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Shock interaction with a heavy gas cylinder: Emergence of vortex bilayers and vortex-accelerated baroclinic circulation generation

Published online by Cambridge University Press:  03 March 2004

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

We present a numerical study to late times of a Richtmyer–Meshkov environment: a weak shock (M = 1.095) interacting with a heavy cylindrical bubble. The bubble interface is modeled as a diffuse interfacial transition layer (ITL) with finite thickness. Our simulation with the piecewise parabolic method (PPM) yields very good agreement in large- and intermediate-scale features with Jacobs' experiment (Jacobs, 1993). We note the primary circulation enhancement deposited baroclinically upon the incident shock wave, and significant secondary baroclinic circulation enhancement, first observed in Zabusky and Zhang (2002). We propose that this vortex-accelerated circulation deposition is universal. These baroclinic processes are mediated by a strong gradient intensification and stretching of the ITL and result in close-lying vortex bilayers (VBLs) and the emergence of vortex projectiles (VPs). These account for the elongated, kidney-shaped morphology of the rolled up bubble domain at late times.

Keywords

Richtmyer–Meshkov environmentVortex-accelerated circulation depositionVortex bilayersVortex projectiles
Type
Research Article
Information
Laser and Particle Beams , Volume 21 , Issue 3 , July 2003 , pp. 443 - 448
Copyright
© 2003 Cambridge University Press

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