A three-dimensional frequency-domain numerical method for predicting drift loads of multi-floating structures

A numerical method and structure technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as low spatial derivative accuracy, no commercial application, and complex implementation of high-order surface element methods. , to achieve the effect of improving the convergence rate

Active Publication Date: 2022-07-15
HARBIN ENG UNIV
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Problems solved by technology

The advantage of the constant value panel method is that the numerical implementation is simple, but the disadvantage is that the solution accuracy of the space derivative of the velocity potential at the non-smooth boundary is low; the high-order panel method just solves the shortcoming of the low precision of the space derivative; but the implementation of the high-order panel method is complicated , mostly in theoretical research, but not in commercial applications

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  • A three-dimensional frequency-domain numerical method for predicting drift loads of multi-floating structures
  • A three-dimensional frequency-domain numerical method for predicting drift loads of multi-floating structures
  • A three-dimensional frequency-domain numerical method for predicting drift loads of multi-floating structures

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Embodiment Construction

[0018] The present invention will be described in more detail with examples below.

[0019] 1) Read the grid file of each floating body in the multi-floating body structure to automatically extract the ship waterline information (including the spatial coordinates of the head and tail stagnation points, and the waterline fitting curve function). And distinguish between hull wet surface meshes and internal free surface meshes. Based on the discrete mesh of the hull, calculate the hydrostatic parameters such as the displacement volume, the center of buoyancy, the center of drift, the moment of inertia, and the wetted surface area. Check the error between the numerical results of the hydrostatic parameters and the parameters of the physical floating body, so as to check the quality of the ship grid.

[0020] 2) The present invention utilizes Taylor expansion boundary elements to solve each velocity potential component and its first-order and second-order derivatives in space. Th...

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Abstract

The invention provides a three-dimensional frequency domain numerical method for predicting the wave drift load of a multi-floating body structure. Read the grid file and use the grid information to calculate the hydrostatic force of the ship; calculate the influence coefficient matrix of the simple Green's function; calculate the influence coefficient matrix of the complex frequency-domain Green's function; apply the Taylor expansion boundary element method to solve the radiation velocity potential and surrounding The firing velocity potential and its spatial derivatives; the hydrodynamic coefficients of each unit of the multi-floating body structure; the equation of motion of the multi-floating body; the wave force and drift load of the whole of the multi-floating body structure and each unit; Carry out the analysis and calculation of the motion spectrum of floating bodies in irregular waves. The method of the invention can accurately predict the hydrodynamic coefficient, motion RAO, wave force, wave drift load in the six-degree-of-freedom direction and the motion spectrum analysis result of the floating body of each single body of the multi-floating body structure.

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical method for simulating the wave drift load of multi-floating structures by using the three-dimensional Taylor expansion boundary element method. Background technique [0002] Multi-floating structures are commonly found in offshore wind turbines; offshore hoisting, supply, salvage or ship formation. There is mutual interference between the floating bodies, and the most common one is the hydrodynamic problem of double floating bodies. Compared with the single floating body problem, its hydrodynamic coefficient, floating body motion response, and drift load must be affected by other floating bodies. The motion response of the multi-floating body structure and the parameters of the wave drift load have an extremely important influence on the design of the dynamic positioning system of the structure and the safety of offshore operations. [0003] There are three methods f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F30/23G06F111/10G06F113/08G06F119/14
CPCG06F30/18G06F30/20
Inventor 陈纪康段文洋
Owner HARBIN ENG UNIV
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