TIME DOMAIN ANALYSIS ON HYDROELASTIC RESPONSE OF LARGE SCALE FLOATING STRUCTURE UNDER ARBITRARY WAVE CONDITIONS

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  • 任意波浪場に於ける大型浮体の弾性応答に関する時間領域解析
  • ニンイ ハロウジョウ ニ オケル オオガタフタイ ノ ダンセイ オウトウ ニ カンスル ジカン リョウイキ カイセキ

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Abstract

A numerical method is developed to analyze the hydroelastic responses of large-scale floating structure under waves. BEM is applied to evaluate the fluid motion and FEM to analyze the deformation of structure. By satisfying the continuity of the pressure and displacement on fluid-structure interface, the dynamic wave-structure interaction is simulated. A time domain solution under arbitrary wave condition is obtained just by prescribing the conditions on wave generation boundary for each time step, and this method is applicable to the cases with varied sea-bottom configuration and distributed structural mass or stiffness. The effect of space and time discretizations on the convergence and stability of solution for regular, random and solitary waves is discussed by comparing among numerical solutions. The validity of the present method is verified by comparing with experimental results for the three kind of waves mentioned above. Furthermore, the fission of a solitary wave under a large-scale flexible floating structure has been observed both in numerical analysis and experiment.

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