큰 상부 형상을 가지는 FLNG (Liquefied Natural Gas Floating Production Storage Offloading Units, LNG FPSOs) 등의 해양구조물은 안정적인 운동성능 확보 및 계류라인 설계에 있어 정도 높은 풍하중 추정이 필수...
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https://www.riss.kr/link?id=A108417832
이상의 (창원대학교)
2022
Korean
uniform wind speed ; NPD model ; wind speed profile ; wind loads ; liquefied FPSOs ; computational fluid dynamics ; 균일 풍속 ; NPD 모델 ; 풍속 프로파일 ; 풍하중 ; FLNG ; 전산유체역학
KCI등재
학술저널
491-500(10쪽)
0
상세조회0
다운로드국문 초록 (Abstract)
큰 상부 형상을 가지는 FLNG (Liquefied Natural Gas Floating Production Storage Offloading Units, LNG FPSOs) 등의 해양구조물은 안정적인 운동성능 확보 및 계류라인 설계에 있어 정도 높은 풍하중 추정이 필수...
큰 상부 형상을 가지는 FLNG (Liquefied Natural Gas Floating Production Storage Offloading Units, LNG FPSOs) 등의 해양구조물은 안정적인 운동성능 확보 및 계류라인 설계에 있어 정도 높은 풍하중 추정이 필수적이다. 따라서 본 연구의 목적은 FLNG의 풍하중 추정을 위한 수치해석 기법을 개발하는 데 있다. 특히, 본 연구에서 개발한 수치해석 기법은 저자의 이전연구를 FLNG에 맞추어 수정하였다. 풍하중 추정을 위한 수치해석은 15° 간격으로 0-360° 범위에서 균일 풍속 조건과 풍속 프로파일을 적용한 NPD (Norwegian Petroleum Directorate) 조건에서 수행하였다. 먼저, NPD 모델 풍속 프로파일 모델 개발을 위해 Sand-Grain Roughness 변화에 따른 풍속 프로파일을 분석하였다. 개발된 NPD 모델을 이용하여 3가지 풍향 (Head, Quartering & Beam)에 대한 메쉬 수렴성 시험을 수행하였다. 최종적으로 개발된 NPD 모델과 메쉬를 이용하여 균일한 풍속 조건과 NPD 조건에서의 풍하중을 평가하고 비교하였다. 본 연구에서는 RANS (Reynolds-averaged Navier-Stokes) 기반 Solver인 STAR-CCM+ (17.02)를 이용하였다. 결과를 요약하면, 풍속 프로파일을 적용한 NPD 모델에서의 풍하중은 균일 풍속() 조건과 비교하여, Surge와 Yaw 하중이 최대 20.35% 와 34.27% 증가하였다. 특히, 특정 일부 구간에서만 큰 하중의 차이를 보인 Sway (, )와 Roll (, )은 구간별 평균 증가율이 15.60%와 10.89% 수준으로 나타났다.
다국어 초록 (Multilingual Abstract)
It has been noted that an accurate estimation of wind loads on offshore structures such as an FLNG (Liquefied Natural Gas Floating Production Storage Offloading Units, LNG FPSOs) with a large topside plays an important role in the safety design of hul...
It has been noted that an accurate estimation of wind loads on offshore structures such as an FLNG (Liquefied Natural Gas Floating Production Storage Offloading Units, LNG FPSOs) with a large topside plays an important role in the safety design of hull and mooring system. Therefore, the present study aims to develop a computational model for estimating the wind load acting on an FLNG. In particular, it is the sequel to the previous research by the author. The numerical computation model in the present study was modified based on the previous research. Numerical analysis for estimating wind loads was performed in two conditions for an interval of wind direction (), 15° over the range of 0° to 360°. One condition is uniform wind speed and the other is the NPD model reflecting the wind speed profile. At first, the effect of sand-grain roughness on the speed profile of the NPD model was studied. Based on the developed NPD model, mesh convergence tests were carried out for 3 wind headings, i.e. head, quartering, and beam. Finally, wind loads on 6-degrees of freedom were numerically estimated and compared by two boundary conditions, uniform speed, and the NPD model. In the present study, a commercial RANS-based viscous solver, STAR-CCM+ (ver. 17.02) was adopted. In summary, wind loads in surge and yaw from the wind speed profile boundary condition were increased by 20.35% and 34.27% at most. Particularly, the interval mean of sway (, ) and roll (, ) increased by 15.60% and 10.89% against the uniform wind speed () boundary condition.
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9 Aage, C., "Wind Coefficients for Nine Ship Models" Hydro- and Aerodynamic Laboratory 1971
10 STAR-CCM+, "User’s Guide (Ver. 17.02)"
1 이상의, "풍속 분포곡선이 어선의 풍하중에 미치는 영향에 관한 연구" 해양환경안전학회 26 (26): 922-930, 2020
2 Shearer, K. D. A., "Wind Tunnel Tests on Models of Merchant Ships" 76 : 229-266, 1960
3 White, G. P., "Wind Resistance-suggested Procedure for Correction of Ship Trial Results, NPL TM116"
4 Isherwood, R. M., "Wind Resistance of Merchant Ships" 114 (114): 327-338, 1972
5 Blendermann, W., "Wind Loads on Moored and Manoeuvering Vessels" I : 183-189, 1993
6 Haddara, M. R., "Wind Loads on Marine Structures" 12 : 199-209, 1999
7 Blendermann, W., "Wind Loading of Ships-collected Data from Wind Tunnel Tests in Uniform Flow" Institut fuer Schiffbau der Universitat Hamburg 1996
8 van Berlekom, W. B., "Wind Forces on Modern Ship Forms-Effects on Performance" 97 (97): 123-134, 1981
9 Aage, C., "Wind Coefficients for Nine Ship Models" Hydro- and Aerodynamic Laboratory 1971
10 STAR-CCM+, "User’s Guide (Ver. 17.02)"
11 Andersen, O. J., "The Frøya Database and Maritime Boundary Layer Wind Description" 19 (19): 173-192, 2006
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24 Berto, K., "A Detailed Look into the 2017 SNAME OC-8Comparative Wind Load Study" 2019
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