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In this paper, the efficiency of Propeller Boss Cap Fins (PBCF) installed at the bulk carrier was estimated under both Propeller Open Water (POW) and self-propulsion conditions. For this estimation, virtual model-basin tests (resistance, POW, and self-propulsion tests) were conducted through Computational Fluid Dynamics (CFDs) simulation. In the resistance test, the total resistance and the wake distribution according to ship speed were investigated. In the POW test, changes of thrust, torque coefficient, and open water efficiency on the propeller according to PBCF installation were investigated. Finally, the International Towing Tank Conference (ITTC) 1978 method was used to predict the effect of PBCF installation on self-propulsive coefficient and brake horsepower. For analyzing incompressible viscous flow field, the Reynolds-Averaged Navier–Stokes (RANS) equation with SST k-ω turbulence model was calculated using Star-CCM+ 11.06.010-R8. All simulation results were validated by comparing the results of model tests conducted at the Korea Research Institute of Ships and Ocean Engineering (KRISO). Consequently, for the self-propulsion test with the PBCF, a 1.5% reduction of brake horsepower was estimated in the simulation and a 0.5% reduction of the brake horsepower was estimated in the experiment.
Dong-Hyun Kim; Jong-Chun Park; Gyu-Mok Jeon; Myung-Soo Shin. CFD Simulation for Estimating Efficiency of PBCF Installed on a 176K Bulk Carrier under Both POW and Self-Propulsion Conditions. Processes 2021, 9, 1192 .
AMA StyleDong-Hyun Kim, Jong-Chun Park, Gyu-Mok Jeon, Myung-Soo Shin. CFD Simulation for Estimating Efficiency of PBCF Installed on a 176K Bulk Carrier under Both POW and Self-Propulsion Conditions. Processes. 2021; 9 (7):1192.
Chicago/Turabian StyleDong-Hyun Kim; Jong-Chun Park; Gyu-Mok Jeon; Myung-Soo Shin. 2021. "CFD Simulation for Estimating Efficiency of PBCF Installed on a 176K Bulk Carrier under Both POW and Self-Propulsion Conditions." Processes 9, no. 7: 1192.
Tae-Young Kim; Gyu-Mok Jeon; Jong-Chun Park. CFD Simulation of Multiphase Flow by Mud Agitator in Drilling Mud Mixing System. Journal of Ocean Engineering and Technology 2021, 35, 121 -130.
AMA StyleTae-Young Kim, Gyu-Mok Jeon, Jong-Chun Park. CFD Simulation of Multiphase Flow by Mud Agitator in Drilling Mud Mixing System. Journal of Ocean Engineering and Technology. 2021; 35 (2):121-130.
Chicago/Turabian StyleTae-Young Kim; Gyu-Mok Jeon; Jong-Chun Park. 2021. "CFD Simulation of Multiphase Flow by Mud Agitator in Drilling Mud Mixing System." Journal of Ocean Engineering and Technology 35, no. 2: 121-130.
Soh-Myung Chung; Yong-Seok Seo; Gyu-Mok Jeon; Jae-Won Kim; Jong-Chun Park. Parameter Study of Boiling Model for CFD Simulation of Multiphase-Thermal Flow in a Pipe. Journal of Ocean Engineering and Technology 2021, 35, 50 -58.
AMA StyleSoh-Myung Chung, Yong-Seok Seo, Gyu-Mok Jeon, Jae-Won Kim, Jong-Chun Park. Parameter Study of Boiling Model for CFD Simulation of Multiphase-Thermal Flow in a Pipe. Journal of Ocean Engineering and Technology. 2021; 35 (1):50-58.
Chicago/Turabian StyleSoh-Myung Chung; Yong-Seok Seo; Gyu-Mok Jeon; Jae-Won Kim; Jong-Chun Park. 2021. "Parameter Study of Boiling Model for CFD Simulation of Multiphase-Thermal Flow in a Pipe." Journal of Ocean Engineering and Technology 35, no. 1: 50-58.
