Simulation of Floating Body in Nonlinear Wave by Vortex Methods

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  • Okubo Shigeki
    日立造船(株) 海洋プロジェクト部(佐賀大学大学院)
  • Nagata Shuichi
    佐賀大学海洋エネルギー研究センター
  • Imai Yasutaka
    佐賀大学海洋エネルギー研究センター
  • Niizato Hideyuki
    日立造船(株) 環境・ｴﾈﾙｷﾞｰﾌﾟﾗﾝﾄ本部 開発ｾﾝﾀｰ

Bibliographic Information

Other Title
  • 渦法による浮体構造物の非線形波浪中挙動解析法の開発
  • 渦法による浮体構造物の非線形波浪中挙動解析法の開発(第2報)矩形および三角形浮体の2次元動揺問題
  • ウズホウ ニ ヨル フタイ コウゾウブツ ノ ヒセンケイ ハロウ チュウ キョドウ カイセキホウ ノ カイハツ(ダイ2ホウ)クケイ オヨビ サンカクケイフタイ ノ 2ジゲン ドウヨウ モンダイ
  • －第２報：矩形および三角形浮体の２次元動揺問題－
  • - Part2, Simulation of 2-Dimensional Rectangle and Triangle Floating Body Motion -

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Abstract

To design floating body such as a floating wind power generation, it is necessary to develop the calculation method to estimate the effect of the fin installed in order to reduce the motions of the body and the behavior of the floating body in resonance frequency. The purpose of our study is to develop the numerical simulation method with high accuracy to represent the behavior of floating body in nonlinear wave by using vortex method. <br>In this paper, motions of moored rectangular and triangular floating bodies in waves are calculated by the vortex method based on the Core-Spreading method. To calculate the vorticity generation from the body surface, the vorticity layer and the vorticity shedding models are used. And total pressure acting on the body is calculated by using the boundary integral equation represented by the velocity and the vorticity, deduced from fundamental equations of viscous fluid. The calculated motion amplitudes of the moored body in waves are compared with the experimental results and the calculated results by the vortex method agree well with the experimental results.

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