Alternative Title有限差分法と後流振動子モデルを用いた柔軟細長構造物の渦励振に関する数値的研究
Note (General)Several research efforts have been directed toward the development of modelsfor response prediction of slender structure such as flexible risers influencedby vortex-induce vibrations. The main difficulties arise from the fact that thedynamic response of flexible risers involves a highly nonlinear behavior andevaluating the vortex-induced forces acting on the structure. This doctoralthesis proposes a numerical simulation method for the dynamic motion of aflexible riser pipe undergoing vortex-induced vibration (VIV). The method isbased on a finite difference scheme for solving nonlinear structural dynamicsof the pipe and a wake oscillator model for quantifying vortex-induced forcesacting on the pipe. The combination of which can offer a very efficient andstable computation. To investigate the accuracy of the method, simulationsof the VIV of riser pipes under uniform flow and sheared flow conditions wereperformed; and then obtained results were compared with experiments of precedingworks. Numerical results were compared with experimental data showinggood agreement in response of amplitude, mode shape and frequency ofdisplacement.It is confirmed that the present method can simulate a couple of importantaspects of the VIV of the pipes by using finite difference method and wakeoscillator model.
Collection (particular)国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
Date Accepted (W3CDTF)2016-08-04T09:59:51+09:00
Data Provider (Database)国立国会図書館 : 国立国会図書館デジタルコレクション