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수평축 조류발전 터빈의 비 설계 조건을 고려한 수치 해석 기법 개발
박세완(S.W. Park),박선호(S. Park),이신형(S.H. Rhee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
To design a better tidal stream turbine being operated in off-design condition, analyses considering the effect of blade deformation and non-conventional inflow condition are essential. Flow load causes deformation on the blade, and the deformation affects the turbine performance. Also, non-conventional inflow conditions, such as inclined inflow and vertically sheared inflow could influence the turbine performance. In the present study, CFD analysis procedures were developed to predict performance of horizontal axis tidal stream turbine (HATST). The developed procedures were verified by comparing the results with existing experimental results. Fluid-structure interaction (FSI) analysis method, based on the verified CFD procedure, carried out to estimate the turbine performance for a turbine with flexible composite blades, and then the results were compared with that for rigid blades. Moreover, the effects on turbine performance with non-conventional inflow conditions were investigated with the extended numerical method.
고선호(S.H. Ko),최학규(H.K. Choi),이희범(H.B. Lee),이신형(S.H. Rhee) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.3
A fishway is a structure on or around artificial and natural barriers, such as dams, locks and waterfalls, to help fishes natural migration. In this paper, a computational fluid dynamics (CFD) code, termed SNUFOAM is used to analyze vertical hydraulic characteristic of rollway of fishway. Volume-of-fluid (VOF) method was used to handle free-surface. It is important to determine the factors influencing flow characteristics in fishway because fish use directional information from the flow characteristics to navigate through fishway. Fishway was modeled in 2-D and the influence of the stream velocity, slope, and weir height of fishway was tested. In results, the transition Reynolds number was 2×10<SUP>5</SUP> ~ 3×10<SUP>5</SUP>.
반구형 전두부 실린더에서 발생하는 캐비테이션 유동의 압축성 효과에 대한 수치해석 연구
박선호(S. Park),이신형(S.H. Rhee),신병록(B.R. Shin) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.4
Cavitation on an axi-symmetric hemispherical head-form body was studied using an Reynolds-averaged Navier-Stokes equations solver based on a cell-centered finite volume method. To consider compressibility effects on the vapor phase and cavity interface, a pressure-based compressible flow CFD code was developed. To validate the developed CFD code, cavitating flow around the hemispherical head-form body was simulated using pressure-based incompressible and compressible CFD codes and validated against existing experimental data in the three-way comparison. The cavity shedding behavior, length of re-entrant jet, drag history, and Strouhal number of the hemispherical head-form body were compared between two CFD codes. The results, in this paper, suggested that the computations of cavitating flow with compressibility effects improve the description of cavity dynamics.