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Method for predicting movement of FLNG (floating liquefied natural gas) by considering rocking influence of liquid cabin

A liquid tank sloshing and liquid technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of not paying attention to the coupling influence of hull motion, and difficult to consider the influence of hull motion, so as to improve design efficiency and save Calculation time, accurate effect of free surface model

Inactive Publication Date: 2014-08-13
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Although the simulation calculation can simulate the sloshing of the liquid in the cabin, it is still difficult to consider the influence of the hull motion
Traditional studies on sloshing did not pay attention to the coupling effect with the hull motion

Method used

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  • Method for predicting movement of FLNG (floating liquefied natural gas) by considering rocking influence of liquid cabin
  • Method for predicting movement of FLNG (floating liquefied natural gas) by considering rocking influence of liquid cabin
  • Method for predicting movement of FLNG (floating liquefied natural gas) by considering rocking influence of liquid cabin

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Embodiment

[0048] The following examples are implemented on the premise of the technical solutions of the present invention, and detailed implementation methods and processes are given, but the protection scope of the present invention is not limited to the following examples.

[0049] The invention provides a method for forecasting the movement of a ship, the steps of which include: firstly, calculating the velocity potential of liquid flowing in a rectangular liquid tank within a time step. Second, the acceleration potential is introduced, the boundary value problem about the acceleration potential is established, and the pressure of the fluid on the bulkhead is obtained. Third, establish the boundary value problem of the hull motion, obtain the velocity potential, wave force, damping coefficient and delay function, and establish the equation of motion. Fourth, solve the equation of motion to obtain the position and velocity of the ship. Numerical simulations are carried out by using ...

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Abstract

The invention relates to a method for predicting the movement of FLNG (floating liquefied natural gas) by considering the rocking influence of a liquid cabin. The method comprises the following steps of 1) describing non-linear rocking of liquid in the cabin in a time domain based on a potential flow theory and a panel method to obtain the velocity potential of the rocking of the liquid in the cabin and the pressure of the liquid on the cabin wall caused by the rocking; 2) using the pressure obtained in the step 1) as external force input at the right end of an equation of motion of a ship body, considering the influence of external wave force, calculating motion response of the ship body, obtaining the position of the ship body, and updating a free liquid level; 3) using the obtained position of the ship body at the current moment and the updated free liquid level as boundary conditions of the rocking problem of the liquid in the cabin to obtain the rocking problem of the liquid in the cabin at the next moment, circulating continuously, and stopping after time is set. Compared with the prior art, the method has the advantages of shortening computation time, greatly improving the design efficiency of the liquid cabin and the FLNG and the like.

Description

technical field [0001] The invention relates to a ship movement forecast, in particular to a FLNG (large floating liquefied natural gas ship) movement forecast method considering the impact of liquid tank sloshing. Background technique [0002] As we all know, the shortage of oil resources and the increasing demand for energy have led to the large-scale development of offshore oil and gas fields, and the development of offshore marginal gas fields has also been put on the agenda. In order to economically and effectively develop offshore marginal oil and gas fields, the concept of large floating liquefied natural gas carrier (hereinafter referred to as FLNG) has been proposed internationally. The huge volume of FLNG will be moored in the operating sea area for a long time, and will experience complex marine environmental conditions and various liquid loading conditions in the tank. Harsh marine environmental conditions will cause violent movement of FLNG, which will cause sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 胡志强杨建民赵文华王舒雅
Owner SHANGHAI JIAO TONG UNIV
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