권호 표지

Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)

  • Bimonthly
  • /
  • 1225-0767(pISSN)
  • /
  • 2287-6715(eISSN)

Domain

  • Construction/Transportation ＞ Maritime Safety/Transportation Technology
  • Construction/Transportation ＞ Water Engineering System

Aim & Scope

Journal of Ocean Engineering and Technology provides a medium for the publication of original research and development technology in marine/material science and engineering which include: Ocean Engineering; Coastal Engineering; Naval Architecture; Offshore Technology; Frontier Energy Resources Technology; Marine Renewable Energy; Underwater Vehicles and Robotics; Underwater Acoustics and Sonar Technology; Underwater Observation Systems; Underwater Communication and Technology; Marine Equipments; Remote Sensing of Air/Ocean Surface; Ocean Mining; Offshore Mechanics; Marine Hydrodynamics and CFD; Sloshing Dynamics and Design; Vortex-induced Vibration; Cable, Mooring, Buoy Technology; Fluid-Structure Interaction; Hydroelasticity; Risk and Limit State Design and Assessment; Ship Maneuvering; Seakeeping and Control Systems; Ship Resistance and Propulsion; Port and Waterfront Design and Engineering; Geotechnology; Satellite Observation; Shore Protection; Beach Nourishment; Sediment Transport; Mechanics; Safety and Reliability; Subsea; Pipelines; Risers and Positioning; High-Performance Materials; Nano-technologies for Clean Energy; Friction Stir Welding for Oil and Gas; Arctic Materials; Arctic Science and Technology; Advanced Ship Technology; Naval and Offshore Structures and Technology; and Oceanography.

