斜波中を航走する肥大船に働く波力について (第2報)

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タイトル別名
  • Wave Forces Acting on a Blunt Ship with Forward Speedin Oblique Sea (2nd Report)
  • シャハチュウ オ コウソウスル ヒダイセン ニ ハタラク ハリョク ニ ツ

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抄録

The numerical and experimental studies on the wave forces acting on a blunt ship advancing in oblique waves were presented in the preceding report. A 3-D panel method was mainly investigated for the numerical scheme, and it was confirmed that the 3-D panel method is useful to predict the wave forces comparatively in long waves. These studies are for the wave forces obtained by integrating the wave pressure over the ship surface, and therefore the genuine three-dimensional effect can not be observed explicitly because of the integral effect. In order to make clear the advantages of the three -dimensional calculation and grasp the mechanism of the local wave field, the investigation relating to the pressure distribution on the ship surface is necessary.<BR>The pressure distributions on the ship surface are investigated in this paper. The numerical predictions are carried out by means of the 3-D panel method, and the results are compared with the experimental results and other numerical results based on the strip theory. From the above results, it was confirmed that the 3-D panel method predicts accurately the wave pressure on the ship surface comparatively in long waves, and overestimates the wave pressure especially on the stern part of the ship in oblique short waves. The latter justifies the phenomenon, obtained in the preceding report, that the 3-D panel method overestimates the wave exciting forces compared with the experiments. In addition to this, some investigations are also carried out for the reason why 3-D panel method overestimates the wave exciting forces and wave pressure on the ship surface.

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