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Internal structure of a vortex breakdownAn axisymmetric vortex breakdown was well simulated by the vortex filament method. The agreement with the experiment was qualitatively good. In particular, the structure in the interior of the vortex breakdown was ensured to a great degree by the present simulation. The second breakdown, or spiral type, which occurs downstream of the first axisymmetric breakdown, was simulated more similarly to the experiment than before. It shows a kink of the vortex filaments and strong three-dimensionality. Furthermore, a relatively low velocity region was observed near the second breakdown. It was also found that it takes some time for this physical phenomenon to attain its final stage. The comparison with the experiment is getting better as time goes on. In this paper, emphasis is placed on the comparison of the simulated results with the experiment. The present results help to make clear the mechanism of a vortex breakdown.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Nakamura, Y.
(Nagoya University Japan)
Leonard, A.
(California Institute of Technology Pasadena, United States)
Spalart, P. R.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1986
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 86-1074
Accession Number
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