• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2004 Fiscal Year Final Research Report Summary

The Dynamics of Bursting Process and Secondary Currents in River Turbulence'

Research Project

Project/Area Number 15560445
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionKumamoto University

Principal Investigator

OHMOTO Terunori  Kumamoto Univ., Dep.of Civil and Environmental Eng., Professor, 工学部, 教授 (30150494)

Project Period (FY) 2003 – 2004
KeywordsRiver Turbulence / Coherent Vortices / Identification methods / Direct Numerical Simulation / Secondary Currents / Sand wave / Dune / Sand ribbons
Research Abstract

Understanding complicated physical phenomena is a major theme of computational physics. Especially, turbulent flows are one of the most interesting subjects, and have been studied energetically by many researchers and engineers. In the background of the situation is the finding that turbulence, although of a random nature, has a coherent structure, and can be estimated deterministically by a Navier-Stokes equation. Approaches based on computational fluid dynamics have already increased the understanding of turbulent flows. In particular, a method called DNS plays a greater role owing to its high accuracy. Since it is based only on physical laws without a turbulence model, DNS is expected to be universally applicable to any flow field. DNS such as the spectral method, however, is not applicable to complex boundary flows while the applicability is required from an engineering viewpoint. DNS methods using a finite difierence method have recently been increasing due to their expasibility t … More o more comptex systems. Analyses have, however, still been made only of simplified turbulence fields including channel flows. Few reports are available on general flow fields with a curvilinear boundary(Krettenauer et al.,1992, De Angelis et al.,1997, Mito et al., 1998,Ohta et al.,1998).
Technological development for flow visualization, in the meantime, has revealed the existence of a coherent structure of relatively long life in turbulent flows of a complex time-space structure(Kline et al.,1967), and has also been demonstrating that the coherent structure is closely related to the transport of turbulent flows involving the generation, mixing and diffusion of turbulence. The coherent structure forms a slender cylindrical high-vorticity area surrounded by spiral flows, and is called cylindrical spiral vortex(low-pressure vortex). It plays a important role in generating streaks and Reynolds shear stress near the wall, and is thus regarded as a basic structure that expresses the turbulence structure. Much, however, needs to be clarified including the relationship to the secondary currents of Prandtl's second kind. Expectations are, therefore, placed on future development in particle-image velocimetry(PIV). Understanding the turbulence structure requires not only the data on the time-average and instantaneous fields but also information on ever-changing time development of the flow field. At present, therefore, numerical analyses including DNS are considered highly effective methods. Less

  • Research Products

    (18 results)

All 2005 2004 2003

All Journal Article (18 results)

  • [Journal Article] 相対粗度の大きい開水路流れの乱流特性について2005

    • Author(s)
      大本照憲, 柿原ゆり, 崔志英
    • Journal Title

      水工学論文集 Vol.49(掲載決定)

      Pages: 499-504

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 植生群落を伴う開水路流れにおける水面変動と流速変動の相互作用2005

    • Author(s)
      大本照憲, 田中貴幸, 矢北孝一
    • Journal Title

      水工学論文集 Vol.49(掲載決定)

      Pages: 511-516

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Interaction between Free Surface Oscillation and Velocity Fluctuations in an Open Channel Flow with Vegetation Zone2005

    • Author(s)
      Terunori OHMOTO, Takayuki TANAKA, Koichi YAKITA
    • Journal Title

      Annual Journal of Hydraulic Engineering(JSCE) Vol.49

      Pages: 499-504

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Turbulent Characteristics of Shallow Flow over Rough Surface with Regular Arrayed Spheres2005

    • Author(s)
      Terunori OHMOTO, Yuri KAKIHARA, Zhiying CUI
    • Journal Title

      Annual Journal of Hydraulic Engineering(JSCE) Vol.49

      Pages: 511-516

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Study on Coherent Vortex Structures over Dune Type Wavy Bed in an Open-Channel flow2004

    • Author(s)
      S.Hayashi, T.Ohmoto, R.Hirakawa
    • Journal Title

      IAHR Congress Proceedings of 5th International Symposium on Ecohydraulics, Aquatic Habitats : Analysis & Restoration Vol.1

      Pages: 496-500

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] FLOW STRUCTURES OVER STEPPED STEEP OPEN-CHANNEL2004

    • Author(s)
      Terunori Ohmoto, Kousuke Nagaya, Norimitsu Nariai
    • Journal Title

      IAHR Congress Proceedings of 5th International Symposium on Ecohydraulics, Aquatic Habitats : Analysis & Restoration Vol.1

