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On the Reverse of Streamwise Velocity Deficit in Formation of Boundary-layer Streaks
Suh, Sung-Bu,Boiko, Andrey V.,Chun, H. H. The Korean Association of Ocean Science and Techno 2005 Journal of Ocean Science and Technology Vol.2 No.1
The phenomenon of transformation of streamwise velocity deficit to excess in a near-wall wake behind a flat-plate roughness observed previously in numerous experiments is analyzed qualitatively by means of theories of optimal disturbances based on linearized Navier-Stokes and linearized boundary layer equations. It is shown that the reverse of the velocity deficit can accompany the excitation of a streak and that the formation of two maxima in the disturbance stream wise velocity profiles also observed in the experiments can be a side effect of the streak nonoptimality. An experimental approach aimed to provide quantitative data for comparison with a numerical solution of corresponding initial value problem is suggested.
The Response of Three-dimensional Boundary Layer over a Swept-wing to a Free Stream Axial Vortex
Suh, Sung-Bu,Boiko, Andrey V.,Lee, Inwon,Chun, H. H. The Korean Association of Ocean Science and Techno 2005 Journal of Ocean Science and Technology Vol.2 No.1
A response of a swept wing boundary layer to a single free-stream stationary axial vortex of a limited spanwise extent is investigated. The response is dominated by streamwise velocity perturbations that grew quasi-exponentially downstream. It is shown that the formation of the boundary layer disturbance occurs for the most part close to the leading edge. The disturbance represents itself a wave packet consisted of the waves with characteristics specific for cross-flow instability. However, an admixture of growing disturbances which origin can be attributed to transient effects and distributed receptivity mechanism is also identified.
Flow Pattern around Floating Breakwater Using PIV Technique
Sung-Bu Suh,Kwang Hyo Jung 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.3
The purpose of this study is the investigation of the wave interaction with the rectangular floating breakwater. The flow profile obtained by PIV technique is represented to understand the vortical flow due to the wave interaction with a rectangular floating breakwater in the roll motion and the fixed condition. Also, the transmission coefficients are compared in both conditions over the extensive wave periods, which represent the performance of breakwater to attenuate the incoming waves. These results would be applied to design the floating breakwater having the mooring system to improve its performance for a certain wave period.
Numerical And Experimental Studies On Wing In Ground Effect
Suh, Sung-Bu,Jung, Kwang-Hyo,Chun, Ho-Hwan Korean Society of Ocean Engineers 2011 International journal of ocean system engineering Vol.1 No.2
Numerical and experimental studies were performed to investigate the aerodynamic performance of a thin wing in close vicinity to the ground. The vortex lattice method (VLM) was utilized to simulate the wing in ground (WIG) effect, which included freely deforming wake elements. The numerical results acquired through the VLM were compared to the experimental results. The experiment entailed varying the ground clearance using the DHMTU (Department of Hydromechanics of the Marine Technical University of Saint Petersburg) wing and the WIG craft model in the wind tunnel. The aero-dynamic influence of the design parameters, such as angles of attack, aspect ratios, taper ratios, and sweep angles were studied and compared between the numerical and experimental results associated with the WIG craft. Both numerical and experimental results suggested that the endplate augments the WIG effect for a small ground clearance. In addition, the vortex lattice method simulated the wake deformation following the wing in the influence of the ground effect.
Kim, Bu-Yeo,Suh, Kyung-Suk,Lee, Je-Geun,Woo, Seon Rang,Park, In-Chul,Park, Sun-Hoo,Han, Chul Ju,Kim, Sang-Bum,Jeong, Sook-Hyang,Yeom, Young Il,Yang, Suk-Jin,Kim, Chang-Min,Cho, Su Jin,Yoo, Young Do,Ch Raven Press 2012 Annals of Surgical Oncology Vol.19 No.suppl3
<P>The tissue environment in the region of hepatocellular carcinoma (HCC) influences both vascular invasion and recurrence. Thus, HCC patient prognosis depends on the characteristics not only of the tumor but also those of adjacent surrounding liver tissue.</P>
서성부(Sung-Bu Suh) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.4
Current trends in propeller design have led to the need for extremely complex blade shapes, Which place great demands on the accuracy of design and analysis methods. This paper presents a new proposal for improving the prediction of propeller performance with a vortex lattice method using the lifting surface theory. The paper presents a review of the theory and a description of the numerical methods employed. For 8 different propellers, the open water characteristics are calculated and compared with experimental data. The results are in good agreement in the region of a high advanced velocity, but there are differences in the other case. We have corrected the parameters for the trailing wake modeling in this paper, and repeated the calculation. The new calculation results are more in agreement with the experimental data.
