Numerical Study on the Improvement of the Motion Performance of a Light Buoy
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A light buoy is equipped with lighting functions and navigation signs. Its shape and colors indicate the route to vessels sailing nearby in the daytime, with its lights providing this information at night. It also plays a role in notifying the presence of obstacles such as reefs and shallows. When a light buoy operates in the ocean, the visibility and angle of light from the lantern installed on the buoy changes, which may cause them to function improperly. Therefore, it is necessary for the buoy to have stable and minimal motions under given environmental conditions, mainly waves.In this study, motion analyses for a newly developed lightweight light-buoy in waves were performed to predict the motion performance and determine the effect of the developed appendages for improving the motion performance. First, free decay tests, including benchmark cases, were performed using computational fluid dynamics (CFD) to estimate the viscous damping coefficients, which could not be obtained using potential-based simulations. A comparison was made of the results from potential-based simulations with and without considering viscous damping coefficients, which were estimated using CFD. It was confirmed that the pitch and heave motions of the buoy became smaller when the developed appendages were adopted.
Abstract
A light buoy is equipped with lighting functions and navigation signs. Its shape and colors indicate the route to vessels sailing nearby in the daytime, with its lights providing this information at night. It also plays a role in notifying the presence of obstacles such as reefs and shallows. When a light buoy operates in the ocean, the visibility and angle of light from the lantern installed on the buoy changes, which may cause them to function improperly. Therefore, it is necessary for the buoy to have stable and minimal motions under given environmental conditions, mainly waves.In this study, motion analyses for a newly developed lightweight light-buoy in waves were performed to predict the motion performance and determine the effect of the developed appendages for improving the motion performance. First, free decay tests, including benchmark cases, were performed using computational fluid dynamics (CFD) to estimate the viscous damping coefficients, which could not be obtained using potential-based simulations. A comparison was made of the results from potential-based simulations with and without considering viscous damping coefficients, which were estimated using CFD. It was confirmed that the pitch and heave motions of the buoy became smaller when the developed appendages were adopted.
참고문헌 (13)
- Bhattacharyya, R., "Dynamics of Marine Vehicles" (1978), Wiley
- Hong, K. Y., "An Experimental Method for Analysis of the Dynamic Behavior of Buoys in Extreme Environment", Journal of Ocean Engineering and Technology, 15(3), pp.134~141 (2001)
- 정대성, "EPP적용 LL-24형 경량화 등부표의 운동 안정성 평가", 공학기술논문지, 10(3), pp.297~303 (2017), 공학기술연구원[DOI]
- Journée, J. M. J., "Offshore Hydromechanics", Delft University of Technology, ~ (2001)
- 김민규, "규칙파 중 사각형 부유식 구조물의 횡동요 운동특성에 대한 연구", 한국해양공학회지, 33(2), pp.131~138 (2019), 한국해양공학회[DOI]
- 김남우, "감쇠계수 산출을 위한 자유 횡동요 감쇠실험 연구", 대한조선학회 논문집, 52(6), pp.460~470 (2015), 대한조선학회
- 고행식, "OpenFOAM을 이용한 부유식 구조물의 운동해석", 한국전산유체공학회지, 23(1), pp.101~112 (2018), 한국전산유체공학회[DOI]
- 고행식, "OpenFOAM을 이용한 편심 원형실린더 파력발전장치의 비선형 운동해석", 한국전산유체공학회지, 23(3), pp.18~26 (2018), 한국전산유체공학회[DOI]
- Koh, H. J., "Heave Motion Response of a Circular Cylinder with the Dual Damping Plates", Ocean Engineering, 125, pp.95~102 (2016)[DOI]
- 고혁준, "감쇠판에 의한 원기둥의 상하운동 저감 모형시험", 한국해양공학회지, 27(4), pp.76~82 (2013), 한국해양공학회
- Palm, J., "Coupled Mooring Analysis for Floating Wave Energy Converters using CFD : Formulation and Validation", International Journal of Marine Energy, 16, pp.83~99 (2016)[DOI]
- 손보훈, "7마일 등명기를 결합한 경량화 등부표의 운동 해석", 해양환경안전학회지, 24(5), pp.628~636 (2018), 해양환경안전학회[DOI]
- 석준, "전산유체역학을 이용한 해양작업지원선의 빌지킬 유무에 따른 횡동요 성능에 관한 연구", 한국마린엔지니어링학회지, 40(9), pp.791~798 (2016), 한국마린엔지니어링학회[DOI]