JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
Other TitleTopological Structure of Streamlines and Tensor Invariants in Bubble-Type Vortex Breakdown
Author(jpn)山田, 健翔; 鈴木, 宏二郎
Author(eng)Yamada, Kento; Suzuki, Kojiro
Author Affiliation(jpn)東京大学; 東京大学
Author Affiliation(eng)The University of Tokyo; The University of Tokyo
Issue Date2019-02-25
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料: 第50回流体力学講演会/第36回航空宇宙数値シミュレーション技術シンポジウム論文集
JAXA Special Publication: Proceedings of the 50th Fluid Dynamics Conference / the 36th Aerospace Numerical Simulation Symposium
Start page199
End page203
Publication date2019-02-25
AbstractA bubble-type vortex breakdown is known as a topological change of streamlines. Topological approaches from the aspect of the dynamical system theory are promising to elucidate the fundamental structure of the vortex breakdown and classify the geometrical features into various classes. In this paper, in order to clarify a relation between a bifurcation process of the topology of streamlines and tensor invariants of the velocity gradient tensor, a bubble-type vortex breakdown was numerically simulated and the invariants of the velocity gradient tensor were examined. Our result showed that the structure of a longitudinal vortex was highlighted by the negative discriminant of the velocity gradient tensor and a minimum velocity inside the bubble-type vortex breakdown was on a surface where its determinant was zero.
Description会議情報: 第50回流体力学講演会/第36回航空宇宙数値シミュレーション技術シンポジウム (2018年7月4日-6日. 宮崎市民プラザ), 宮崎市, 宮崎
形態: カラー図版あり
Meeting Information: 50th Fluid Dynamics Conference /the 36th Aerospace Numerical Simulation Symposium (July 4-6, 2018. Miyazaki Citizen's Plaza), Miyazaki, Japan
Physical characteristics: Original contains color illustrations
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryFluid Mechanics and Thermodynamics
Report NoJAXA-SP-18-005

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