円柱渦形成域の流れ構造　ＬＤＶ計測とＦＦＴスペクトル法による可視化

DOI Web Site Web Site 被引用文献5件 参考文献12件

書誌事項

タイトル別名
  • Flow Structure in the Vortex-Formation Region behind a Circular Cylinder. LDV Measurement and Flow Visualization by an FFT-Spectrum Method.
  • エンチュウ ウズ ケイセイイキ ノ ナガレ コウゾウ LDV ケイソク ト F

この論文をさがす

抄録

The simple mechanism of the vortex formation behind a circular cylinder is visualized using two LDVs and FFT-spectrum method. The present method can more easily eliminate the FM-AM modulations of the fluctuating velocities than the phase-average method. These distribution based on the mean and fluctuating velocity components clearly indicate a simple mechanism of vortex formation in a cycle. Namely, in the mean flow, the stationary symmetric twin vortices exist in the dead water region as well as in the stationary thin vortex layers along the upper and the lower separated shear layers. In the periodically fluctuating flow, however, an unsteady vortex whose center is on the x-axis is generated just behind the cylinder and moves within the wake. Therefore, a large vortex forms asymmetrically in the dead water region, as the stationary thin vortex layers and the unsteady vortex interact, affecting one another's vorticity and kinetic energy.

収録刊行物

被引用文献 (5)*注記

もっと見る

参考文献 (12)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