巻波による波浪衝撃現象の数値実験

概要

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Numerical simulations of the plunging wave impact on a vertical plane wall were performed. The trapped air impact was mainly considered. For the simulation, BEM based on Cauchy's integral theorem was used to solve the governing equation of water and the mixed Eulerian-Lagrangian method was used to update the free-surface profile. The internal free-surface bounding on the trapped air was also updated in the same manner. To compute the air impact pressure, adiabatic and uniform air compression was assumed. To simulate the wave impact with air trapping, the vertical wall must be located within the wave breaking region. Three different wall locations within this region were selected to study the influence of wall location to the impact pressure. The scale of the trapped air impact is defined by the ratio of the characteristic air pressure to the characteristic hydrostatic pressure. Successful simulations with four different ratios for each wall location were done and the peak air impact pressures for each combination of the ratio and wall location were obtained. The reliability of the simulations was checked by comparison between experiment of Chan & Melville and the simulation. With these numerical results, the scaling law of the trapped-air impact pressure was discussed and the practical formula of the peak air impact pressure and its rise time was presented.
社団法人日本船舶海洋工学会の論文
1992-09-25