In the present study, the model-scale Propeller Open Water (POW) tests for the propeller of 176K bulk carrier and 8600TEU container ship were conducted through Computational Fluid Dynamics (CFD) simulation. In order to solve the incompressible viscous flow field, the Reynolds-averaged Navier-Stokes (RaNS) equations were employed as the governing equations. The γ-Reθ(gamma-Re-theta) transition model combined with the SST k-ωturbulence model was introduced to describe the laminar-turbulence transition considering the low Reynolds number of model-scale. Firstly, the flow simulation developing over a flat plate was performed to verify the transition modeling, in which the wall shear stresses were compared with experiments and other numerical results. Then, to investigate the effect of the model, the CFD simulation for the POW test was performed and the simulated propeller performance was validated through comparison with the experiment conducted at Korea Research Institute of Ships & Ocean Engineering (KRISO).
Dong-Hyun Kim; Gyu-Mok Jeon; Jong-Chun Park; Myung-Soo Shin. CFD Simulation on Predicting POW Performance Adopting Laminar-Turbulent Transient Model. Journal of the Society of Naval Architects of Korea 2021, 58, 1 -9.
AMA StyleDong-Hyun Kim, Gyu-Mok Jeon, Jong-Chun Park, Myung-Soo Shin. CFD Simulation on Predicting POW Performance Adopting Laminar-Turbulent Transient Model. Journal of the Society of Naval Architects of Korea. 2021; 58 (1):1-9.
Chicago/Turabian StyleDong-Hyun Kim; Gyu-Mok Jeon; Jong-Chun Park; Myung-Soo Shin. 2021. "CFD Simulation on Predicting POW Performance Adopting Laminar-Turbulent Transient Model." Journal of the Society of Naval Architects of Korea 58, no. 1: 1-9.
The purpose of the study is the high-precision, numerical calculation of the Boil-off-Gas (BOG) and Boil-off-Rate (BOR) of cryogenic liquid for the design of containment cargo system (CCS) by using high-fidelity multi-physics CFD simulation of heat transfer of insulation system and phase change of multiphase-thermal flow in the cryogenic liquid tank. The results are compared with those predicted by the conventional low-fidelity methods which are based only on the total heat transfer and does not consider detailed physics related to the phase change of the cryogenic liquid in the storage tank. The unsteady Reynolds-averaged Navier-Stokes (URaNS) equations with the realizable k-ε turbulence model and the Rohsenow boiling model for phase change calculation are solved by commercial software of STAR-CCM+. First, for the validation of the phase change model, the cryogenic liquid stored in an independent tank of type C is calculated to study thermal fluid behaviors inside the tank and the corresponding values of BOG and BOR are compared with the experiments as well as the results from numerical simulations by other researchers. The estimated BOR value showed an excellent agreement with discrepancy less than 1%, resolving precisely the thermal convection caused by the vaporization of the cryogenic liquid. Subsequently, the multiphase-thermal flow in a membrane-type LNG (liquefied natural gas) storage tank was calculated for the BOR estimation, coupled with thermal conduction through the insulation system. It is concluded from those simulations that the high-fidelity CFD calculation with the phase change model was able to precisely predict the vaporization of the cryogenic liquid and to calculate the correct BOR values based on the actual BOG amount.
Gyu-Mok Jeon; Jong-Chun Park; Seongim Choi. Multiphase-thermal simulation on BOG/BOR estimation due to phase change in cryogenic liquid storage tanks. Applied Thermal Engineering 2020, 184, 116264 .
AMA StyleGyu-Mok Jeon, Jong-Chun Park, Seongim Choi. Multiphase-thermal simulation on BOG/BOR estimation due to phase change in cryogenic liquid storage tanks. Applied Thermal Engineering. 2020; 184 ():116264.
Chicago/Turabian StyleGyu-Mok Jeon; Jong-Chun Park; Seongim Choi. 2020. "Multiphase-thermal simulation on BOG/BOR estimation due to phase change in cryogenic liquid storage tanks." Applied Thermal Engineering 184, no. : 116264.
