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A three-dimensional numerical simulation method for ship large-scale rolling motion

A technology of three-dimensional numerical and simulation methods, applied in the field of simulation, which can solve problems such as numerical divergence

Active Publication Date: 2019-02-12
HARBIN ENG UNIV
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Problems solved by technology

[0004]The stern of the container ship is a large floating ship type, and there is a numerical divergence problem when using the time domain Green's function method to solve the problem

Method used

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  • A three-dimensional numerical simulation method for ship large-scale rolling motion
  • A three-dimensional numerical simulation method for ship large-scale rolling motion
  • A three-dimensional numerical simulation method for ship large-scale rolling motion

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Embodiment Construction

[0020] The following examples describe the present invention in more detail.

[0021] 1) Read the grid file and automatically extract the waterline information of the ship (including the spatial coordinates of the stagnation point at the head and tail, and the fitting curve function of the waterline). Combining the intelligent parameters of flow field matching boundary and waterline information, the discrete mesh of water surface and matching surface conforming to the boundary element method is automatically generated. And based on the discrete grid of the hull, calculate the hydrostatic parameters of the ship, such as displacement volume, buoyancy center, buoyancy center, moment of inertia, wet surface area, etc. Check the error between the numerical results of the hydrostatic parameters and the physical ship parameters to verify the quality of the ship mesh.

[0022] 2) The present invention uses Taylor expansion boundary elements to solve each velocity potential component ...

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Abstract

The invention provides a three-dimensional numerical simulation method for ship large-scale rolling motion, which comprises the following steps of reading a grid file to carry out ship hydrostatic calculation; calculating an influence coefficient matrix of boundary integral equation for Taylor expansion boundary element method; solving velocity potential of laminated modes and its spatial first and second derivatives and mj terms; carrying out the green's function in time domain and its spatial derivative solution; calculating a roll damping coefficient; carrying out the irregular wave decomposition, linear superposition into incident wave time calendar; carrying out the direct time-domain disturbance wave force calculation by taylor expansion boundary element method; calculating incidentwave force and hydrostatic recovery force; modeling a large-scale motion forecasting equation; using the fourth-order runge-kutta method to solve the motion equation step by step to evaluate the nonlinear motion of the ship in the top wave or oblique wave; and carrying out the numerical simulation and characteristic statistics of ship large amplitude motion in irregular waves. The method of the invention can predict the large amplitude motion of a container ship in regular waves and irregular waves, and can be used for numerical simulation and characteristic statistics of the large amplitude motion of a ship in irregular waves.

Description

technical field [0001] The invention relates to a simulation method, in particular to a method for simulating large-scale rolling motion of a ship by using a three-dimensional Taylor expansion boundary element method. Background technique [0002] Ships with drastic fore and aft changes are prone to parametric rolling, that is, large rolling motions, under certain sea conditions. In particular, container ships are extremely prone to this phenomenon. Once the parametric rolling phenomenon occurs on the ship, it will bring loss to the cargo and affect the safety of the ship. Therefore, the probability statistics of ship parametric roll phenomenon is a hot spot in hydrodynamics research. [0003] In the numerical simulation of ship motion prediction, it is necessary to consider the influence of the steady superimposed mode potential on the unsteady velocity potential. Therefore, the implementation of free surface conditions also has an impact on the accuracy of numerical pre...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20Y02T90/00
Inventor 陈纪康段文洋
Owner HARBIN ENG UNIV
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