Conference Paper DNSによる高Mach数・低Reynolds数の球周りの流れ場に対するMach数や温度比の影響把握
Investigation of effect of Mach number and Temperature ratio into Flow Field around a Sphere at High Mach and Low Reynolds Numbers Condition by DNS

永田, 貴之  ,  野々村, 拓  ,  高橋, 俊  ,  水野, 裕介  ,  福田, 紘大  ,  Nagata, Takayuki  ,  Nonomura, Taku  ,  Takahashi, Shun  ,  Mizuno, Yusuke  ,  Fukuda, Kota

In this study, the direct numerical simulations of the flow around a sphere on the high Mach and low Reynolds numbers condition are carried out, and the flow properties are investigated. The three-dimensional compressible Navier-Stokes equations are solved on boundary fitted coordinate system. It is confirmed to have sufficient accuracy by the previous study. Analyses are performed at the Reynolds number (based on the diameter of the sphere and the free-stream velocity) of between 100 and 300, the free-stream Mach number of between 0.3 and 2.0, and the temperature ratio of the sphere surface and free-stream of between 0.5 and 2.0. As a result, we clarified the following points: 1) the effect of the free-stream Reynolds number and temperature ratio on the flow properties, 2) the effect of the temperature ratio can be summarized by the effective Reynolds number that is newly proposed parameter.
会議情報: 第47回流体力学講演会/第33回航空宇宙数値シミュレーション技術シンポジウム (2015年7月2日-3日. 東京大学生産技術研究所), 目黒区, 東京
形態: カラー図版あり
Meeting Information: 47th Fluid Dynamics Conference /the 33rd Aerospace Numerical Simulation Symposium (July 2-3, 2015. Institute of Industrial Science , the University of Tokyo), Meguro, Tokyo, Japan
Physical characteristics: Original contains color illustrations

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