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RISS 인기검색어
- 검색키워드
- 저자 : Bjørnar Pettersen (검색결과 3 건)
- 무료
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Lee, Seong-yeob,Jo, Choonghee,Pettersen, Bjørnar,Chung, Hyun,Kim, San,Chang, Daejun Elsevier 2018 Ocean engineering Vol.154 No.-
<P><B>Abstract</B></P> <P>This study proposes a pile-guided floater, a new mooring concept, for large offshore floating structures such as an offshore liquefied natural gas (LNG) bunkering terminal. The economic feasibility of the new mooring system was demonstrated through a cost–benefit analysis. The environmental loads acting on the floaters were computed using wave data at the target location. The mooring system was designed using finite element analysis to estimate the additional investment. An LNG ship-to-ship bunkering operation that included an LNG bunkering terminal, LNG carrier, LNG bunkering shuttle, and LNG receiving ship was adopted. To estimate the technical feasibility and economic benefit of the proposed mooring system, the availabilities of two types of LNG bunkering terminals were compared considering the acceptance criteria for LNG ship-to-ship transfers. One LNG bunkering terminal was a typical barge-type floater and the other was the pile-guided floater. The relative motion of the terminal with the LNG carrier and the LNG bunkering shuttle was analyzed. The limiting wave height was determined from the maximum relative vertical motion between the floaters at the position of the LNG loading arms. The availability of the pile-guided LNG bunkering terminal was significantly improved owing to the reduced vertical motion. Finally, a cost–benefit analysis verified that the new mooring concept for an offshore LNG bunkering terminal was economically feasible.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study proposes a pile-guide mooring system for an offshore LNG bunkering terminal. </LI> <LI> The economic feasibility of the new mooring concept was demonstrated through a cost-benefit analysis. </LI> <LI> The relative vertical motion of the floating bodies was analyzed to evaluate availability of LNG ship-to-ship transfer. </LI> <LI> Availability of the pile-guided LNG bunkering terminal was significantly improved by the cost-effective mooring structure. </LI> </UL> </P>
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Structures of turbulent open-channel flow in the presence of an air-water interface
Lee, Jin,Suh, Jungsoo,Sung, Hyung Jin,Pettersen, Bjørnar Informa UK (TaylorFrancis) 2012 Journal of turbulence Vol.13 No.-
<P>Direct numerical simulations (DNSs) of open-channel flows in the presence of an air-water interface were performed to examine the effects of interface deformation on the turbulence structures. In the water-driven turbulence, flows characterized by either of the two Froude numbers (Fr = 0.2 and 0.8) were examined and compared. A coupled level-set and volume-of-fluid (CLSVOF) method was employed to track the interface. The mean and root-mean-square of the air-water interface elevation varied rapidly with the spanwise distance as Fr increased. The air that contacted the water was entrained into the turbulent flow. At high Fr, all turbulent normal stresses on the air side of the interface were high near the sidewall. Two-point correlations between the streamwise vortex and the velocity fluctuations provided structural information about the near-wall streaky structures and the inner secondary flows in the cross-stream plane. Linear stochastic estimates of the conditionally averaged flow field showed that the inner secondary flow consisted of not only in-plane velocity components but also streamwise velocity components.</P>
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