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You are here : eLibrary : Ice Research and Engineering : 23rd Symposium USA (2016) : Ice on Ships : Numerical Simulation of Turret Ship Dynamic Behaviour under External Action
Numerical Simulation of Turret Ship Dynamic Behaviour under External Action
Author : Karulin, Evgeny and Marina Karulina
Turret ship is one of the moored floater types which can be used in arctic regions both as mobile platforms (for drilling or for exploration) and as stationary ones (floating plants or oil and gas storage). At designing of these floaters and their mooring system, it is necessary to assess a level of potential external action on the ship as well as her response on it. The purpose of performed work was an analytical investigation of turret ship behaviour under joint action of external forces –wind, current and broken ice. The study considers a turret ship hull whose dimensionsapproximately match one of the FPSO design options for Shtokman field. The paper looks atthree scenarios of environmental effects on the turret ship on this field: 1) ship turning about theturret using her thrusters in a field of immovable managed ice; 2) ship weathervaning underwind, current and managed ice effects acting from different directions; and 3) ship behaviourunder the effect of Sverdrup’s tidal wave. All the parameters of external factors – current, windand their change were in accordance with corresponding data of Shtokman field. The broken icecover was assumed to consist of floes of sizes ranging from 20 m to 40 m, with thickness of 1 m.The initial concentration was 72%. Two locations of the turret along the ship length werestudied. The broken ice action was determined using 2D discrete element approach. The resultsgive time variation of kinematic parameters of the turret ship motion – course angle, the shipCOG and turret center trajectories, as well as of turret mooring system restoring force.
File Size : 1,577,534 bytes
File Type : Adobe Acrobat Document
Chapter : Ice Research and Engineering
Category : 23rd Symposium USA (2016)
Article : Ice on Ships
Date Published : 20/10/2016
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