structural damage collision force

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Energy Dissipation of Ship Structures subjected to Impact Loading: A Study Case in Side Collision

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Procedia Structural Integrity 2020年 27卷 171-178页

作者： Aditya Rio Prabowo Haris Nubli Jung Min Sohn Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan 48513 South Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan 48513 South Korea

The main goal of the present paper is to study the energy dissipation characteristic as the influence of parameters in the event of ship collisions. The review is conducted on accident case between Roll on-Roll off (Ro-Ro) Marisa Nusantara with Reefer Qi Hang at Sunda Strait, Indonesia May 3rd, 2014, as reference. It was later modeled and analyzed by nonlinear simulations finite element (FE) method was presented to be used as a reference to get the verified model. This collaboration study is considered as a good reference because it used real accident damage to compare the numerical results. The result in collision energy from the virtual simulation was later verified with the calculation result of the empirical formula. In the extended study, the collision region and material model are selected as influenced parameters to design collision scenarios. The characteristic of collision energy from these scenarios will be discussed. In the same section, the damage pattern is observed and reviewed to find the relation between several parameters to calculation results. It was shown that the influence of region and location of target points contributed significantly to energy dissipation. In contrast, the key finding in material properties is that when Young’s modulus between materials was the same and the difference of yield strength of materials was not significant, then other material properties contributed to the result.

关键词： Accidental loads ship collision Ro-Ro vessel double-hull structures crashworthiness energy dissipation

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