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Volume 33 Issue 4

  1. Shi, XiangYu;Zhang, Yang;Yum, Deuk-joon 313
    https://doi.org/10.26748/KSOE.2019.061 PDF
    The prediction of the hydrodynamic performance of a planing hull vessel is an important and challenging topic for computational fluid dynamic (CFD) applications to naval hydrodynamics. In this paper, the resistance and planing attitude analysis for a Fridsma hull, which is a prismatic planing hull, in still water are numerically studied using OpenFOAM. OpenFOAM is an open source code package based on C++ libraries and the finite volume method (FVM) for the discretization of the RANS equation. The volume of fluid method (VOF) is used to capture the water-air interface and the SST ${\kappa}-{\omega}$ model is used for the turbulence simulation. The overset mesh method is used to capture the large motion of the hull at higher speeds. Before the extensive analysis, uncertainty analyses using various time steps and grid sizes were performed for one ship speed case of Fn = 1.19. The results of the present study are compared with those of a model test, other CFD research, and Savitsky's empirical formula. The results of the present study, following the trend of other CFD results, slightly over predict the resistance and under predict the sinkage and, more significantly, the trim.
  2. Park, Byeongwon;Jung, Dong Woo;Jung, Jaesag;Park, Inbo;Cho, Seok-Kyu;Sung, Hong Gun 322
    https://doi.org/10.26748/KSOE.2019.004 PDF
    The magnitude of the roll motion of a floating structure depends on the roll damping acting on the body. In other words, the roll damping of a floating structure must be accurately obtained in order to precisely evaluate the roll motion. Various methods are used to evaluate the roll damping of a floating structure, such as the linear potential theory, computational fluid dynamics (CFD), and model tests. However, it is difficult to evaluate the roll motion of a floating structure with appendages such as a bilge keel and riser slot due to the limitation of ignoring the viscous effects in the linear potential theory. Among these methods, a model test based on a free decay test and harmonic excited roll motion (HERM) is known to be the most reliable method to estimate the roll damping of the floating structures. In this study, model tests using free decay and HERM techniques were performed in the Ocean Engineering Basin (OEB) of KRISO with various types of midship sections. The roll damping results were estimated based on post-processing methods using both techniques, and the roll damping results were compared.
  3. Kim, Bong Ju 330
    https://doi.org/10.26748/KSOE.2019.039 PDF
    Radiant heat shields are normally installed on offshore oil and gas platforms to protect personnel, equipment, and structures from the thermal radiation emitted by a flare system. A heat shield should be individually designed to reduce the thermal radiation to the target level, and then manufactured and installed after the performance verification. However, in general, a heat shield is designed and manufactured by trial and error based on the performance test. For this reason, it is difficult to develop and design radiant heat shields in the Korean shipbuilding and marine equipment industry because of the lack of performance test data and limited experience. In the present study, the results of experiments conducted to verify the performances of radiant heat shields were analyzed, and the thermal radiation characteristics and performance characteristics of the radiant heat shields were investigated. The insights and conclusions developed in the present study will be useful in terms of the design and development of radiant heat shield, as well as in their performance verification tests.
  4. Park, Woo-Chang;Song, Chang Yong 340
    https://doi.org/10.26748/KSOE.2019.027 PDF
    In the case of a fire accident on a ship or an offshore plant, the design of the bulkhead penetration piece must be verified via a fire test procedure (FTP), as specified by the Maritime Safety Committee (MSC). The purpose of this study is to verify both the numerical analysis results and the design specifications for penetration pieces that could be applied to the A60 class bulkhead division. In this study, the FTP was carried out in accordance with the test procedure prescribed in the MSC regulation. In order to review the fire resistance performance according to the material type, bulkhead penetration pieces for the FTP were made from brass, carbon steel for machine structures (S45C), and austenite stainless steel (SUS316). In addition, spray-type insulation and mechanical fastener-type insulation were applied to investigate the fire resistance performance according to the type of insulation. To verify the heat transfer numerical analysis results for the A60 class bulkhead penetrating piece from this test study, the design specifications of the penetrating piece material and the insulation type applicable to a ship and an offshore plant were identified.
  5. Lim, Jae Hwan;Jo, Hyo Jae;Hwang, Jae Hyuk;Kim, Jae Heui;Lee, Tae Kyung;Choi, Yoon Woo;Lee, Min Jun;Kim, Young Kyu 350
    https://doi.org/10.26748/KSOE.2019.028 PDF
    The development of marine technology is expected to increase the demand for marine plants because of increasing oil prices. Therefore, there is also expected to be an increase in the demand for cylindrical structures such as URF (umbilical, riser, flowline) structures and spars, which are used operating in various seas. However, a cylindrical structure experiences vortex induced motion (VIM) in a current. In particular, for risers and umbilicals, it is important to identify the characteristics of the VIM because interference between structures can occur. In addition, various studies have been conducted to reduce VIM because it is the cause of fatigue damage to structures. The helical strake, which was developed for VIM reduction, has an excellent VIM reduction performance, but is difficult to install on structures and has a negative effect on heave motion. Therefore, the purpose of this study was to supplement the shortcomings of the helical strake and develop a high-performance reduction device. In the reduction device developed in this study, a string is placed around the structure inside the flow, causing vibration. The vibration of this string causes a small turbulence in the flow field, reducing the VIM effect on the structure. Finally, in this study, the 2-DOF motion characteristics of models without a suppression device, models with a helical strake, and models with a string were investigated, and their reduction performances were compared through model tests.
  6. Kim, Kookhyun 358
    https://doi.org/10.26748/KSOE.2019.040 PDF
    The acoustic power is used as a primary index characterizing underwater sound sources and could be defined by its source level. The source level has been assessed using various experimental techniques such as the reverberation time method and reverberant tank plot method. While the reverberation time method requires reverberation time data extracted in a preliminary experiment in a reverberant water tank, the reverberant tank plot method only needs acoustic pressure data directly obtained at the reverberation water tank. In this research, these experimental techniques were studied in comparative experiments to estimate the source levels of underwater sources in a reverberant water tank. This paper summarizes the basic theories and procedures of these experimental techniques and presents the experimental results for an underwater source in a long cuboid water tank using each technique, along with a discussion.
  7. Lee, Woo-Dong;Jeong, Yeon-Myeong;Choi, Kyu-Nam;Hur, Dong-Soo 364
    https://doi.org/10.26748/KSOE.2019.002 PDF
    When underwater blasting is conducted, both shock waves and water waves have an effect on adjacent coastal areas. In this study, an empirical formula for estimating the details of water waves caused by underwater blasting was applied to a non-reflected wave generation system, and a 3D numerical wave tank (NWT) was improved to reproduce the generation and propagation of such water waves. The maximum elevations of the propagated water waves were comparatively analyzed to determine the validity and effectiveness of the NWT. Good agreement was demonstrated between the empirical and simulation results. The generation and propagation of water waves were also simulated under each underwater blasting scenario for the removal of the Todo islet at the Busan Newport International Terminal (PNIT). It was determined that the water waves generated by the underwater blasting scenario examined in this study did not have a significant impact on the PNIT. In addition, multiple-charge blasting caused higher wave heights than single-charge blasting. As the amount of firing charge increased, the wave height also increased. Finally, larger water waves were generated during the later blasting conducted at a deeper depth as compared with an earlier blasting conducted at a relatively shallow depth.