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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>.
SNUFOAM을 이용한 2차원 선박단면 형상의 입수 충격에 대한 연구
장동진(D.J. Jang),최영민(Y.M. Choi),최학규(H.K. Choi),이신형(S.H. Rhee) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.3
Nowadays, large container ships are continually developed and that’s why the bow and stern structural stability problems by slamming become a significant more and more. However, due to the complexity of slamming, it is difficult to consider those problems at the design stage. For this reason, we attempt numerical analysis through SNUFOAM by generating the bow and stern two-dimensional cross-sectional grid in WILS JIP experiment at KRISO. Unlike the conventional method for the computation time saving, by setting the inlet flow conditions referred to the model test, we analyzed the slamming without applying the grid deformation method. As a result, when the stern model, as in the previous studies, it was possible to obtain quantitatively the fluid impulse is close to the experimental results. When the bow model, we can found the change by the position of force sensors which are derived for the bulbous bow and obtained fluid impulse and flow shape at slamming similar to the model test.