Energy transport characteristics of converging Richtmyer-Meshkov instability | |
Fu YW(符耀威)1,2; Yu ZP(于长平)1,2; Li XL(李新亮)1,2 | |
发表期刊 | AIP ADVANCES |
2020-10-01 | |
卷号 | 10期号:10页码:12 |
摘要 | In this paper, the Richtmyer-Meshkov (RM) instability in spherical and cylindrical converging geometries with a Mach number of about 1.5 is investigated by using the direct numerical simulation method. The heavy fluid is sulfur hexafluoride, and the light fluid is nitrogen. The shock wave converges from the heavy fluid into the light fluid. The main focus is on the energy transport characteristics in the mixing layer during the entire development process from early instability to late-time turbulent mixing. First, the turbulence kinetic energy transport equation is analyzed, and it is found that the production and dissipation mechanisms of the turbulence induced by the spherical and cylindrical converging RM instabilities in the mixing layer are the same. The turbulent diffusion terms are crucial in the whole development processes of the mixing layers. Before the reflected shock waves transit the interfaces, the dissipation terms can be ignored relative to other terms, and after that, the dissipation terms are close to the production terms and play an important role. The compressibility terms are approximate to the production terms and promote the production of turbulence kinetic energy in the later stage. The viscous diffusion terms can be ignored throughout the process. Then, the enstrophy transport equation is researched, and it is found that, in the mixing layers, the baroclinicity terms play a leading role in the early stage, while the vortex stretching terms play a leading role in the later stage, and the vortex stretching term of the spherical converging geometry develops faster than that of the cylindrical converging geometry. The compressibility terms are positive in the early stage, which promote the production of enstrophy. After the reflected shock waves transit the interfaces, the compressibility terms become negative, which inhibit the production of enstrophy. In addition, the results of the present direct numerical simulation also show that the density fluctuation spectra in the centers of the mixing layers of the spherical and cylindrical converging RM instabilities present the obvious -5/3 scaling law. (C) 2020 Author(s). |
DOI | 10.1063/5.0022280 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000576991000002 |
关键词[WOS] | TURBULENT MIXING DRIVEN ; RAYLEIGH-TAYLOR ; LAYER |
WOS研究方向 | Science & Technology - Other Topics ; Materials Science ; Physics |
WOS类目 | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied |
资助项目 | National Key Research and Development Program of China[2016YFA0401200] ; National Key Research and Development Program of China[2019YFA0405300] ; NSFC[91852203] ; Science Challenge Project[TZ2016001] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA17030100] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDC01000000] |
项目资助者 | National Key Research and Development Program of China ; NSFC ; Science Challenge Project ; Strategic Priority Research Program of Chinese Academy of Sciences |
论文分区 | Q3 |
力学所作者排名 | 1 |
RpAuthor | Li, Xinliang |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/85334 |
专题 | 高温气体动力学国家重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Fu YW,Yu ZP,Li XL. Energy transport characteristics of converging Richtmyer-Meshkov instability[J]. AIP ADVANCES,2020,10,10,:12. |
APA | Fu YW,Yu ZP,&Li XL.(2020).Energy transport characteristics of converging Richtmyer-Meshkov instability.AIP ADVANCES,10(10),12. |
MLA | Fu YW,et al."Energy transport characteristics of converging Richtmyer-Meshkov instability".AIP ADVANCES 10.10(2020):12. |
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