포텐셜 기저 패널법에 의한 프로펠러 보호터널의 형상변화에 관한 연구
서성부,Suh, Sung-Bu 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.5
The fishing boat propulsion system employing the modified stern shape and the tunnel to protect a propeller is developed to increase the cruise speed and reduce he problem resulting from the open propeller accidentally catching the waste net and able on the sea. Using 3 different tunnel types, the model test was performed in the circular water channel and the panel method based on the potential theory is applied to analyze the open water performance of the propeller. In the numerical analysis using he potential-based panel method, it calculates the hydrodynamic interaction between the propeller and the tunnel and evaluates the effect of the tunnel geometry. From the numerical and experimental results differing tunnel geometries, the propulsion efficiency is increased by the larger diameter of the inlet than the outlet of the tunnel and the smaller gap between the propeller tip and the tunnel internal surface. These results provide the information of the propeller system with the tunnel and the hydrodynamic interaction between the propeller and the tunnel.
서성부(Sung-Bu Suh) 한국항해항만학회 2011 한국항해항만학회지 Vol.35 No.6
본 연구는 선박 추진시스템 설계를 위한 제품정보관리(Product Data Management, PDM) 시스템의 구현 사례를 소개하였다. 객체 지향 모델링 언어(Unified Modeling Language, UML)를 이용하여 중소형 선박 추진성능 추정 시스템을 설계하였으며, 프로펠러의 3차원 디지털 모크업(Digital Mock-Up, DMU)을 중심으로 제품정보를 구축하였다. 또한 설계 과정에 필요한 모델링 및 시뮬레이션(Modeling & Simulation, M&S) 기술을 PDM 시스템과 통합하기 위한 방안을 제안하고, 추진기 및 축계 설계 검증 모델을 동시에 구현하였다. 시스템 개발에는 Open Scene Graph(OSG) 라이브러리 및 객체 지향 시스템 개발 도구를 사용하였다. 최종적으로는, 설계 검증용 M&S 소프트웨어와 PDM 시스템을 연동한 구현 사례를 보임으로써 추진성능 추진 시스템의 개발환경 구축 방안을 제시하였다. Present study introduces an implementation of product data management (PDM) that can be applied to the design of ship propulsion system. The PDM system is developed based on both object oriented software development environment and Open Scene Graph (OSG) library while the system architecture is modeled by the unified modeling language (UML). Suggested PDM system also integrates the modeling & simulation components required to estimate the performance of ship propulsion system as the product information is represented based on the 3-dimensional digital mock-up (DMU). Finally, functions of the implemented PDM system that is integrated with the M&S softwares are illustrated in order to suggest a practical guidance for the efficient design of ship propulsion system.
CFD를 이용한 KRISO 추진효율 향상 장치(K-duct)의 성능 해석
서성부(Sung-Bu Suh) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.3
This paper provides numerical results for the estimation of the efficiency of KRISO energy saving devices in the design stage. A finite volume method is used to solve Reynolds averaged Navier-Stokes (RANS) equations, where the SST k-ω model is selected for turbulence closure. The propeller rotating motion is determined using a rigid body motion (RBM) scheme, which is called a sliding mesh technique. The numerical analysis focuses on predicting the power reduction by the designed KRISO devices (K-DUCT) under a self-propulsion condition. The present numerical results show good agreement with the available experimental data. Finally, it is concluded that CFD can be a useful method, along with model tests, for assessing the performance of energy saving devices for propulsion efficiency improvement.