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Ship motion prediction method based on Taylor expansion boundary element method

A technology of ship motion and boundary element, applied in the field of simulation, can solve complex problems

Active Publication Date: 2019-03-08
HARBIN ENG UNIV
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Problems solved by technology

Because the DB free surface condition is designed to calculate the second derivative of the stack potential, it is more complicated than the NK free surface condition

Method used

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  • Ship motion prediction method based on Taylor expansion boundary element method
  • Ship motion prediction method based on Taylor expansion boundary element method
  • Ship motion prediction method based on Taylor expansion boundary element method

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Embodiment Construction

[0021] The following examples describe the present invention in more detail.

[0022] 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.

[0023] 2) The present invention uses Taylor expansion boundary elements to solve each velocity potential component ...

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Abstract

The invention provides a ship motion prediction method based on a Taylor expansion boundary element method. The method comprises the steps of reading the grid file and carrying out hydrostatic calculation; calculating the influence coefficient matrix of a boundary integral equation needed by the taylor expansion boundary element method; solving the velocity potential of laminated modes and its spatial first and second derivatives and Mj terms; solving the green's function in time domain and its spatial derivative; solving the instantaneous terms of radiation velocity potential and their spatial first and second derivatives; solving the radiation velocity potential memory term and its spatial first and second derivatives; solving the impulse response function of added mass, wave-making damping and radiation wave force; solving the impulse response function of whole wave incident velocity potential; diffraction velocity potential and its first and second derivatives in space, solving theimpulse response function of diffraction wave force; solving the ship motion in full wave direction; analyzing and calculating the ship motion spectrum under different sea conditions. The invention can predict the hydrodynamic coefficients of three main ship types, wave loads, six-degree-of-freedom motion of the ship in full wave direction, and ship motion spectrum analysis under various sea conditions.

Description

technical field [0001] The invention relates to a simulation method, in particular to a method for calculating steady and unsteady velocity potential impulse response functions by using the Taylor expansion boundary element method, and then forecasting the full-wave three-dimensional ship motion RAO. Background technique [0002] Ship seakeeping has always been an important ship performance index that ship designers pay attention to, and has an important impact on the safety of cargo, passenger comfort, and ship energy consumption. However, developing a 3D ship motion prediction software suitable for any ship type is still a difficult point in hydrodynamics research. [0003] The stern of the container ship is a large floating ship, and there is a problem of numerical divergence when using the time-domain Green's function method to solve the problem. Therefore, the simple Green's function method is used for the time domain prediction of the large floating ship's motion. Bo...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20Y02T90/00
Inventor 陈纪康段文洋
Owner HARBIN ENG UNIV
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