中文摘要：

流体力学界面不稳定性及其后期的界面混合现象,是一种十分复杂的多尺度非线性物理问题,在惯性约束聚变、天体物理以及水中爆炸等领域有着广泛的应用前景,对该问题的研究不仅具有很高的学术价值,而且对促进相关领域的发展具有重要意义.中国工程物理研究院流体物理研究所基于Euler有限体积方法,发展了适用于可压缩多介质黏性流动具有多亚格子尺度模型的大涡模拟程序MVFT,并评估分析了不同亚格子尺度模型对界面不稳定性及界面混合的模拟能力;提出了流场非均匀性对R-M不稳定性影响的问题,并在激波驱动轻重气体双模扰动R-M界面不稳定性实验中成功应用并解读了新的实验现象和规律,在此基础上进而开展了反射激波作用下两种初始非均匀流场界面不稳定性引起的界面混合数值模拟研究,探讨了流场非均匀性对激波反射后强非线性阶段界面不稳定性发展、演化规律的影响,近期还对非均匀流场R-M不稳定性的演化规律、初始流场非均匀性和初始扰动效应及其影响的物理机制进行了分析和研究.

英文摘要：

Interface instability and turbulent mixing are complex multi-scale nonlinear physical problems,which have been found and utilized widely in man-made applications and natural phenomena such as inertial confinement fusion （ ICF）, high-speed combustion,and astrophysics （ i .e. supernova explosions）,so this problem has gained significant attention in science and technology. The Institute of Fluids Physics,China Academy of Engineering Physics has developed a large eddy simulation code MVFT （ multi-viscous flow and turbulence） with different SGS models, based on Eulerian finite volune method. Meanwhile, the ability of different SGS models for simulating the interface instability and interface mixing has been evaluated in research. The effect of nonuniformity of flow field on the Richtmyer-Meshkov （ R-M） instability was put for-ward, which has been successfully used to explain the related new experiment phenomenon and laws of the R-M instability. Given the found mechanism,the R-M instability and interface mixing in nonuniform flow were further studied and the effect of nonuniformity on the interface instability development in the strong nonlinear stage was discussed. Recently, the effects of initial perturbation on the R-M instability have been researched as well. Distinctive evolution mechanisms of R-M instabilitybetween the nonuniform flows and the uniform flows were analyzed in detail.