Prediction of sloshing loads, which is one of the most important issues in the design of LNG carriers, has usually been carried out by experiments. When designing a 6-DOF platform equipment used for sloshing experiments, it should target a system containing a fluid, not a solid, thereby making it difficult to predict precisely the dynamic load due to the changes of a center of mass according to the tank’s movement. In the present study, two-way co-simulation technology between DualSPHysics and RecurDyn has been developed to analyze the mechanical behavior in multi-body system coupled with fluid motion; in which DualSPHysics is an open-source code based on particle method for fluid analysis and RecurDyn a commercial software for multi-flexible-body dynamics (MFBD). The developed technology was applied to the sloshing problem inside a tank connected to an upper plate on a 6-DOF platform. The simulation results were verified through comparison with the experiments conducted for this study independently, such as snapshots of flow motion, pressure on the cargo hold, and force applied to the tank-platform connection. Finally, to investigate the effects of fluid dynamic load on structural safety assessment, a two-way co-simulation between fluid-MFBD analysis was performed for two cases filling partially with fluid and solid. As a result, it was concluded that the sloshing experiment system used in this study was quite safe, and the feasibility of using the present co-simulation technology for structural safety assessment was confirmed.
Sang-Moon Yun; Sung-Pill Kim; Soh-Myung Chung; Woo-Jin Shin; Dae-Seung Cho; Jong-Chun Park. Structural Safety Assessment of Connection between Sloshing Tank and 6-DOF Platform Using Co-Simulation of Fluid and Multi-Flexible-Body Dynamics. Water 2020, 12, 2108 .
AMA StyleSang-Moon Yun, Sung-Pill Kim, Soh-Myung Chung, Woo-Jin Shin, Dae-Seung Cho, Jong-Chun Park. Structural Safety Assessment of Connection between Sloshing Tank and 6-DOF Platform Using Co-Simulation of Fluid and Multi-Flexible-Body Dynamics. Water. 2020; 12 (8):2108.
Chicago/Turabian StyleSang-Moon Yun; Sung-Pill Kim; Soh-Myung Chung; Woo-Jin Shin; Dae-Seung Cho; Jong-Chun Park. 2020. "Structural Safety Assessment of Connection between Sloshing Tank and 6-DOF Platform Using Co-Simulation of Fluid and Multi-Flexible-Body Dynamics." Water 12, no. 8: 2108.
In the present study, a 2-ton class seaweed harvesting boat was optimized by employing a W-shape hull form to reduce roll motion due to wake-wash from passing boats. A series of numerical simulations were conducted using Star-CCM+, a commercial CFD (computational fluid dynamics) software, to improve workability by optimizing the hull form from the conventional design (original hull form). The 2-dimensional roll decay motion of various hull forms with W-shape midsection were simulated and the hull form with the best performance in free roll decay test was selected. To evaluate stability of each hull in wake-wash, the original or optimized hull was alternately located at the middle of a computational domain as a target ship while an advancing ship (original hull) moved forward generating Kelvin waves which impact the original or optimized boat. Two kinds of working conditions, i.e., ballast and full loading conditions, of the target ship were considered with and without initial roll angle. It was observed through the comparison of motion between the original and optimized hulls a decrement of roll motion for the optimized ship demonstrating the effectiveness of the W-shape hull. Decrement of roll motion was observed for both working conditions. Additionally, the optimized W-shape hull showed an extraordinary performance under the ballast condition without initial roll angle.
Marco Polo Espinoza Haro; Jong-Chun Park; Dong-Hyun Kim; Sung-Bum Lee. CFD Simulation on Workability of a Seaweed Harvesting Boat Due to Wake-Wash. Journal of Marine Science and Engineering 2020, 8, 544 .
AMA StyleMarco Polo Espinoza Haro, Jong-Chun Park, Dong-Hyun Kim, Sung-Bum Lee. CFD Simulation on Workability of a Seaweed Harvesting Boat Due to Wake-Wash. Journal of Marine Science and Engineering. 2020; 8 (8):544.
