Investigation of the vertical flow and vertical Lagrangian dispersion in a stratified fluid

• Project/Area Number: 24656124
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Kyoto University
• Principal Investigator: HANAZAKI HIDESHI 京都大学, 工学(系)研究科(研究院), 教授 (60189579)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 成層流体 / 粒子画像速度計測 / レーザー誘起蛍光法 / 鉛直運動 / ジェット

Outline of Final Research Achievements

Experiments and numerical simulations have been performed on the flow around a sphere moving vertically in a salt-stratified fluid. In the experiments, PIV(particle image velocimetry) and LIF(laser induced fluorescence) are used to measure the fluid velocity and the concentration of salt. The results show that the vertical dragging of fluid by the sphere and the resultant generation of a vertical jet are governed by the boundary layer of salt concentration on the sphere surface.

Research Products

• [Journal Article] Numerical simulation of capillary gravity waves excited by an obstacle in shallow water. (2015)
  • Author(s): Motonori Hirata, Shinya Okino, and Hideshi Hanazaki
  • Journal Title: Proceedings of the Estonian Academy of Sciences Volume: 64 Issue: 3 Pages: 278-284
  • DOI: 10.3176/proc.2015.3.11
  • Peer Reviewed / Open Access
• [Journal Article] Numerical simulation of jets generated by a sphere moving vertically in a stratified fluid (2015)
  • Author(s): H. Hanazaki, S. Nakamura & H. Yoshikawa
  • Journal Title: Journal of Fluid Mechanics Volume: 765 Pages: 424-451
  • DOI: 10.1017/jfm.2014.737
  • Peer Reviewed
• [Journal Article] 成層流体中を鉛直移動する球によるジェットの形成 (2014)
  • Author(s): 仲村将大、沖野真也、花崎秀史
  • Journal Title: 京都大学数理解析研究所講究録 「非線形波動現象の数理と応用」 Volume: 1890 Pages: 61-72
  • Open Access
• [Journal Article] 内部重力波と水面波が同時に励起される系の数値シミュレーション (2014)
  • Author(s): 菊池琢、沖野真也、花崎秀史
  • Journal Title: 京都大学数理解析研究所講究録 「非線形波動現象の数理と応用」 Volume: 1890 Pages: 50-60
  • Open Access
• [Journal Article] LIF measurements of the flow past a sphere descending in a stratified fluid. (2014)
  • Author(s): S. Akiyama, S. Okino & H. Hanazaki
  • Journal Title: Bulletin of the American Physical Society Volume: 59 Pages: 133-133
• [Journal Article] Jets generated by a sphere moving vertically in stratified fluids (2013)
  • Author(s): H. Hanazaki, S. Okino, S. Nakamura & S. Akiyama
  • Journal Title: Bulletin of the American Physical Society Volume: 58 Pages: 377-377
• [Journal Article] LIF Measurements of the flow around a sphere descending vertically in a stratified fluid (2013)
  • Author(s): S. Okino, S. Akiyama & H. Hanazaki
  • Journal Title: Proc. The 13th Tsinghua-Seoul-Kyoto Three Asian University Thermal Engineering Conference. Volume: 13 Pages: 1-1
• [Journal Article] Numerical simulation of jets generated by a sphere moving vertically in stratified fluids. (2012)
  • Author(s): H. Hanazaki & S. Nakamura
  • Journal Title: Bulletin of the American Physical Society Volume: 57(17) Pages: 144-144
• [Journal Article] Process of the jet formation by a sphere moving vertically in a stratified fluid. (2012)
