Single-mode Rayleigh-Taylor instability in time-dependent rarefaction-driven flows
文献类型：期刊论文
| 作者 | Li, Yue2; Gao, Xing2; Guo, Xu2; Zhai, Zhigang2; Luo XS(罗喜胜)1,2 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-07-30 |
| 卷号 | 1016页码:25 |
| 关键词 | gas dynamics |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.10354 |
| 通讯作者 | Guo, Xu(sanjing@ustc.edu.cn) ; Zhai, Zhigang(clguoxu@ustc.edu.cn) |
| 英文摘要 | Rayleigh-Taylor instability (RTI) caused by rarefaction waves not only features variable acceleration but also incorporates time-dependent density, which introduces great challenges in predicting the finger growth behaviours. In this work, we propose a model for predicting the single-mode finger behaviours by extending the Layzer potential-flow framework to account for time-dependent acceleration and density. Relative to the previous models, the present model can evaluate the effect of time-dependent density on finger growth, and can describe the growth behaviours of both bubbles and spikes in rarefaction-driven RTI flows. In addition, the time-dependent curvature of the finger tip as it evolves from its initial value to the quasi-steady value is quantified. To validate the model, rarefaction-tube experiments and numerical simulations are conducted across a wide range of initial conditions. The results show that the present model can accurately capture the amplitude growth and curvature evolution of bubbles and spikes across various density ratios. Moreover, both the present model and experiments demonstrate that the continuous density reduction in rarefaction-driven flows causes larger asymptotic velocities of bubbles and spikes, leading to higher Froude numbers relative to those under constant or time-dependent acceleration. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | FLUIDS ; PERTURBATIONS ; ACCELERATION ; SIMULATIONS ; SYSTEMS ; GROWTH ; WAVES |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001538872000001 |
| 其他责任者 | Guo, Xu，Zhai, Zhigang |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102337]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China 2.Univ Sci & Technol China, Dept Modern Mech, Hefei 230026, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Li, Yue,Gao, Xing,Guo, Xu,et al. Single-mode Rayleigh-Taylor instability in time-dependent rarefaction-driven flows[J]. JOURNAL OF FLUID MECHANICS,2025,1016:25. |
| APA | Li, Yue,Gao, Xing,Guo, Xu,Zhai, Zhigang,&罗喜胜.(2025).Single-mode Rayleigh-Taylor instability in time-dependent rarefaction-driven flows.JOURNAL OF FLUID MECHANICS,1016,25. |
| MLA | Li, Yue,et al."Single-mode Rayleigh-Taylor instability in time-dependent rarefaction-driven flows".JOURNAL OF FLUID MECHANICS 1016(2025):25. |
入库方式： OAI收割
来源：力学研究所
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