Dissimilar scalar dissipation structures in stratified turbulence with differential diffusion of heat and salinity

• Project/Area Number: 19360084
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Kyoto University
• Principal Investigator: HANAZAKI Hideshi Kyoto University, 工学研究科, 准教授 (60189579)
• Co-Investigator(Kenkyū-buntansha): MIYAZAKI Takeshi 電気通信大学, 大学院・電気通信学研究科, 教授 (50142097)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥19,890,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥4,590,000); Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2008: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000); Fiscal Year 2007: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
• Keywords: 成層流体 / 乱流熱物質輸送

Research Abstract

The origin of dissimilarity between scalar and velocity spectra in stratified turbulence has been investigated by direct numerical simulation, stratified tank experiments and rapid distortion theory when there is a passive scalar or when there are two active scalars. The results show that when the Ozmidov scale is smaller than the Kolmogorov scale, variance of the active scalar dissipates near the Kolmogorov scale.

Research Products

• [Journal Article] Double-period oscillation of passive scalar flux in stratified turbulence. (2009)
  • Author(s): H. Hanazaki, T. Miyao, T. Okamura
  • Journal Title: Advances in Turbulence vol.12 Pages: 447-448
  • Peer Reviewed
• [Journal Article] Schmidt number effects on the flow past a sphere moving vertically in a stratified diffusive fluid (2009)
  • Author(s): H.Hanazaki, K.Konishi, T.Okamura
  • Journal Title: Physics of Fluids 21
  • Peer Reviewed
• [Journal Article] Jets generated by a sphere moving vertically in a stratified fluid (2009)
  • Author(s): H.Hanazaki, K.Kashimoto, T.Okamura
  • Journal Title: Journal of Fluid Mechanics 638 Pages: 173-197
  • Peer Reviewed
• [Journal Article] Double-period oscillation of passive scalar flux in stratified turbulence (2009)
  • Author(s): H.Hanazaki, T.Miyao, T.Okamura
  • Journal Title: Advances in Turbulence 12 Pages: 447-448
  • Peer Reviewed
• [Journal Article] Schmidt number effects on the flow past a sphere moving vertically in a stratified diffusive fluid. (2009)
  • Author(s): H. Hanazaki, K. Konishi, T. Okamura
  • Journal Title: Physics of Fluids 21 Pages: 26602-26602
  • Peer Reviewed
• [Journal Article] Slowly oscillating modes in the passive scalar diffusion in stratified turbulence. (2008)
  • Author(s): H. Hanazaki
  • Journal Title: Physics of Fluids vol.20 Pages: 55106-55106
  • Peer Reviewed
• [Journal Article] Effects of the slow modes in the differential diffusion in stratified sheared turbulence. (2008)
  • Author(s): H. Hanazaki
  • Journal Title: Proc. IUTAM Symposium on Computational Physics and New Perspectives in Turbulence Pages: 397-401
  • Peer Reviewed
• [Journal Article] Slowly oscillating modes in the passive scalar diffusion in stratified turbulence. (2008)
  • Author(s): H. Hanazaki
  • Journal Title: Physics of Fluids 20 Pages: 55106-55106
  • Peer Reviewed
• [Journal Article] Slowly oscillating modes in the passive scalar diffusion in stratified turbulence (2008)
  • Author(s): H. Hanazaki
  • Journal Title: Physics of Fluids 20(印刷中)
  • Peer Reviewed
• [Journal Article] Differential diffusion in double-diffusive stratified turbulence (2007)
  • Author(s): H. Hanazaki & K. Konishi
  • Journal Title: Advances in Turbulence 11 Pages: 615-617
  • Peer Reviewed
• [Presentation] Slow oscillation of passive scalar fluxes in stratified turbulence. (2009)
  • Author(s): H. Hanazaki, T. Okamura
  • Organizer: 62th Annual Meeting of the American Physical Society Division of Fluid Dynamics
  • Place of Presentation: ミネアポリス, アメリカ合衆国
  • Year and Date: 2009-11-22
• [Presentation] Slow oscillation of passive scalar fluxes in stratified turbulence (2009)
  • Author(s): H.Hanazaki, T.Okamura
  • Organizer: 62^<th> Annual Meeting of the American Physical Society Division of Fluid Dynamics
  • Place of Presentation: ミネアポリス、アメリカ合衆国
  • Year and Date: 2009-11-22
• [Presentation] 成層流体中のジェットと波動・乱流 (2009)
  • Author(s): 花崎秀史
  • Organizer: 西日本乱流研究会 第26回シンポジウム
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2009-08-25
• [Presentation] Differential diffusion of high Prandtl number scalars in stratified turbulence. (2008)
  • Author(s): H. Hanazaki, T. Miyao
  • Organizer: 61th Annual Meeting of the American Physical Society Division of Fluid Dynamics
  • Place of Presentation: San Antonio, USA
  • Year and Date: 2008-11-25
• [Presentation] Absence of small-scale fluctuations of high-Prandtl number buoyant scalars in stratified turbulence. (2008)
  • Author(s): H. Hanazaki, K. Konishi, T. Miyao
  • Organizer: 7th EUROMECH Fluid Mechanics Conference
  • Place of Presentation: Manchester, UK
  • Year and Date: 2008-09-15
• [Presentation] Absence of small-scale fluctuations of high-Prandtl number scalars in stratified turbulence. (2008)
  • Author(s): H. Hanazaki, K. Konishi, T. Miyao
  • Organizer: 22nd International Congress of Theoretical and Applied Mechanics
  • Place of Presentation: Adelaide, Australia
  • Year and Date: 2008-08-26
• [Presentation] Absence of small-scale fluctuations of high-Pr buoyant scalars in stratified turbulence. (2007)
  • Author(s): H. Hanazaki and T. Miyao
  • Organizer: 60th Annual Meeting of the American Physical Society Division of Fluid Dynamics
  • Place of Presentation: Salt Lake City, USA
  • Year and Date: 2007-11-21
• [Presentation] 二重拡散の成層乱流におけるアクティブスカラーとパッシブスカラー拡散の相違 (2007)
  • Author(s): 宮尾武寛、花崎秀史
  • Organizer: 第85期日本機械学会流体工学部門講演会
  • Place of Presentation: 東広島市
  • Year and Date: 2007-11-19
• [Presentation] Differential diffusion in double-diffusive stratified turbulence. (2007)
  • Author(s): H. Hanazaki, K. Konishi
  • Organizer: The 11th European Turbulence Conference
  • Place of Presentation: Porto, Portugal
  • Year and Date: 2007-06-25
• [Presentation] Differential diffusion in double-diffusive stratified turbulence (2007)
  • Author(s): H. Hanazaki & K. Konishi
  • Organizer: The 11th European Turbulence Conference
  • Place of Presentation: Porto, Portugal
  • Year and Date: 2007-06-25