Investigation on the Natural Modes of A Semi-Closed Floating Tank  

作　　者：WANG Guo KONG Yao-hua GE Jun-bo MA Yu-xiang SUN Lei 

机构地区：[1]State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Marine Design and Research Institute of China,Shanghai 200011,China [3]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《China Ocean Engineering》2023年第4期580-587,共8页中国海洋工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51979029)。

摘　　要：Vessels with semi-closed tanks(i.e.,well docks)are widely applied in the military operation and maritime engineer-ing.The water is bound by the semi-closed floating tank and forced by both the incident waves and ship’s motions.The free surface oscillations inside the flooded well dock is thus distinctive and very complicated.So far,the natural modes of semi-closed floating tanks have not yet been studied.This paper investigates the characteristics of natural modes of a floating semi-closed tank by combining a mode-resolving model based on mild-slope equations and a hydrodynamic model based on computational fluid dynamics.Results show that the first three natural periods(i.e.,74,23.6,and 14 s)of the tank fall into the band of swell and infragravity waves and they could be triggered under certain circumstance.Multi-period free surface oscillations are observed inside the tank,including the longest natural period(i.e.,74 s),though the incident waves are monochromatic.A possible generation mechanism for the long-period mode is explained on the basis of liquid sloshing and harbor oscillations.Moreover,a long-period component with a period close to the natural mode of well dock is observed in the ship motions,which is generated by the interaction between the waves and ship.

关 键 词：floating semi-closed tank water free surface oscillations natural period natural mode mild-slope equa-tions computational fluid dynamics 

分 类 号：U661[交通运输工程—船舶及航道工程] P75[交通运输工程—船舶与海洋工程]