NUMERICAL ANALYSIS OF DIFFRACTED WAVE FORCE ACTING ON A SUBMERGED SPHERE

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  • 没水球体に作用する回折波力の数値解析
  • ボッスイ キュウタイ ニ サヨウスル カイセツ ハリョク ノ スウチ カイセキ

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Abstract

This study is to discuss the wave force acting on a submerged sphere due to the diffracted wave based on a numerical analysis. The hybrid method is employed to calculate the velocity potential of the diffracted wave.<br>The added mass coefficient, the force coefficients, the dominant range of the diffraction force are investigated in relation to the wave height distribution and non-dimensional parameters such as the relative sphere radius to the wave length, ka, the relative sphere diameter to water depth, D/h, and the relative submergence, d/h. The wave diffraction is governed by ka, D/h and d/h. The effect of wave diffraction to the vertical wave force is generally larger than that to the horizontal one. The added mass coefficient becomes larger with an increment of D/h and with decreasing of d/h for the same ka. When the change of wave heights is less than 5%, the diffracted wave has little effect to the wave force. The range in which the diffraction theory is applied in calculating the wave force is given graphically as a function of ka, d/h and D/h.

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