並列タイトル等低プラントル流体のハーフゾーン液柱における3次元振動の数値シミュレーション
タイトル(掲載誌)宇宙開発事業団技術報告: マランゴニ対流現象モデル研究:アニュアルレポート2002 = NASDA Technical Memorandum: Marangoni Convection Modeling Research: Annual Report April 1, 2002-March 31, 2003
一般注記In order to understand the realistic flow transitions in a small liquid bridge of molten tin with an aspect ratio of As = 2.0, which was used for experiments at NASDA, a long-run numerical simulation was conducted using real temperature history of the experiment for boundary conditions in the numerical code. The result revealed that the critical Marangoni numbers, flow mode and frequency of the 3-D flow of the present ramped Delta-T case are very close to those obtained in the previous works in which Delta-T was kept constant. However, the amplitude of surface temperature oscillations near the second critical point are very small (0.2 K) and its frequency is high (2.5 Hz in 1-T type oscillation). At highly super critical state, the 1-T type oscillatory flow-temperature structures started slow azimuthal motion. This rotation caused a low frequency oscillation of a local surface temperature. At further large Delta-T, there occurred an alternative changes of oscillation mode between 1-T and 2-T, whereas the slow rotation action was maintained. These results seem to explain the experimental observations. Also conducted was a set of Proper Orthogonal Decomposition (POD) analyses for oscillatory flows in liquid bridges of low Pr fluid. POD helped understanding the detailed structures of the 3-D disturbances in a liquid bridge of Pr = 0.01 fluid simulated with a condition of As = 2.0 and Ma = 35.0.
資料番号: AA0046980005
レポート番号: NASDA-TMR-030004E
一次資料へのリンクURLhttps://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=42954&item_no=1&attribute_id=31&file_no=1
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