一様流中の振動円柱における同期現象の数値解析　移動境界問題の解析手法の検討

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  • Numerical Analysis for Lock-In Phenomenon of Vibrating Cylinder in Uniform Flow. Investigation of Analyzing Technique for Moving Boundary Problem.
  • イチヨウリュウチュウ ノ シンドウ エンチュウ ニ オケル ドウキ ゲンショウ

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It is well known that a cyclic Karman vortex street is periodically thrown out from a cylinder whose axis is vertical to the bulk flow. When the cylinder is vibrated at a frequency close to that of the Karman vortex street, the frequency is locked in to that of the cylinder. While there are many experimental studies of this phenomenon, analytical studies by numerical calculation are few. In this study, a new algorithm for a moving boundary problem is proposed, and a simulator, which can deal with this phenomenon is developed. The simulator is based on the boundary-fit method and MAC method. This lock-in phenomenon is analyzed by it and the following results are obtained. The lock-in phenomenon is confirmed to exist by this simulator. The bandwidth of the frequency in which it is locked in coincides with that from experimental results. For the near-wake of the cylinder, the velocity profile corresponds to the experimental one.

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