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Molecular Dynamic simulation on hydrodynamic instability of interface due to convergence shock and vortex dynamics

收敛激波和涡动力学引起的界面流体动力学不稳定性的分子动力学模拟

基本信息

批准号：
14380211
负责人：
NISHIHARA Katsunobu
金额：
$ 9.28万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

We have investigated nonlinear evolution of hydrodynamic instabilities, such as the Richtmyer-Meshkov instability(RMI) and the Rayleigh-Taylor instability(RTI) induced by converging shock, with the use of Molecular Dynamic(MD) simulations. We have developed a new MD code for macroscopic hydrodynamic simulations and nonlinear theories for a study of vortex dynamics with density jump at an interface. Main results can be summarized as follows.1.Large scale Molecular Dynamic simulation codeWe have developed a new large scale MD simulation code with a suitable potential barrier for converging shock drive. The code was parallelized for many computers connected through a computer network, such as SUPER SINET. A new dynamic domain composition method was developed, in which computational domains are dynamically reconstructed according computational environment. The scalability of the method was proofed with the use of 720 computers and also super-computers connected through the SUPER SINET.2.Nonlinear evolution of the Richtmyer-Meshkov instability.With the use of the MD simulations existence of Mach shock and Mach stem were examined. Nonlinear stability of a rippled shock in converging geometry was also investigated. Nonlinear evolution of RMI was also studied in a cylindrical geometry for the first time, in which unstable interface is strongly deformed due to reflected shocks. A fully nonlinear theory was developed for vortex dynamics of an interface with density difference. We have shown dependence of nonlinear growth of bubble and spike and double spiral structures on density jumps and initial vorticity.3.Nonlinear evolution of the Rayleigh-Taylor instabilityWe have shown that anomalous diffusion occurs due to the vorticity in the spiral in RTI with the use of MD simulations. We have also developed a nonlinear theory in which asymptotic nonlinear growth of a bubble and its curvature were obtained as a function of density difference.

利用分子动力学（MD）模拟方法研究了由会聚激波引起的流体动力学不稳定性，如Richtmyer-Meshkov不稳定性（RMI）和Rayleigh-Taylor不稳定性（RTI）的非线性演化。我们已经开发了一个新的宏观流体动力学模拟和非线性理论的研究在界面处的密度跳跃的涡旋动力学的MD代码。主要结果如下：1.大规模分子动力学模拟程序我们开发了一个新的大规模分子动力学模拟程序，该程序具有合适的势垒，可以模拟会聚激波驱动。该代码被并行化，用于通过计算机网络连接的许多计算机，例如SUPER SINET。提出了一种新的动态域合成方法，根据计算环境动态重构计算域。用720台计算机和通过SUPER SINET连接的超级计算机证明了该方法的可扩展性。2. Richtmyer-Meshkov不稳定性的非线性演化利用MD模拟研究了马赫激波和马赫茎的存在。研究了收敛几何中波纹激波的非线性稳定性。首次研究了圆柱几何条件下的RMI非线性演化，其中不稳定界面由于反射激波而发生强烈变形。本文发展了一个完全非线性的密度差界面涡动力学理论。研究了气泡、尖峰和双螺旋结构的非线性增长对密度跳跃和初始涡的依赖性。3. Rayleigh-Taylor不稳定性的非线性演化利用分子动力学模拟研究了RTI中螺旋结构中的涡量引起的反常扩散。我们还发展了一个非线性理论，在这个理论中，气泡的渐近非线性增长和它的曲率是密度差的函数。

项目成果

期刊论文数量（92）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Destruction of a solid film under the action of ultrashort laser pulse

DOI：
10.1134/1.1600815
发表时间：
2003-06
期刊：
Journal of Experimental and Theoretical Physics Letters
影响因子：
0
作者：
S. Anisimov;V. Zhakhovskiĭ;V. Zhakhovskiĭ;N. Inogamov;K. Nishihara;A. Oparin;Y. Petrov
通讯作者：
S. Anisimov;V. Zhakhovskiĭ;V. Zhakhovskiĭ;N. Inogamov;K. Nishihara;A. Oparin;Y. Petrov

T.Zh.Esirkepov et al.: "Proposed Double-Layer Target For the Generation of High-Quality Laser Accelerated Ion Beams"Physical Review Letters. 89・17. 175003-1-175003-4 (2002)

T.Zh.Esirkepov 等人：“提出的用于生成高质量激光加速离子束的双层靶”物理评论快报 89・17（2002 年）。