A buoyancy-drag model with a time-varying drag coefficient for evaluating bubble front penetration depth
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866909445372510208 |
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| author | Liu, Dongxue Tao, Tao Li, Jun Jia, Qing Yan, Rui Zheng, Jian |
| author_facet | Liu, Dongxue Tao, Tao Li, Jun Jia, Qing Yan, Rui Zheng, Jian |
| contents | To evaluate and control bubble front penetration depth ${{h}_{B}}$ 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 ${{h}_{B}}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_12392 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A buoyancy-drag model with a time-varying drag coefficient for evaluating bubble front penetration depth Liu, Dongxue Tao, Tao Li, Jun Jia, Qing Yan, Rui Zheng, Jian Fluid Dynamics To evaluate and control bubble front penetration depth ${{h}_{B}}$ 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 ${{h}_{B}}$ 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. |
| title | A buoyancy-drag model with a time-varying drag coefficient for evaluating bubble front penetration depth |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2411.12392 |