| 発表年月日 | 1999/12/21 |
|---|---|
| 発表テーマ | 回転円筒内の軸対称な渦崩壊のよどみ点位置につ いて |
| 会議名 | 第13回数値流体シンポジウム |
| 主催者 | 日本流体力学会 |
| 開催地名 | 東京 |
| 学会区分 | 全国学会 |
| 発表形式 | 口頭（一般） |
| 単独共同区分 | 共同 |
| 国名 | 日本 |
| 開催期間 | 1999/12/21 ～ 1999/12/23 |
| 発表者・共同発表者 | 岩津 玲磨, 児山 秀晴 |
| 概要 | Numerical study is conducted on the enclosed swirling flows within a cylindrical container. The swirling flows are driven by the top lid motion which rotates at a constant angular velocity. These flows are known to exhibit vortex breakdown process for limited ranges of two primary parameters, i.e., the Reynolds number Re and the container aspect ratio h. Based on the wealth of numerical solutions, the distribution of swirl angle is plotted and compared with the experimental data. In accordance with the empirically known vortex breakdown condition, i.e., the swirl angle exceeds a certain critical value is necessary for the occurrence of breakdown, numerically obtained swirl angle always exceeds a certain value at the edge of vortex core and the agreement of this vale with the experimental data is quite good. Recently proposed criterion by Lopez is examined in detail and possible explanation for its validity is sought by evaluating the relative magnitude of the momentum equations. |