ALE有限要素法による二次元の旗のはためき問題の流体・構造連成解析

概要

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It was found in a recent experiment done by J. Zhang and co-workers that a flexible filament in a flowing soap film can exhibit three states-the stretched-straight state, the flapping state, and the bistability. When this experimental model is regarded as a one-dimensional flag in a two-dimensional fluid flow, their findings contradict the common idea that flags always flap in a wind. In this paper, the flag-in-wind problem is simulated by a fluid-structure interaction finite element analysis, where the Navier-Stokes equations based on the ALE method is strongly coupled with the Lagrangian equilibrium equations of the structure. In the simulation the three states are successfully reproduced, and the effects of some representative parameters on the amplitude and frequency of the oscillation are investigated to reveal the underlying mechanism of the flag flapping.
社団法人日本機械学会の論文
2005-01-25