Laboratory astrophysics: 2D and 3D numerical modeling of jets and flows produced in wire array experiments

Details Laboratory astrophysics: 2D and 3D numerical modeling of jets and flows produced in wire array experiments Laboratory astrophysics: 2D and 3D numerical modeling of jets and flows produced in wire array experiments

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703..447c&link_type=abstract

PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 447

Astronomy and Astrophysics

Astrophysics

4

Plasma Dynamics And Flow, Wire Array Z-Pinches, Plasma Simulation, Magnetohydrodynamics And Plasmas

Scientific paper

Numerical modeling of jets formed in conical wire array Z-pinch experiments shows that scaled, astrophysically relevant flows can be obtained in the laboratory. These jets are hypersonic, with Mach number in excess of 20, are radiatively cooled and have a length to width ratio of ~ 1:10. Furthermore the jet formation mechanism is due to the hydrodynamic confinement of a standing conical shock, which redirects and collimates the converging plasma flow. The jets produced are also characterized by large Reynolds and Peclet numbers. Jet-wind interactions are modeled assuming a supersonically expanding radiatively ablated plasma wind. The jet bends away from the wind and it remains well collimated during and after the interaction, with the bending determined by the ram pressure of the impinging wind. A further development in wire array laboratory astrophysics experiments is the use of radial arrays, where the interaction of a ``freely'' expanding toroidal-like plasma cloud produces an axial collimated flow; subsequently a strong shock drives a supersonic, high density radiatively cooled ``bullet'' through this background medium.

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