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development of numerical analysis for monitoring transition process of vortices and prediction of vortex generation

Research Project

Project/Area Number 16K06094
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Fluid engineering
Research InstitutionAichi Institute of Technology

Principal Investigator

NAKAYAMA Katsuyuki  愛知工業大学, 工学部, 准教授 (50440631)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords渦発生 / 渦遷移 / swirlity / 予測旋回平面 / 渦発生キーフロー / 渦 / トポロジー / 渦予測 / スケール分解 / 旋回平面予測 / 階層構造 / 旋回平面 / 流体工学 / 数値解析
Outline of Final Research Achievements

A numerical analysis technique has been developed to monitor the transition process of a vortex and its prediction in terms of the local topology, applying a topological physical quantity swirlity that specifies the unidirectionality and intensity of azimuthal flow. The swirlity specifies the process of vortex generation and then the swirl plane after the vortex generation can be predicted. The key flow as a trigger of the generation of a vortical flow is identified which direction is associated to the predicted swirl plane. In the flow decomposition of the subjected turbulent flow, the flow scale that composes the key flow can also be identified. In the analysis of the prediction of vortex generation using the swirlity, the feature of transition of predicted key flow may be applied to predict the generation at a specific time.

Academic Significance and Societal Importance of the Research Achievements

渦の発生は、宇宙、気象、海洋における渦だけでなく、航空機、発電プラント、構造物まで多様な工学に関わる。渦の統一的な定義は未確立であるが、主要な渦定義や渦の同定に用いられる定義は、速度勾配テンソルより導かれるローカルトポロジーに基づく定義である。本研究は、このローカルトポロジーにおける渦の遷移メカニズム、渦発生のキーフローの同定、swirlityやキーフローを用いた渦発生予測の評価、更にキーフロー生成の流れのスケールの同定を行う数値解析技術を構築した。本研究は、前述した様々なスケールの乱流渦現象や工学分野の流れにおいて適用が可能である。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report

Research Products

(15 results)

All 2019 2018 2017 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (14 results) (of which Int'l Joint Research: 14 results)

  • [Journal Article] A numerical analysis for identification of flow transition in vortex generation in terms of local flow topology2017

    • Author(s)
      Katsuyuki Nakayama and Lucas Dias Mizushima
    • Journal Title

      JFST

      Volume: 12 (No. 3) Issue: 3 Pages: JFST0027-JFST0027

    • DOI

      10.1299/jfst.2017jfst0027

    • NAID

      130006308073

    • ISSN
      1880-5558
    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Spectrum of Key Flow for Vortex Birth2019

    • Author(s)
      K. Nakayama
    • Organizer
      IUTAM(International Union of Theoretical and Applied Mathematics) symposium on Vortex dynamics in science, nature and technology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] An analysis of significant flow scale of key flow for vortex generation in terms of local flow geometry in isotropic homogeneous turbulence2018

    • Author(s)
      K. Nakayama
    • Organizer
      71st Annual Meeting of the American Physical Society's Division of Fluid Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Geometrical Characteristic of a Vortex Birth in Terms of Local Flow Geometry in Isotropic Homogeneous Turbulence2018

    • Author(s)
      D. Aoyama and K. Nakayama
    • Organizer
      71st Annual Meeting of the American Physical Society's Division of Fluid Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A key flow and its flow scale for vortex birth in isotropic homogeneous turbulence2018

    • Author(s)
      K. Nakayama and D. Aoyama
    • Organizer
      Fifteenth International Conference on Flow Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Feasibility Study of Vortex Forecast with Invariant Key Flow of Vortex Generation in Isotropic Homogeneous Turbulence2018

    • Author(s)
      Y. Fukatsu and K. Nakayama
    • Organizer
      Fifteenth International Conference on Flow Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological Characteristics of Vortex Transition in Isotropic Homogeneous Turbulence2018

    • Author(s)
      D. Aoyama and K. Nakayama
    • Organizer
      Fifteenth International Conference on Flow Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relationships of Vortex Generation in Multi-scale Flows in Isotropic Homogeneous Turbulence2018

    • Author(s)
      R. Saeki and K. Nakayama
    • Organizer
      Fifteenth International Conference on Flow Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A mechanism of flow transition into a vortex in isotropic homogeneous turbulence2018

    • Author(s)
      K. Nakayama
    • Organizer
      Fourth International Retreat Vortical Flow and Aerodynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A numerical analysis for specifying key flow and its flow scale for vortex generation2018

    • Author(s)
      K. Nakayama
    • Organizer
      Sixteenth International Conference of Numerical Analysis and Applied Mathematics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Identification of key flow for vortex generation in terms of local flow geometry2017

    • Author(s)
      Katsuyuki Nakayama
    • Organizer
      The 70th Annual Meeting of the American Physical Society Division of Fluid Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Topological Effect in Vortex Transition in an Isotropic Homogeneous Turbulence2017

    • Author(s)
      Katsuyuki Nakayama
    • Organizer
      Fourteenth International Conference on Flow Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effect of Vortex Stretching in Flow Transition into Vortical Flow2017

    • Author(s)
      Daiki Aoyama and Katsuyuki Nakayama
    • Organizer
      Fourteenth International Conference on Flow Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Invariant feature of swirlity and trigger flow in vortex generation in terms of local flow geometry in isotropic homogeneous turbulence2017

    • Author(s)
      Katsuyuki Nakayama
    • Organizer
      International Union of Theoretical and Applied Mechanics (IUTAM) Symposium on Dynamics and Topology of Vorticity and Vortices
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Analysis of Generation Process of a Vortex in terms of Local Flow Topology2016

    • Author(s)
      Katsuyuki Nakayama, Lucas Dias Mizushima
    • Organizer
      13th International Conference on Fluid Dynamics (ICFD 2016)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2016-10-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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