Experimental investigation of two-dimensional Rayleigh-Taylor instability with controllable initial conditions
文献类型：期刊论文
| 作者 | Liang, Yu1,2; Luo XS(罗喜胜)2,3 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-07-17 |
| 卷号 | 1015页码:23 |
| 关键词 | buoyancy-driven instability instability |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.10306 |
| 通讯作者 | Liang, Yu(liangyu@imech.ac.cn) ; Luo, Xisheng(xluo@ustc.edu.cn) |
| 英文摘要 | Experimental investigation of the Rayleigh-Taylor instability (RTI) and its dependence on initial conditions has been challenging, primarily due to the difficulty of creating a well-defined gaseous interface. To address this, a novel soap film technique was developed to create a discontinuous two-dimensional SF $_6$ air interface with precisely controlled initial conditions. High-order modes were superimposed on a long-wavelength perturbation to study the influence of initial conditions on RTI evolution. Experiments conducted at Atwood numbers ranging from 0.26 to 0.66 revealed that bubble growth shows a weak dependence on both initial conditions and Atwood numbers, whereas spike growth is more influenced by these factors. Spike growth accelerates as the wavenumber of the imposed high-order modes decreases and/or the Atwood number increases. To quantify these effects, a variation on the previously developed potential flow model was applied, capturing the suppression of high-order modes and Atwood number dependence on RTI growth. In turbulent flow, the self-similar factors of bubbles and spikes exhibit minimal sensitivity to initial conditions. However, in relation to the Atwood number, the self-similar factors of bubbles (or spikes) demonstrate negligible (or significant) dependence. Comparisons with literature revealed that two-dimensional flows yield lower self-similar factors than three-dimensional flows. Furthermore, the discontinuity of the initial interface in this study, achieved through the soap film technique, results in faster spike growth compared with previous studies involving a diffusive initial interface. These findings provide critical insights into the nonlinear dynamics of RTI and underscore the importance of well-characterised initial conditions in experimental studies. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | RICHTMYER-MESHKOV INSTABILITY ; NUMERICAL-SIMULATION ; PERTURBATIONS ; DEPENDENCE |
| 资助项目 | Natural Science Foundation of China[12388101] ; Natural Science Foundation of China[24FAA00998] ; CAS Pioneer Hundred Talents Program |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001530118500001 |
| 资助机构 | Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program |
| 其他责任者 | Liang, Yu，罗喜胜 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102059]  |
| 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.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; 3.Univ Sci & Technol China, Dept Modern Mech, Adv Prop Lab, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang, Yu,Luo XS. Experimental investigation of two-dimensional Rayleigh-Taylor instability with controllable initial conditions[J]. JOURNAL OF FLUID MECHANICS,2025,1015:23. |
| APA | Liang, Yu,&罗喜胜.(2025).Experimental investigation of two-dimensional Rayleigh-Taylor instability with controllable initial conditions.JOURNAL OF FLUID MECHANICS,1015,23. |
| MLA | Liang, Yu,et al."Experimental investigation of two-dimensional Rayleigh-Taylor instability with controllable initial conditions".JOURNAL OF FLUID MECHANICS 1015(2025):23. |
入库方式： OAI收割
来源：力学研究所
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