A Method of Pushing Plates to Create Random Waves

Abstract

The invention discloses a method for pushing plate to create random wave, which comprises the following steps: (1) establishing a numerical wave flume; (2) adding a moveable pushing plate with certain thickness to the wave creating end Xmin at the flume and adding porous medium to the end part as a wave silencing structure; (3) obtaining random wave parameters; (4) determining whether it is the first random wave; (5) generating random initial phase; (6) according to the obtained dum5 value, determining a P-M spectrum or a Jonswap spectrum; (7) calculating the wavelength L at this time;(8) calculating the Jonswap spectrum;(9) on the basis of the linear system theory, calculating a frequency responding function;(10) based on the above calculations of initial phase value, the spectrum function value, and the frequency responding function value and according to the superposition theory of linear wave, calculating the displacement speed of the pushing plate, and generating the random wave according to the speed of the pushing plate at which the pushing plate is controlled to move. According to the method of the invention, the end part is added by porous media to serve as a wave structure, which solves the problem that the wave creation water rises in size in a closed boundary closed boundary. With a closed boundary numerical wave flume, water exchange can be simulated. The method finds wide applications.

Description

Technical field [0001] The invention relates to the field of wave numerical simulation simulation, in particular to a method of pushing a plate to create random waves in this field. Background technique [0002] In the field of wave numerical simulation in recent years, the simulation of random waves has become a hot topic. At present, the simulation of random waves is generally completed by simulating the target spectrum. The parameters such as effective wave height (Hs) and period (T) actually measured in the project are brought into a specific form of wave spectrum (such as Jonswap spectrum) , Obtain the target spectrum of the ocean wave spectrum, and simulate the random wave with the spectrum consistent with the target spectrum according to the target spectrum. [0003] The method for realizing random wave simulation in the prior art has certain limitations. Specifically, when using P-M spectrum to generate random waves, the formula of P-M spectrum is: among them Is the angu...

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Problems solved by technology

[0005] In addition, due to the limitation of the wave-making algorithm, the end of the numerical tank used for wave numerical simulation generally adopts an open boundary (outflow). If a closed boundary (wall) is used, the volume of the water body in the calculation domain will increase rapidly, thus affecting the accuracy of the calculation. Inability to simulate the water quality exchange of a closed harbor basin if closed boundaries cannot be used, and the application range is narrow

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