Computer Science ›› 2013, Vol. 40 ›› Issue (7): 283-288.

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On Selection and Parameter Calculation of Wave Spectra in Ocean Wave Rendering

CHEN Li-ning,JIN Yi-cheng,REN Hong-xiang and ZHANG Xiu-feng   

  • Online:2018-11-16 Published:2018-11-16

Abstract: The structure of Phillips wave spectra was analyzed.Phillips spectra is directional spectra,and can be separated into the frequency spectra and directional spreading function.Its frequency spectra accords with the Neumann spectra form,and is familiar with P-M spectra.Its directional spreading function is the function recommended by International Towing Tank Conference.By referencing P-M spectra,the wind speed of Phillips spectra is specified and its constant is calculated,which solves the unsettled problems in application.By comparing the rendering results of PM-ITTC directional spectra and Phillips spectra,it is found that long waves with low frequency band are more obvious in ocean wave rendered with Phillips spectra.Additionally,the study shows the peak spectral frequency of Phillips spectra is close to that of PM-ITTC directional spectra,but its spectral width is smaller and its wave energy more concentrates in low frequency band.Fetch length is added as a parameter of Phillips spectra.So the rendering result can reflect the influence of both wind speed and fetch length on rendered ocean wave.The propagation direction and wave height of the rendered ocean wave vary as wind speed changes,which conforms to the actual condition in navigation.The method is used in navigation simulator.

Key words: Ocean wave rendering,Phillips wave spectra,Directional spreading function,Wind speed,Fetch length

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