Vorticity generation and evolution in shock-accelerated density-stratified interfaces
- Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey 08855 (United States)
- Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4801 (United States)
- Department of Mechanical and Aerospace Engineering, and CAIP Center, Rutgers University, Piscataway, New Jersey 08855 (United States)
- Department of Astronomy, University of Virginia, Charlottesville, Virginia 22903 (United States)
The results of direct numerical simulations of inviscid planar shock-accelerated density-stratified interfaces in two dimensions are presented and compared with shock tube experiments of Haas ((private communication, 1988)) and Sturtevant (in {ital Shock} {ital Tubes} {ital and} {ital Waves}, edited by H. Gronig (VCH, Berlin, 1987), p. 89) . Heavy-to-light ( slow/fast or s/f) and light-to-heavy ( fast/slow,'' or f/s) gas interfaces are examined and early-time impulsive vorticity deposition and the evolution of coherent vortex structures are emphasized and quantified. The present second-order Godunov scheme yields excellent agreement with shock-polar analyses at early time. A more physical vortex interpretation explains the commonly used (i.e., linear paradigm) designations of unstable'' and stable'' for the f/s and s/f interfaces, respectively. The later time events are Rayleigh--Taylor like and can be described in terms of the evolution of a vortex layer (large-scale translation and rotation): {ital asymmetric} tip vortex roll-up'' and binding;'' layer instability;'' convective mixing; and baroclinic vorticity generation from secondary shock--interface interactions.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7036147
- Journal Information:
- Physics of Fluids A; (United States), Vol. 4:7; ISSN 0899-8213
- Country of Publication:
- United States
- Language:
- English
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