Chicago/Turabian StyleMarco Polo Espinoza Haro; Jong-Chun Park; Dong-Hyun Kim; Sung-Bum Lee. 2020. "CFD Simulation on Workability of a Seaweed Harvesting Boat Due to Wake-Wash." Journal of Marine Science and Engineering 8, no. 8: 544.
This study investigated the resistance performance of ships, using the air resistance correction method. In general, air resistance is calculated using an empirical formula rather than a direct calculation, as the effect of air resistance on the total resistance of ships is relatively smaller than that of water. However, for ships with large superstructures, such as container ships, LNG (liquefied natural gas) carriers, and car-ferries, the wind-induced effects might influence the air resistance acting on the superstructure, as well as cause attitude (trim and sinkage) changes of the ship. Therefore, this study performed numerical simulations to compare the total resistance, trim, and sinkage of an 8000 TEU-class container, ship with and without superstructures. The numerical simulation conditions were verified by comparing them with the study results of the KCS (KRISO Container Ship) hull form. In addition, the differences in the above values between the two cases were compared using the coefficients calculated by the empirical formula to identify the effects on the air resistance coefficient.
Jun Seok; Jong-Chun Park. Comparative Study of Air Resistance with and without a Superstructure on a Container Ship Using Numerical Simulation. Journal of Marine Science and Engineering 2020, 8, 267 .
AMA StyleJun Seok, Jong-Chun Park. Comparative Study of Air Resistance with and without a Superstructure on a Container Ship Using Numerical Simulation. Journal of Marine Science and Engineering. 2020; 8 (4):267.
Chicago/Turabian StyleJun Seok; Jong-Chun Park. 2020. "Comparative Study of Air Resistance with and without a Superstructure on a Container Ship Using Numerical Simulation." Journal of Marine Science and Engineering 8, no. 4: 267.
In recent years, oil prices have continued to be low owing to the development of unconventional resources such as shale gas, coalbed methane gas, and tight gas. However, shipping companies are still experiencing difficulties because of recession in the shipping market. Hence, they devote considerable effort toward reducing operating costs. One of the important parameters for reducing operating costs is the frictional resistance of vessels. Generally, a vessel is covered with paint for smoothing its surface. However, frictional resistance increases with time owing to surface roughness, such as that caused by fouling. To prevent this, shipping companies periodically clean or repaint the surfaces of vessels using analyzed operating data. In addition, studies using various methods have been continuously carried out to identify this phenomenon such as fouling for managing ships more efficiently. In this study, numerical simulation was used to analyze the change in the resistance performance of a ship owing to an increase in surface roughness using commercial software, i.e., Star-CCM+, which solves the continuity and Navier–Stokes equations for incompressible and viscous flow. The conditions for numerical simulation were verified through comparison with experiments, and these conditions were applied to three ships to evaluate resistance performance according to surface roughness.
Jun Seok; Jong-Chun Park. Numerical simulation of resistance performance according to surface roughness in container ships. International Journal of Naval Architecture and Ocean Engineering 2019, 12, 11 -19.
AMA StyleJun Seok, Jong-Chun Park. Numerical simulation of resistance performance according to surface roughness in container ships. International Journal of Naval Architecture and Ocean Engineering. 2019; 12 ():11-19.
Chicago/Turabian StyleJun Seok; Jong-Chun Park. 2019. "Numerical simulation of resistance performance according to surface roughness in container ships." International Journal of Naval Architecture and Ocean Engineering 12, no. : 11-19.
The present paper covers the numerical prediction of the propagation and run-up of a solitary wave over non-flat seabed with various slope angles using a refined MPS (moving particle simulation) method. In the refined method, the corrected gradient model, new staggered divergence-free model, moving-particle wall boundary treatment, and the sub-particle scale turbulence model are applied to obtain more stable and precise results. The simulation results by the developed method are compared with experimental results, and both results were in good agreement. Especially, it can be seen that the complicated and fully-nonlinear behavior of the free-surface motion during the turbulent processes of build-up, break-down, and overturning of the waves are well reproduced by the developed method.
