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Self-similar bubble-front evolutions of ablative Rayleigh–Taylor instability seeded by localized perturbations.
- Source :
- Physics of Plasmas; Feb2023, Vol. 30 Issue 2, p1-10, 10p
- Publication Year :
- 2023
-
Abstract
- 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 α b A T ∫ g d t 2 , different from the classical case, where the self-similar behavior is not observed. It is also found that the quadratic growth coefficient α b in the LP-seeded ARTI mainly depends on the initial perturbation amplitude and initial perturbation width. When the perturbation amplitude is small, α b has a value of ∼0.03, which is not sensitive to the perturbation width. As the perturbation amplitude increases, the value of α b increases, and the phenomenon is more significant when the perturbation width is narrower. It is shown that the increase in α b is due to the spike-induced upward jet and the ablation-generated vorticity inside the bubble. [ABSTRACT FROM AUTHOR]
- Subjects :
- RAYLEIGH-Taylor instability
SEEDS
RAYLEIGH waves
VORTEX motion
COMPUTER simulation
Subjects
Details
- Language :
- English
- ISSN :
- 1070664X
- Volume :
- 30
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Physics of Plasmas
- Publication Type :
- Academic Journal
- Accession number :
- 162171086
- Full Text :
- https://doi.org/10.1063/5.0132063