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OpenFOAM 라이브러리를 이용한 선박 저항계산 프로그램 개발
박선호(Sunho Park),박세완(Se Wan Park),이신형(Shin Hyung Rhee),이상봉(Sang Bong Lee),최정은(Jung-Eun Choi),강선형(Seon Hyung Kang) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
An Reynolds-averaged Navier-Stokes equations solver based on a pressure-based cell-centered finite volume method was developed using OpenFOAM libraries. For the reasonable development of the turbulent boundary layer on the bow of the ship, the wall function was implemented as a numerically different form. Grid sensitivities, such as skewness and aspect ratio of a cell, were tested for the solution convergence. Pressure, turbulent kinetic energy, turbulent dissipation rate contours on the ship surface computed by the developed solver were compared with those computed by the commercial CFD code, Fluent.
자유수면 유동 해석에서 해의 번짐 방지를 위한 소스항의 영향 연구
박선호(Sunho Park),박세완(Se Wan Park),이신형(Shin Hyung Rhee) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Accurate simulation of free-surface wave flow s around a ship is very important for better hull-form design. In this paper, a computational fluid dynamics (CFD) code, termed SNUFOAM, which is based on the open source libraries, OpenFOAM, was developed to predict the wave patterns around a ship. Additional anti-diffusion source term for minimizing a numerical diffusion, which was caused by convection differencing scheme and temporal discretization, was considered in the volume-fraction transport equation. The influence of the anti-diffusion source term was tested by applying it to free-surface wave flow around the Wigley and KCS. For the Wigley case, the band width of the volume fraction contours between 0.1 to 0.9 at the hull surface was narrowed by considering the anti-diffusion term. In the KCS case, a non-physical wave profile at the hull surface was generated by considering the anti-diffusion term due to the highly skewed meshes around the stern of the KCS.
소스공개 라이브러리를 활용한 선박 저항계산 CFD 코드 개발
박선호(Sunho Park),박세완(Se Wan Park),이신형(Shin Hyung Rhee),이상봉(Sang Bong Lee),최정은(Jung-Eun Choi),강선형(Seon Hyung Kang) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
Reynolds-averaged Navier-Stokes equations solver based on a pressure-based cell-centered finite volume method was developed using OpenFOAM libraries, which was an open source and providing computational continuum mechanics libraries. For the reasonable development of the turbulent boundary layer on the bow of the ship, specified library was developed. Grid sensitivities, such as skewness and aspect ratio of a cell, were tested for the solution convergence. Pressure, turbulent kinetic energy, turbulent dissipation rate contours on the ship surface computed by the developed CFD code were compared with those computed by the commercial CFD code, Fluent.
난류강도에 따른 FAST 기반 풍력발전장치 연간발전량의 영향 연구
노찬(Roh Chan),안현정(Hyen-Jeong Ahn),하윤진(Yoon-Jin Ha),박세완(Se-Wan Park),김경환(Kyong-Hwan Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.5
본 연구에서는 풍황자원의 난류 강도에 따른 부유식 풍력발전장치의 연간발전량의 영향에 대해서 분석하였다. 풍력발전장치는 난류강도에 따라서 동일한 평균 풍속에서도 출력 특성이 변화할 수 있기 때문에 난류강도에 따른 출력특성 분석이 필요하다. 특히 부유식 풍력발전장치는 난류강도에 따라서 피치제어기의 성능이 변화하고 이에 따라 출력 특성이 변화하기 때문에 기존의 육상 풍력발전장치보다 난류강도는 출력특성에 더 큰 영향을 준다. 난류강도는 IEC turbulence characteristic에 따라서 A, B, C 세가지로 분류하였고, 이에 따른 발전성능의 차이에 대해서 분석을 진행하였다. 본 연구에서는 NREL의 FAST를 이용해서 부유식 풍력발전장치의 연간발전량을 분석하였고, 대상 모델은 NREL의 5MW급 터빈과 Semi-OC4 플랫폼을 적용하였다. In this study, the effect of annual power generation of a floating wind power generator according to the turbulence intensity of wind turbine resources was analyzed. Wind power generators need to analyze the output characteristics according to the turbulence intensity because the output characteristics can be changed even at the same average wind speed according to the turbulence intensity. In particular, since the performance of the pitch controller changes according to the turbulence intensity of the floating wind turbine and the output characteristics change accordingly, the turbulence intensity has a greater influence on the output characteristics than the conventional onshore wind turbine generator. Turbulence intensity was classified into A, B, and C according to IEC turbulence characteristics, and the difference in power generation performance was analyzed accordingly. In this study, the annual generation of floating wind turbines was analyzed using NREL's FAST, and the target model was NREL's 5MW class turbine and Semi-OC4 platform.