Se-Min Jeong; Ji-In Park; Jong-Chun Park. Numerical Simulation of 2-D Solitary Wave Run-Up over Various Slopes Using a Particle-Based Method. Water 2019, 11, 462 .
AMA StyleSe-Min Jeong, Ji-In Park, Jong-Chun Park. Numerical Simulation of 2-D Solitary Wave Run-Up over Various Slopes Using a Particle-Based Method. Water. 2019; 11 (3):462.
Chicago/Turabian StyleSe-Min Jeong; Ji-In Park; Jong-Chun Park. 2019. "Numerical Simulation of 2-D Solitary Wave Run-Up over Various Slopes Using a Particle-Based Method." Water 11, no. 3: 462.
Gyu-Mok Jeon; Jong-Chun Park. CFD Simulation of Air-particle Flow for Predicting the Collection Efficiency of a Cyclone Separator in Mud Handling System. Journal of Ocean Engineering and Technology 2019, 33, 42 -49.
AMA StyleGyu-Mok Jeon, Jong-Chun Park. CFD Simulation of Air-particle Flow for Predicting the Collection Efficiency of a Cyclone Separator in Mud Handling System. Journal of Ocean Engineering and Technology. 2019; 33 (1):42-49.
Chicago/Turabian StyleGyu-Mok Jeon; Jong-Chun Park. 2019. "CFD Simulation of Air-particle Flow for Predicting the Collection Efficiency of a Cyclone Separator in Mud Handling System." Journal of Ocean Engineering and Technology 33, no. 1: 42-49.
A realistic numerical simulation technology using a Lagrangian Fluid-Structure Interaction (FSI) model was combined with a fracture algorithm to predict the fluid-ice-structure interaction. The failure of ice was modeled as the tensile fracture of elastic material by applying a novel FSI model based on the Moving Particle Semi-implicit (MPS) method. To verify the developed fracture algorithm, a series of numerical simulations for 3-point bending tests with an ice beam were performed and compared with the experiments carried out in an ice room. For application of the developed FSI model, a dropping water droplet hitting a cantilever ice beam was simulated with and without the fracture algorithm. The simulation showed that the effects of fracture which can occur in the process of a FSI simulation can be studied.
Di Ren; Jong-Chun Park; Sung-Chul Hwang; Seong-Yeob Jeong; Hyun-Soo Kim. Failure simulation of ice beam using a fully Lagrangian particle method. International Journal of Naval Architecture and Ocean Engineering 2019, 11, 639 -647.
AMA StyleDi Ren, Jong-Chun Park, Sung-Chul Hwang, Seong-Yeob Jeong, Hyun-Soo Kim. Failure simulation of ice beam using a fully Lagrangian particle method. International Journal of Naval Architecture and Ocean Engineering. 2019; 11 (2):639-647.
Chicago/Turabian StyleDi Ren; Jong-Chun Park; Sung-Chul Hwang; Seong-Yeob Jeong; Hyun-Soo Kim. 2019. "Failure simulation of ice beam using a fully Lagrangian particle method." International Journal of Naval Architecture and Ocean Engineering 11, no. 2: 639-647.
The speed trial of a ship is one of the important elements guaranteeing its performance under the contract between the ship owner and shipbuilding company. A speed trial at sea, where the tidal current and waves are suppressed to the maximum, can prevent measurement errors due to external force conditions. On the other hand, it is difficult to maintain a calm sea state in most sea areas determined by the influence of the tidal current, wave, wind, etc. Therefore, this study evaluated a method of simulating a tidal current, which is one of the external force conditions, at the speed test operation of a ship, and applied the simulation result to the plan of a speed trial.
Hee-Su Lee; Byung-Hyuk Lee; Kyung Sung Kim; Sung Yong Kim; Jong-Chun Park. Tidal current simulation around the Straits of Korea and its application to a speed trial. International Journal of Naval Architecture and Ocean Engineering 2018, 11, 474 -481.
AMA StyleHee-Su Lee, Byung-Hyuk Lee, Kyung Sung Kim, Sung Yong Kim, Jong-Chun Park. Tidal current simulation around the Straits of Korea and its application to a speed trial. International Journal of Naval Architecture and Ocean Engineering. 2018; 11 (1):474-481.
