Ship hydrodynamic-force predicting method and system based on wet surface grid of ship body in wave

Abstract

The invention discloses a ship hydrodynamic-force predicting method and system based on a wet surface grid of a ship body in a wave. The ship hydrodynamic-force predicting method comprises the following steps: reading data points of the ship; carrying out reverse calculation on three B-spline expressions of waterlines according to the data points on all the waterlines; calculating a generalized section curve of the outline of the ship body based on the three B-spline expressions of the waterlines; determining the type of the wave and an expression of the wave surface, searching for an interaction point between the generalized section curve and the instantaneous wave surface according to the type of the wave and the expression of the wave surface, and then acquiring the wet surface grid of the ship body in the wave; and predicting the hydrodynamic force on the ship in the wave based on the wet surface grid of the ship body in the wave.

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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