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1998 Fiscal Year Final Research Report Summary

Vortical structure and turbulence control in rotating fluids

Research Project

Project/Area Number 08650080
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Engineering fundamentals
Research InstitutionOkayama University

Principal Investigator

YANASE Shinichiro  Okayama University, Faculty of Engineering, Professor, 工学部, 教授 (20135958)

Co-Investigator(Kenkyū-buntansha) TAKAMI Toshihiro  Okayama University of Science, Faculty of Engineering, Professor, 工学部, 教授 (40144886)
Project Period (FY) 1996 – 1998
Keywordsturbulence / control / uniform rotation / Coriolis force / vortical structure / cyclonic vortex / vortex layer / shear flow
Research Abstract

First the results obtained by the head investigator are described. Three papers have been published. Two of them are on the bifurcation phenomena in the flow through a curved duct, where the competitive effect of the Coriolis force and the centrifugal force associated with the duct curvature is studied. It is found that when these effect are balanced, the flow flux is maximum. The other is on the vortical structure in the rotating fluids. In DNS without mean shear flow, it is found that the resonant interaction plays an important role in the two-dimensionalization process of turbulence. In the simulations with mean shear flow, it is found that a coherent structure develops when the background absolute vorticity is zero. Next the results obtained by the sub-investigator are described, By the experimental investigation of turbulent curved pipe flow, it is found that the injection of swirling flow at the inlet of the pipe reduces the drag appreciably, which will contribute industrial application.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K.Yamamoto, S.Yanase, M.M.Alan: "Axially invariant laminar flow in a helical duct of square cross-section" Indian J.pure appl.Math.Vol.30(3). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yamamoto, S.Yanase, M.M.Alan: "Flow through a rotating curved duct with square cross-section" J.Phys.Soc.Japan. Vol.68(4). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tanaka, S.Yanase, S.Kida, G.Kawahara: "Vortical structures in rotating uniformly sheared turbulence" Flow, Turbulence and Combustion. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tanaka, S.Yanase, S.Kida, G.Kawahara: "Uniformly sheared turbulent flow under the effect of solid-body rotation" Proc.11th Symp.on Turbulent Shear Flow, Grexoble, France. Vol.1. 1・7-12 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takami, S.Yanase, T.Maruyama, K.Araki: "Drag reduction of turbulent flows in a curved pipe due to the swirling instability" The 4th KSME-JSME Fluid Engineering Conference Proceedings. No.0920. 665-668 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yamamoto, S.Yanase & M.M.Alam: "Axially invariant laminar flow in a helical duct of square cross-section" Indian J.pure appl.Math.30 (3). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Yamamoto, S.Yanase & M.M.Alam: "Flow through a rotating curved duct with square cross-section" J.Phys.Soc.Japan. 68 (4). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tanaka, S.Yanase, S.Kida & G.Kawahara: "Vortical structures in rotating uniformly sheared turbulence" Flow, Turbulence and Combustion. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tanaka, S.Yanase, S.Kida & G.Kawahara: "Uniformly sheared turbulent flow under the effect of solid-body rotation" Proc.11^<th> Symp.On Turbulent Shear Flow, Grenoble, France. Vol.1. 1.7-12 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Takami, S.Yanase, Y.Maruyama & K.Araki: "Drag reduction of turbulent flows in a curved pipe due to the swirling instability" The 4^<th> KSME-JSME Fluid Engineering Conference Proceedings. No.0920. 665-668 (1998)

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

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Published: 1999-12-08  

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