Chicago/Turabian StyleHee-Su Lee; Byung-Hyuk Lee; Kyung Sung Kim; Sung Yong Kim; Jong-Chun Park. 2018. "Tidal current simulation around the Straits of Korea and its application to a speed trial." International Journal of Naval Architecture and Ocean Engineering 11, no. 1: 474-481.
The liquid sloshing phenomenon which damages the structures of various systems and affects their global motion of the system is one of the most important problems in naval architecture and ocean engineering. Thus far, several efforts have been attempted to reduce the fluid impact load induced by sloshing, such as the installation of additional equipment like baffles to avoid the resonance period with the tank or to restrain violent sloshing flow. In this paper, a concept of “moving baffles” is introduced, which is containing a spring system as one of the attempts for reducing sloshing impact. To observe the sloshing reduction effect of the moving baffles, a series of sloshing experiments considering the sway motion of a rectangular tank was conducted, and the experimental results for the case without any additional equipment were compared to those for the case with the baffles linked to two types of spring systems with different stiffness. The image, pressure, and force data were obtained through the sloshing experiments, and the effectiveness of the spring baffles was examined by comparing the statistical analysis results of the extremal probability and exceedance probability distribution.
Sung-Pill Kim; Soh-Myung Chung; Woo-Jin Shin; Dae-Seung Cho; Jong-Chun Park. Experimental study on sloshing reduction effects of baffles linked to a spring system. Ocean Engineering 2018, 170, 136 -147.
AMA StyleSung-Pill Kim, Soh-Myung Chung, Woo-Jin Shin, Dae-Seung Cho, Jong-Chun Park. Experimental study on sloshing reduction effects of baffles linked to a spring system. Ocean Engineering. 2018; 170 ():136-147.
Chicago/Turabian StyleSung-Pill Kim; Soh-Myung Chung; Woo-Jin Shin; Dae-Seung Cho; Jong-Chun Park. 2018. "Experimental study on sloshing reduction effects of baffles linked to a spring system." Ocean Engineering 170, no. : 136-147.
The marine hydropower system proposed in this study creates a tidal jet generator from a seawater exchange type breakwater, with empty space similar to a basin to store ocean water. Due to the water level difference between the inner and outer sides of the breakwater, strong and uni-directional jets are generated. The energy from the jets is captured by turbines in the breakwater ducts. In this study, the proposed system is first introduced. The design process for a new turbine and its preliminary performance in openwater conditions, estimated using Computational fluid dynamics (CFD), are presented. Experiments with the turbine in a Circulating water channel (CWC) at Pusan National University were also carried out. The results from the simulations and experiments with the same conditions were compared to verify the CFD accuracy. The turbine performance in a duct is estimated; the target power can be generated using the newly developed turbine.
Se-Min Jeong; Seong-Oh Kim; Hee-Su Lee; Jong-Chun Park. Simulation of hydropower turbine performance in duct for system utilizing tidal jet generator. Journal of Mechanical Science and Technology 2017, 31, 5871 -5877.
AMA StyleSe-Min Jeong, Seong-Oh Kim, Hee-Su Lee, Jong-Chun Park. Simulation of hydropower turbine performance in duct for system utilizing tidal jet generator. Journal of Mechanical Science and Technology. 2017; 31 (12):5871-5877.
Chicago/Turabian StyleSe-Min Jeong; Seong-Oh Kim; Hee-Su Lee; Jong-Chun Park. 2017. "Simulation of hydropower turbine performance in duct for system utilizing tidal jet generator." Journal of Mechanical Science and Technology 31, no. 12: 5871-5877.
해양 유정의 시추를 위한 드릴링이 진행되는 동안 원활한 드릴링 작업을 진행하기 위하여 드릴링 시스템을 순환하는 머드에 벌크가 Shear mixer을 통하여 첨가된다. 이러한 벌크 투입으로 조절된 머드의 물성치는 드릴링시스템 전반의 안정성에 영향을 주며, 머드와의 혼합이 이루어지는 Shear mixer의 성능개선은 전체 드릴링 시스템의 성능향상과 관계된다고 할 수 있다. 이에 본 연구에서는 Shear mixer내 혼상유동의 특징을 알아보기 위해 파이프형상의 관내 고체-액체 혼상유동 실험에서 측정된 고체 침전도결과(Gilles et al., 2004)를 시뮬레이션 결과와 비교검증을 수행한 후, 이를 통해 얻어진 관내 액체-고체 혼상유동 시뮬레이션 조건을 바탕으로 Shear mixer의 혼합효율을 개선시킬 수 있는 최적형상에 관한 시뮬레이션 기반 설계를 수행하였다.
Tae-Young Kim; Gyu-Mok Jeon; Dae-Kyung Ock; Jong-Chun Park. Simulation-Based Design of Shear Mixer for Improving Mixing Performance. Journal of the Korean Society for Marine Environment & Energy 2017, 20, 107 -116.
AMA StyleTae-Young Kim, Gyu-Mok Jeon, Dae-Kyung Ock, Jong-Chun Park. Simulation-Based Design of Shear Mixer for Improving Mixing Performance. Journal of the Korean Society for Marine Environment & Energy. 2017; 20 (2):107-116.
Chicago/Turabian StyleTae-Young Kim; Gyu-Mok Jeon; Dae-Kyung Ock; Jong-Chun Park. 2017. "Simulation-Based Design of Shear Mixer for Improving Mixing Performance." Journal of the Korean Society for Marine Environment & Energy 20, no. 2: 107-116.
하나의 시스템 내에 2개 이상의 상이 다른 유체가 존재할 시에는 다상유동에 의한 복장성이 존재하며, 이는 해석의 어려움이 따른다. 두 개 이상의 상이 다른 다상유동은 유동 및 경계면에 영향을 끼치지 때문에, 불안정성과 같은 비선형 유동이 나타나게 된다. 여러 종류의 불안정성 중 레일리히-테일러 불안정성은 대표적인 예로 알려져 있다. 본 연구에서는 밀도차가 레일리히-테일러 불안정성에 미치는 영향을 조사하기 위해 다양한 Atwood 수를 선정하였으며, 초기 경계면 형상 역시 다양한 형태를 설정하고 시뮬레이션 하였다. 본 연구에서 사용된 입자법인 MPS(Moving particle simulation)은 이러한 다상유동에서 널리 쓰이지는 않았으나, 다상유동을 위한 입자간 상호 연성 모델인 자가-부력 항, 표면 장력 항과 경계면 경계 조건 항을 추가로 사용하여 수치해석이 가능하게 하였다. 본 연구에서 새로이 개발된 다상유동형 입자법을 이용하여 고려된 경우들에 대해 수치해석을 수행하였으며, 각각의 결과들을 비교 분석하였다. 또한 레일리히-테일러 불안정성에 기인한 유동의 속도를 측정하여 포텐셜 기반의 이론값과의 비교를 통해 경향성이 일치함을 알 수 있었다. 이론값과의 크기의 차는 포텐셜 기반의 이론값에서는 고려가 힘든 비선형성에 기인한다고 사료된다.
Kyung Sung Kim; Bonguk Koo; Moo-Hyun Kim; Jong-Chun Park; Han-Suk Choi; Yong-Jin Cho. Numerical Study on Rayleigh-Taylor Instability Using a Multiphase Moving Particle Simulation Method. Journal of the Korean Society for Marine Environment & Energy 2017, 20, 37 -44.
AMA StyleKyung Sung Kim, Bonguk Koo, Moo-Hyun Kim, Jong-Chun Park, Han-Suk Choi, Yong-Jin Cho. Numerical Study on Rayleigh-Taylor Instability Using a Multiphase Moving Particle Simulation Method. Journal of the Korean Society for Marine Environment & Energy. 2017; 20 (1):37-44.
