並列タイトル等Visualization of the Computed Unsteady Flow in Three Dimensions
タイトル（掲載誌）航空宇宙技術研究所特別資料 = Special Publication of National Aerospace Laboratory SP-9
一般注記Three-dimensional unsteady flow of the viscous incompressible fluid is calculated by using a finite-difference method and visualized by a graphic workstation. A grid system around an automobile has a multi-grid structure and is generated by a trans-finite-inter-polation method. The number of grid points is 112 by 73 by 56 and the Reynolds number based on the length of the automobile is 5,000,000. The calculation of a flow field is done on Fujitsu VP200 and its computational time is about 20 hours. Computed flow fields of 200 time steps are stored in magnetic tapes. Using them, streak-lines are calculated on a mini-supercomputer C-1 and even then visualized on a graphic workstation IRIS 4D. A motion film is taken the screen of IRIS 4D frame by flame using a computer-controlled VTR system. A longitudinal vortex on the side-window is almost steady. However, the other vortices, such as a horse-shoe vortex in front of the front windshield and vortices on the rear-window, show periodical changes and are shed one by one. It is found that a motion film makes the unsteady three-dimensional flow understandable and inevitable. Also, the amount of the data of the three-dimensional unsteady calculation is so huge that adequate shortening of data is necessary.
資料番号: NALSP0009010
レポート番号: NAL SP-9
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