Three-dimensional frequency domain numerical method for predicting wave drift load of a multi-floating body structure

Abstract

The invention provides a three-dimensional frequency domain numerical method for predicting wave drift load of a multi-floating body structure. The method comprises the following steps: Reading the mesh file, using the mesh information to carry on the ship hydrostatic calculation; calculating The influence coefficient matrix of simple Green's function Calculating The influence coefficient matrix of complex frequency domain Green's function. Taking The Taylor expansion boundary element method solve the unit radiation velocity potential, diffraction velocity potential and their spatial derivatives. solving Hydrodynamic Coefficients of Multiple Floating Body Structures; solving multi-floating body motion equation; solving The wave forces and wave drift loads of each unit for the whole multi-floating structure. According to the response RAO of floating body motion, anyalzing and calulating the floating body motion spectrum in irregular waves. The method of the invention can accurately predict hydrodynamic coefficients, motion RAO, wave forces, wave drift loads in a six-degree-of-freedom direction of each unit of a multi-floating body structure and results of floating body motion spectrum analysis.

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical method for simulating wave drift loads of multi-floating body structures by using a three-dimensional Taylor expansion boundary element method. Background technique [0002] Multi-floating body structures are commonly found in offshore wind turbines; offshore hoisting, replenishment, salvage or ship formation. There is mutual interference among the floating bodies, and the most common problem 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 wave drift load parameters have an extremely important impact on the design of the dynamic positioning system of the structure and the safety of offshore operations. [0003] There are three metho...

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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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