Chicago/Turabian StyleKyung Sung Kim; Bonguk Koo; Moo-Hyun Kim; Jong-Chun Park; Han-Suk Choi; Yong-Jin Cho. 2017. "Numerical Study on Rayleigh-Taylor Instability Using a Multiphase Moving Particle Simulation Method." Journal of the Korean Society for Marine Environment & Energy 20, no. 1: 37-44.
Sung-Chul Hwang; Jong-Chun Park; Hitoshi Gotoh; Abbas Khayyer; Kuk-Jin Kang. Numerical simulations of sloshing flows with elastic baffles by using a particle-based fluid–structure interaction analysis method. Ocean Engineering 2016, 118, 227 -241.
AMA StyleSung-Chul Hwang, Jong-Chun Park, Hitoshi Gotoh, Abbas Khayyer, Kuk-Jin Kang. Numerical simulations of sloshing flows with elastic baffles by using a particle-based fluid–structure interaction analysis method. Ocean Engineering. 2016; 118 ():227-241.
Chicago/Turabian StyleSung-Chul Hwang; Jong-Chun Park; Hitoshi Gotoh; Abbas Khayyer; Kuk-Jin Kang. 2016. "Numerical simulations of sloshing flows with elastic baffles by using a particle-based fluid–structure interaction analysis method." Ocean Engineering 118, no. : 227-241.
For oil/gas production/processing platforms, multiple liquid layers can exist and their respective sloshing motions can also affect operational effectiveness or platform performance. To numerically simulate those problems, a new multiliquid moving particle simulation (MPS) method is developed. In particular, to better simulate the relevant physics, robust self-buoyancy model, interface searching model, and surface-tension model are developed. The developed multiliquid MPS method is validated by comparisons against experiment in which three-liquid-sloshing experiment and the corresponding linear potential theory are given. The validated multiliquid MPS program is subsequently coupled with a vessel-motion program in time domain to investigate their dynamic-coupling effects. In case of multiple liquid layers, there exists a variety of sloshing natural frequencies for respective interfaces, so the relevant physics can be much more complicated compared with the single-liquid-tank case. The simulation program can also reproduce the detailed small-scale interface phenomenon called Kelvin–Helmholtz instability. The numerical simulations also show that properly designed liquid cargo tank can also function as a beneficial antirolling device.
Kyung Sung Kim; Moo-Hyun Kim; Jong-Chun Park. Simulation of Multiliquid-Layer Sloshing With Vessel Motion by Using Moving Particle Semi-Implicit Method. Journal of Offshore Mechanics and Arctic Engineering 2015, 137, 051602 .
AMA StyleKyung Sung Kim, Moo-Hyun Kim, Jong-Chun Park. Simulation of Multiliquid-Layer Sloshing With Vessel Motion by Using Moving Particle Semi-Implicit Method. Journal of Offshore Mechanics and Arctic Engineering. 2015; 137 (5):051602.
Chicago/Turabian StyleKyung Sung Kim; Moo-Hyun Kim; Jong-Chun Park. 2015. "Simulation of Multiliquid-Layer Sloshing With Vessel Motion by Using Moving Particle Semi-Implicit Method." Journal of Offshore Mechanics and Arctic Engineering 137, no. 5: 051602.
Abbas Khayyer; Hitoshi Gotoh; Jong-Chun Park; Sung-Chul Hwang; Takazumi Koga. An Enhanced Fully Lagrangian Coupled MPS-based Solver for Fluid-Structure Interactions. Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 2015, 71, I_883 -I_888.
AMA StyleAbbas Khayyer, Hitoshi Gotoh, Jong-Chun Park, Sung-Chul Hwang, Takazumi Koga. An Enhanced Fully Lagrangian Coupled MPS-based Solver for Fluid-Structure Interactions. Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering). 2015; 71 (2):I_883-I_888.
Chicago/Turabian StyleAbbas Khayyer; Hitoshi Gotoh; Jong-Chun Park; Sung-Chul Hwang; Takazumi Koga. 2015. "An Enhanced Fully Lagrangian Coupled MPS-based Solver for Fluid-Structure Interactions." Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71, no. 2: I_883-I_888.