The hydrodynamic processes resulting from 'instantaneous' heating of a cylindrical region of gas are studied by means of numerical integration of the fluid equations. Various initial overpressures and radial profiles of initial pressure are considered. For very smooth radial profiles, e.g. the Bennett profile, the evolution is very simple: the gas expands radially, a single outgoing shock forms, the density at late times undershoots the value at pressure balance by ...
The hydrodynamic response of a gaseous medium to the passage of a series of brief, widely spaced, well collimated energy pulses (e.g., electron beam pulses, laser pulses, discharges, etc.) is studied. Fluid code simulations are reported over a wide range of parameters. Iterative analytic formulae are given for the density reduction profile resulting from each pulse. Shock production heating, as well as other dynamic effects, are included. (Author)
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