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

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...

AI Technical Summary

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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