Effect of long-wavelength perturbations in nonlinear evolution of the ablative Rayleigh–Taylor mixing

We investigate herein how long-wavelength perturbations affect the nonlinear evolution of the multimode ablative Rayleigh–Taylor instability (ARTI). A single-mode ARTI with an initial small amplitude is first investigated to validate the reliability of the proposed simulation code. The results show...

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Bibliographic Details
Published in:Physics of plasmas 2023-06, Vol.30 (6)
Main Authors: Zhao, K. G., Li, Z. Y., Wang, L. F., Xue, C., Wu, J. F., Xiao, Z. L., Ye, W. H., Ding, Y. K., Zhang, W. Y., He, X. T.
Format: Article
Language:English
Subjects:
Ablation
Evolution
Perturbation
Plasma physics
Self-similarity
Simulation
Taylor instability
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Summary:We investigate herein how long-wavelength perturbations affect the nonlinear evolution of the multimode ablative Rayleigh–Taylor instability (ARTI). A single-mode ARTI with an initial small amplitude is first investigated to validate the reliability of the proposed simulation code. The results show that both linear growth rates and asymptotic bubble velocities obtained from simulations are in reasonable agreement with theoretical results. Initial perturbations with different long-wavelength perturbations are compared to investigate the contribution of the long-wavelength perturbations to the nonlinear evolution of the ARTI mixing. Beyond the nonlinear saturation limit [S. W. Haan, Phys. Rev. A 39, 5812 (1989)], the long-wavelength perturbation promotes the ARTI mixing and facilitates the development of the large-scale structure on the ablation surface. In the self-similar analysis, the simulation results indicate that the self-similar growth parameters decrease with increasing initial longest-wavelength modes.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0134926