A buoyancy-drag model with a time-varying drag coefficient for evaluating bubble front penetration depth
Abstract
To evaluate and control bubble front penetration depth induced by ablative Rayleigh-Taylor instability (ARTI) from a weakly nonlinear phase to a self-similar phase, we first propose an improved buoyancy-drag (BD) model with a time-varying drag coefficient. The coefficient incorporates the influence of multiple physical mechanisms, including non-steady ablation, preheating, and other mechanisms during this phase. The model is validated through simulations under various conditions, demonstrating improved accuracy compared to the classical BD model and the self-similar growth. Furthermore, the model suggests controlling by suppressing the "most dangerous mode", which is influenced by initial perturbations and ablative acceleration history, thus offering novel insights for target manufacturing and pulse optimization near the ignition threshold.
Keywords
Cite
@article{arxiv.2411.12392,
title = {A buoyancy-drag model with a time-varying drag coefficient for evaluating bubble front penetration depth},
author = {Dongxue Liu and Tao Tao and Jun Li and Qing Jia and Rui Yan and Jian Zheng},
journal= {arXiv preprint arXiv:2411.12392},
year = {2025}
}