Self-similar bubble-front evolutions of ablative Rayleigh–Taylor instability seeded by localized perturbations
| Autor: | J. Y. Fu, H. S. Zhang, H. B. Cai, S. P. Zhu |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 30:022701 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Two-dimensional numerical simulations are carried out to investigate the nonlinear bubble growth of ablative Rayleigh–Taylor instability (ARTI) seeded by localized perturbations (LPs), where the LPs are described by a Gaussian mode. It is found that the nonlinear bubble-front penetration of LP-seeded ARTI follows the self-similar scaling law [Formula: see text], different from the classical case, where the self-similar behavior is not observed. It is also found that the quadratic growth coefficient [Formula: see text] in the LP-seeded ARTI mainly depends on the initial perturbation amplitude and initial perturbation width. When the perturbation amplitude is small, [Formula: see text] has a value of ∼0.03, which is not sensitive to the perturbation width. As the perturbation amplitude increases, the value of [Formula: see text] increases, and the phenomenon is more significant when the perturbation width is narrower. It is shown that the increase in [Formula: see text] is due to the spike-induced upward jet and the ablation-generated vorticity inside the bubble. |
| Databáze: | OpenAIRE |
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