  • Author(s): S. Nakamura & H. Hanazaki
  • Journal Title: Proc. of The 12th Seoul-Kyoto-Tsinghua Three Asian University Thermal Engineering Conference. Volume: 12 Pages: 61-64
• [Presentation] 強成層の流体中を鉛直移動する球まわりの流れ場 (2016)
  • Author(s): 和氣悠将、秋山真作、野口真之介、沖野真也、花崎秀史
  • Organizer: 第53回日本伝熱シンポジウム
  • Place of Presentation: 大阪国際会議場
  • Year and Date: 2016-05-24
• [Presentation] PIV measurements of the flow around a sphere descending in a salt stratified fluid. (2015)
  • Author(s): S. Akiyama, Y. Waki, S. Okino & H. Hanazaki
  • Organizer: The 15th Kyoto-Tsinghua-Seoul National University Thermal Engineering Conference
  • Place of Presentation: 京都大学
  • Year and Date: 2015-12-12
  • Int'l Joint Research
• [Presentation] Particle path analysis of the flow past a sphere moving vertically in a stratified fluid (2014)
  • Author(s): K. Arai, S. Okino & H. Hanazaki
  • Organizer: The 14th Seoul National-Kyoto-Tsinghua University Thermal Engineering Conference
  • Place of Presentation: Seoul, Korea
  • Year and Date: 2014-10-30 – 2014-11-01
• [Presentation] LIF measurements of the jet behind a sphere moving vertically in a stratified fluid (2014)
  • Author(s): S. Okino, S. Akiyama & H. Hanazaki
  • Organizer: 10th European Fluid Mechanics Conference
  • Place of Presentation: Lyngby, Denmark
  • Year and Date: 2014-09-14 – 2014-09-18
• [Presentation] Experimental and numerical investigation of the flow behind a sphere moving vertically in a stratified fluid (2014)
  • Author(s): S. Akiyama，S. Nakamura, S. Okino & H. Hanazaki
  • Organizer: The 15th International Heat Transfer Conference.
  • Place of Presentation: 京都
  • Year and Date: 2014-08-10 – 2014-08-15
• [Presentation] 成層流体中を鉛直移動する球によるジェットの形成 (2014)
  • Author(s): 仲村将大、花崎秀史、沖野真也
  • Organizer: 京都大学工学研究科高等研究院 流体基礎工学研究部門 第１回公開セミナー
  • Place of Presentation: 京都大学
• [Presentation] 成層流体中を鉛直移動する球まわりの密度境界層のLIFによる測定 (2013)
  • Author(s): 秋山 真作、鈴江 和昌、 沖野 真也、花崎 秀史
  • Organizer: 日本流体力学会年会2013
  • Place of Presentation: 東京農工大学
• [Presentation] 内部重力波と水面波が同時に励起される系の数値シミュレーション (2013)
  • Author(s): 菊池琢、沖野真也、花崎秀史
  • Organizer: 京都大学数理解析研究所共同研究集会「非線形波動現象の数理と応用」
  • Place of Presentation: 京都大学
• [Presentation] 成層流体中を鉛直移動する球によるジェットの形成 (2013)
  • Author(s): 仲村将大、沖野真也、花崎秀史
  • Organizer: 京都大学数理解析研究所共同研究集会「非線形波動現象の数理と応用」
  • Place of Presentation: 京都大学
• [Presentation] 成層流体中を鉛直移動する球まわりの密度場 (2013)
  • Author(s): 鈴江和昌、花崎秀史
  • Organizer: 京都大学工学研究科高等研究院 流体理工学研究部門 第5回公開セミナー
  • Place of Presentation: 京都大学
• [Presentation] 成層流体中を鉛直移動する球によるジェットの形成過程 (2012)
  • Author(s): 仲村将大，花崎秀史
  • Organizer: 日本流体力学会年会2012
  • Place of Presentation: 高知大学
• [Presentation] 成層流体中を鉛直移動する球まわりの密度分布 (2012)
  • Author(s): 鈴江和昌、花崎秀史
  • Organizer: 第９０期日本機械学会流体工学部門講演会
  • Place of Presentation: 同志社大学
• [Remarks] 京都大学 大学院工学研究科 機械理工学専攻 流体物理学研究室
  • URL: http://www.vortex.me.kyoto-u.ac.jp/index.html
• [Remarks] 京都大学工学研究科流体物理学研究室
  • URL: http://www.vortex.me.kyoto-u.ac.jp/
• [Remarks] 京都大学大学院工学研究科機械理工学専攻流体物理学研究室
  • URL: http://www.vortex.me.kyoto-u.ac.jp/