| Autor: |
Miles, A. R., Blue, B., Edwards, M. J., Greenough, J. A., Hansen, J. F., Robey, H. F., Drake, R. P., Kuranz, C., Leibrandt, D. R. |
| Předmět: |
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| Zdroj: |
Physics of Plasmas; May2005, Vol. 12 Issue 5, p056317, 10p |
| Abstrakt: |
Perturbations on an interface driven by a strong blast wave grow in time due to a combination of Rayleigh–Taylor, Richtmyer–Meshkov, and decompression effects. In this paper, results from three-dimensional (3D) numerical simulations of such a system under drive conditions to be attainable on the National Ignition Facility [E. M. Campbell, Laser Part. Beams 9, 209 (1991)] are presented. Using the multiphysics, adaptive mesh refinement, higher order Godunov Eulerian hydrocode, Raptor [L. H. Howell and J. A. Greenough, J. Comput. Phys. 184, 53 (2003)], the late nonlinear instability evolution, including transition to turbulence, is considered for various multimode perturbation spectra. The 3D post-transition state differs from the 2D result, but the process of transition proceeds similarly in both 2D and 3D. The turbulent mixing transition results in a reduction in the growth rate of the mixing layer relative to its pretransition value and, in the case of the bubble front, relative to the 2D result. The post-transition spike front velocity is approximately the same in 2D and 3D. Implications for hydrodynamic mixing in core-collapse supernovae are discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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