FLBT에 작용하는 조류하중 특성에 관한 수치해석 연구

Abstract

We investigated the characteristics of current loads on a floating LNG bunkering terminal (FLBT) according to the heading angle in the range of 0° to 180°. In order to predict the current loads, RANS-based simulation was employed with the assumption of the double body model based on 1/250 scale ratio. Results of the current loads show a general tendency with regard to the heading angle. That is, the load in the transverse direction substantially increases, as the heading angle increases from 0° to 90°. In contrast, the load in the longitudinal one approaches nearly zero, and then increases with the opposite sign. For the cases (90° - 180°), these trends are inverse as expected. For validating the simulation, we compared numerical results with those in the experiment conducted by FORCE Technology. The computational results qualitatively show a good agreement with experimental ones. However, for the quantitative aspect, there is a significant discrepancy up to approximately 50% between both of them, which seems to be the excessive difference even though an uncertainty of the numerical simulation exists. For this reason, we suspect that the current loads measured in the experiment could be affected by the wind tunnel test environment such as an installed position of the model, a developed boundary layer and a roughness height of the model, leading to an over-prediction of the current loads.