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Jet and vortex flows in a shock/ hemispherical-bubble-on-wall configuration

Published online by Cambridge University Press:  03 March 2004

GAOZHU PENG ,
NORMAN J. ZABUSKY  and
SHUANG ZHANG
GAOZHU PENG
Affiliation:
Laboratory for Visiometrics and Modeling, Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey
NORMAN J. ZABUSKY
Affiliation:
Laboratory for Visiometrics and Modeling, Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey
SHUANG ZHANG
Affiliation:
Laboratory for Visiometrics and Modeling, Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey
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Abstract

We suggest an easily obtained laboratory configuration to observe jet and vortex flows for the Richtmyer–Meshkov (accelerated inhomogeneous flow) environment. A hemispherical bubble in air with density ratio of 5 is placed against an ideally reflecting wall and struck by a planar shock. This also models a spherical bubble struck symmetrically by two identical approaching shocks, that is, a “reshock” configuration. For all Mach numbers (M = 1.2, 1.5, and 2.0), our axisymmetric simulations show that the heavy hemispherical bubble expands axially away from the wall as a jet, and a weaker vortex ring moves radially along the wall. In addition, when M = 1.5, a ringlike vortex projectile (VP) of small diameter follows closely behind the reflected shock and is associated with its moving triple point. This VP contains an entrained shocklet and quadrupole structure of dilatation. Various methods are applied to quantify the emerging coherent structures.

Keywords

Accelerated inhomogeneous flowJetReshockRichtmyer–Meshkov instabilityVortex projectileVortex ring
Type
Research Article
Information
Laser and Particle Beams , Volume 21 , Issue 3 , July 2003 , pp. 449 - 453
Copyright
© 2003 Cambridge University Press

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References

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