Numerical Simulation of A Complicated Transition-Breakdown of Vortical Flows inside a Circular Pipe

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概要

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• Entrance flows to a circular pipe which has an axisymmetric sudden expansion were numerically simulated for a wide range of Reynolds numbers. Particularly shear layer instabilities observed behind the sudden expansion were studied. Experimental observation of the flow fields at the corresponding flow conditions were also carried out. Taylor-Helmholtz type instability was observed along the shear layer behind the sudden expansion, and its breakdown into turbulent blobs were observed. Numerical results successfully simulated this vortex breakdown process. The process that flows grow into chaos were also successfully simulated.

• 宇宙航空研究開発機構の論文

著者

• CHEN H.

  Department of Electrical Engineering, University of Maryland Baltimore County

• Oshima K

  Inst. Space And Astronautical Science

• Chen H

  Department Of Aeronautical Engineering University Of Tokyo

• OSHIMA K.

  The Institute of Space and Astronautical Science

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