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| R-T界面不稳定性及湍流混合的大涡模拟 | |
| 引用本文： | 谢正桐,李家春,王丽丽. R-T界面不稳定性及湍流混合的大涡模拟[J]. 计算物理, 2002, 19(2): 108-114 |
| 作者姓名： | 谢正桐 李家春 王丽丽 |
| 作者单位： | 1. 中科院力学所工程科学部, 中科院非线性力学国家重点实验室(LNM), 北京 100080;2. 北京应用物理与计算数学研究所, 北京 100080 |
| 基金项目： | 国家自然科学基金委员会和中国工程物理研究院联合基金(10176032)、计算物理实验室基金试点项目及国家科学技术部攀登项目资助 |
| 摘 要： | 采用大涡模拟(LES)方法研究R-T(Rayleigh Taylor)不稳定性,显示了不稳定发展的小扰动阶段、变形阶段、规则非线性阶段、不规则非线性阶段和湍流混合阶段界面演化与特征,分析了湍流混合层厚度增长的规律,同时还研究了湍流二阶相关量如动量、质量和能量通量在大尺度和亚格子尺度所占分量,验证了LES方法是处理R-T界面不稳定性和湍流混合的一种有效方法. |
| 关 键 词： | 界面不稳定性 湍流混合 大涡模拟 |
| 文章编号： | 1001-246X(2002)02-0108-07 |
| 收稿时间： | 2000-06-26 |
| 修稿时间： | 2000-06-26 |
LARGE EDDY SIMULATION OF R-T INSTABILITY AND TURBULENT MIXING |
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| XIE Zheng-tong,LI Jia-chun,WANG Li-li. LARGE EDDY SIMULATION OF R-T INSTABILITY AND TURBULENT MIXING[J]. Chinese Journal of Computational Physics, 2002, 19(2): 108-114 | |
| Authors: | XIE Zheng-tong LI Jia-chun WANG Li-li |
| Affiliation: | 1. DES and LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P R China;2. Institute of Applied Physics and Computational Mathematics, Beijing 100088, P R China |
| Abstract: | The Rayleigh-Taylor instability is numerically studied through the Large-Eddy-Simulation (LES) approach.The whole evolution process of the instability is achieved,including the linear stage,the regular nonlinear stage,the irregular nonlinear stage and the turbulent mixing stage.The characteristic of the interfacial motion and the growth of the mixing layer thickness are analyzed.And the averaged turbulent energy as well as the flux of passive scalar is calculated at both the resolved scale and the subgrid scale.The LES method is proved to be an effective approach for the simulation of the Rayleigh-Taylor instability. |
| Keywords: | interfacial instability turbulent mixing large-eddy-simulation |
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