Ship hydrodynamic prediction method and system based on wet hull surface mesh in waves

Abstract

The present disclosure discloses a ship hydrodynamic prediction method and system based on the wet surface grid of the hull in waves, and reads the model value points of the ship; according to the model value points on each waterline, the cubic B-spline expression of the waterline is back-calculated ; Based on the cubic B-spline expression of the waterline, calculate the generalized section curve of the hull shape; determine the type of wave and the expression of the wave surface, and find the intersection point of the generalized section curve and the instantaneous wave surface according to the type of wave and the expression of the wave surface, Then, the wet surface mesh of the hull in waves is obtained; based on the wet surface mesh of the hull in waves, the hydrodynamic force on the ship in waves is predicted.

Description

technical field [0001] The present disclosure relates to the technical fields of ship engineering and marine engineering, in particular to the division of wet surface grids of a ship in waves and the prediction of ship hydrodynamics. Background technique [0002] The statements in this section merely mention background art related to the present disclosure and do not necessarily constitute prior art. [0003] In the process of realizing the present disclosure, the inventors found that the following technical problems existed in the prior art: [0004] In the process of ship design, the surface element method is often used to predict the hydrodynamic performance of ships. The division of the hull wet surface mesh is the first step in the calculation of the surface element method. A well-divided grid not only affects the accuracy of the calculation results, but sometimes even directly affects the success or failure of the calculation. At present, there are two main methods ...

AI Technical Summary

Problems solved by technology

However, there are two common problems in the current related research. The first is that the model points of the hull need to be preprocessed before using the spline function to fit the hull surface (such as the division of the hull surface surface patch, the encryption of the model points, etc.) , this process is often cumbersome; another problem is that currently reported methods tend to only address hydrostatic conditions, where the wetted surface area of ​​the ship is constant

For the wet surface of the ship that changes instantaneously in waves, it is often difficult to give an ideal grid division by applying existing methods

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