      Pages: 489-495

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of Water Surface Oscillation on Flow Characteristics in Open Channel with a series of Spur Dikes2004

    • Author(s)
      T.OHMOTO, R.HIRAKAWA
    • Journal Title

      IAHR Congress Proceedings of 5th International Symposium on Ecohydraulics, Aquatic Habitats : Analysis & Restoration Vol.1

      Pages: 338-343

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高濃度土砂流の抵抗性について2004

    • Author(s)
      大本照憲, 崔志英, 柿原ゆり
    • Journal Title

      応用力学論文集 Vol.7

      Pages: 943-950

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Study on generation mechanism of inner secondary flow in a corner formed by a vertical wall and a free surface2004

    • Author(s)
      Syunichiro HAYASHI, Itsuro HOND, Terunori OHMOTO
    • Journal Title

      Annual Journal of Hydraulic Engineering(JSCE) Vol.48

      Pages: 655-660

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Study on Coherent Vortex Structures over Dune Type Wavy Bed in an Open-Channel flow by DNS2004

    • Author(s)
      Syunichiro HAYASHI, Terunori OHMOTO, Ryuichi HIRAKAWA
    • Journal Title

      IAHR Congress Proceedings of 5th International Symposium on Ecohydraulics, Aquatic Habitats, Analysis & Restoration, Madrid, Spain Vol.1

      Pages: 496-500

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of Water Surface Oscillation on Flow Characteristics in Open Channel with series of Spur Dikes2004

    • Author(s)
      Terunori OHMOTO, Ryuichi HIRAKAWA
    • Journal Title

      IAHR Congress Proceedings of 5th International Symposium on Ecohydraulics, Aquatic Habitats : Analysis & Restoration, Madrid, Spain Vol.1

      Pages: 338-343

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] On Rheology of Hyperconcentrated Sediment Laden Flow2004

    • Author(s)
      Terunori OHMOTO, Zhiying CUI, Yuri KAKIHARA
    • Journal Title

      Journal of Applied Mechanics(JSCE) Vol7

      Pages: 979-986

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] DIRECT NUMERICAL SIMULATION OF COHERENT VORTEX STRUCTURES IN AN OPEN-CHANNEL FLOW OVER DUNE TYPE WAVY BED2003

    • Author(s)
      Shunichiro Hayashi, Terunori Ohmoto, Kiyoshi Takikawa
    • Journal Title

      Journal of Hydroscience and Hydraulic Engineering(JSCE) Vol.21,No.1

      Pages: 1-10

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] STUDY ON GENERATION MECHANISM OF SECONDARY CURRENTS IN OPEN-CHANNEL FLOW BY DIRECT NUMERICAL SIMULATION2003

    • Author(s)
      Terunori Ohmoto, Syimichiro Hayashi
    • Journal Title

      Journal of Hydroscience and Hydraulic Engineering(JSCE) Vol.21,No.1

      Pages: 11-21

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Free-Surface Oscillation in an Open Channel with a Series of Spur Dikes2003

    • Author(s)
      Terunori OHMOTO, Ryuichi HIRAKAWA
    • Journal Title

      International Symposium on Shallow Flows, Delft University of Technology, The Netherlands, Part III

      Pages: 199-204

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] COHERENT VORTEX STRUCTURES OVER SAND RIDGES IN A FULLY DEVELOPED TURBULENT FLOW2003

    • Author(s)
      SHUN-ICHIRO HAYASHI, TERUNORI OHMOTO
    • Journal Title

      Proceedings of the 30th Congress of the International Association for Hydraulic Research, Thessaloniki, Greece, Theme C Inland Water Vol.I

      Pages: 89-96

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] EFFECTS OF WATER SURFACE OSCILLATION ON FLOW CHARACTERISTICS IN OPEN CHANNEL WITH SPUR DIKES2003

    • Author(s)
      TERUNORI OHMOTO, RYUICHI HIRAKAWA
    • Journal Title

      Proceedings of the 30th Congress of the International Association for Hydraulic Research, Thessaloniki, Greece, Theme C Inland Water Vol.II

      Pages: 401-408

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Study on coherent structures in a rectangular open channel flow by direct numerical simulation2003

    • Author(s)
      Syunichiro HAYASHI, Terunori OHMOTO, Itsuro HOND
    • Journal Title

      Journal of Applied Mechanics(JSCE) Vol.6

      Pages: 827-838

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2006-07-11  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi