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Three-dimensional ocean wave analogy method based on ocean wave spectrum

A technology of three-dimensional ocean waves and simulation methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as unconsidered, inconsistent waves, etc.

Inactive Publication Date: 2013-03-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the ocean wave as a stochastic stationary process will inevitably lead to considering the wave formation process in isolation, without considering the influence of the interaction between two adjacent states of the ocean wave on the formation of the instantaneous ocean wave, which will inevitably lead to the simulated ocean wave being different from Reality does not match

Method used

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  • Three-dimensional ocean wave analogy method based on ocean wave spectrum
  • Three-dimensional ocean wave analogy method based on ocean wave spectrum
  • Three-dimensional ocean wave analogy method based on ocean wave spectrum

Examples

Experimental program
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Effect test

Embodiment 1

[0072] This embodiment includes the following steps:

[0073] The first step is to determine the observation time t and obtain the wave height at that time;

[0074] The second step is to take a certain moment when the sea surface is relatively calm before the observation time t as the observation time 0, and obtain the wave height at that time;

[0075] In the third step, on the basis of considering the time history of the wave formation, the correlation function of the wave is derived, and the attenuation weight function of the wave is calculated;

[0076] The fourth step is to multiply the wave height at time 0 by the attenuation weight function and superimpose it on the wave height at the observation time t, so as to reflect the influence of the waves at the previous moment on the waves at the observation time;

[0077] The fifth step is to change the angle initial phase of the direction spectrum function of the superimposed waves to simulate the change of wind direction;...

Embodiment 2

[0131] Taking the sea surface in a certain area of ​​the South my country Sea as an example, the representative wave height is 6m, and the average cycle is 12.5s. On the basis of Example 1, it can be obtained:

[0132] α=0.000665β=0.35ω 0 =2πf=0.503

[0133] When the wind speed u=36.7m / s

[0134] Take i=3, and take the instantaneous wave height of t as:

[0135] ξ(x y t)=R 1 ξ 1 (x y t)+R 2 ξ 2 (x y t 1 )+R 3 ξ 3 (x y t 2 )

[0136] in:

[0137] ξ 1 (x y t) is the instantaneous wave height directly generated at time t;

[0138] ξ 2 (x y t 1 ) is time t 1 the instantaneous wave height;

[0139] ξ 3 (x y t 2 ) is time t 2 wave height

[0140] According to the instantaneous wave height formula of ocean waves, the instantaneous wave height at time t can be obtained:

[0141] ξ 1 ( x y t ) = Σ i = 1 ...

Embodiment 3

[0158] Embodiment 3 is a variation of Embodiment 2.

[0159] When taking i=4:

[0160] According to the calculation of the weight function formula, it can be obtained

[0161] Pick R 4 = - 0.25 6.382 , R 3 = - 0.045 6.382 ,

[0162] R 2 = 1.607 6.382 , R 1 = 1

[0163] Simulate as Figure 4 , it can be seen from the figure that the simulated waves are gentler than those simulated by traditional simulation methods.

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Abstract

The invention discloses a three-dimensional ocean wave analogy method based on an ocean wave spectrum. The three-dimensional ocean wave analogy method based on an ocean wave spectrum includes confirming an observation time t and obtaining an ocean wave height at the moment, taking a relative calm moment of the ocean surface before the observation time t as an observation time 0 and obtaining an ocean wave height at the moment, deducing a relative correlation function of ocean waves based on considering the formation time history of the ocean waves and obtaining an attenuation weight function of the ocean waves through calculation, multiplying the ocean wave height of the observation time 0 by the attenuation weight function and superposing the result to the ocean wave height of the observation time t thus reflecting the influence of a previous moment ocean wave on the ocean wave of an observation time, changing an angle initial phase of an orientation spectral function of superposed ocean waves to imitate the changes of wind directions. Repeat the steps of the three-time dimensional ocean wave analogy method, and ocean superpositions of a plurality of moments are obtained and finally the imitation of ocean waves is obtained. The three-dimensional ocean wave analogy method based on ocean wave spectrum utilizes the steps to imitate the ocean waves. The imitated effect of the ocean waves is less in distortion compared with the prior art and fits with real ocean waves.

Description

technical field [0001] The invention relates to the field of fluid numerical simulation, in particular to a three-dimensional ocean wave simulation method based on ocean wave spectrum. Background technique [0002] (1) There are three ways to study ocean waves and their effects on engineering: one is on-site observation research; the other is simulation research in the laboratory; the third is theoretical analysis and research. Due to the complexity and variability of ocean waves and the harsh on-site environment, it takes a lot of manpower and material resources to conduct on-site observations; theoretical research also has relatively large limitations, especially for irregular waves, and many problems depend on indoor simulation research. With the development and popularization of electronic computers, the numerical simulation of ocean waves has developed rapidly. It has the advantages of economy and convenience, and is increasingly valued and widely used by people. [00...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 马春翔郑茂琦王志波高峰
Owner SHANGHAI JIAO TONG UNIV
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