Los puntos clave no están disponibles para este artículo en este momento.
The fragmentational instability of an infinite isothermal gas layer, extending infinitely in the xand y-direction, is investigated by means of threedimensional numerical simulations. The nonlinear growth of perturbations with the initial wave pattern, cos(kxx) x cos(kyy), is calculated for various values of the wave numbers kx and kyo For unstable modes, the fragmentation of a layer and the subsequent collapse of fragments are simulated. It is found that, if the ratio, ky/kx, is in the range, 0.8-1.2, each fragment collapses almost axisymmetrically without flattening along the z-axis. However, if the ratio is greater than 1.2 or less than 0.8, each fragment becomes more and more slender as it collapses and finally a thin filament is formed. We also calculate the growth of random perturbations and confirm that a large number of filaments are formed.
Miyama et al. (Tue,) studied this question.