Evolution of shock waves and the primary vortex loop discharged from a square cross-sectional tube |
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Authors: | Z Jiang O Onodera K Takayama |
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Institution: | (1) Shock Wave Research Center, Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan , JP |
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Abstract: | In this paper, a numerical and experimental investigation of the evolution of a transmitting shock wave and its associated
primary vortex loop, which are discharged from the open end of a square cross-sectional tube, is described. The experiments
were conducted in the square tube connected to a diaphragmless shock tube and the flowfield was visualized from the axial
direction with diffusive holographic interferometry. The numerical simulations were carried out by solving the three-dimensional
Euler equations with a dispersion-controlled scheme. The numerical results were displayed in the form of interferograms to
compare them with experimental interferograms. Good agreement between the numerical and experimental results was obtained.
More detailed numerical calculations were carried out, from which the three-dimensional transition of the shock wave configuration
from an initial planar to a spherical shape and the development of the primary vortex loop from a square shaped to a three-dimensional
structure were clearly observed and interpreted.
Received 29 January 1998 / Accepted 22 May 1998 |
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Keywords: | :Numerical simulations Holographic interferometry Shock tube Numerical flow visualization Shock waves Vortex loop |
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