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| 1 | Numerical study on evolution of subharmonic varicose low-speed streaks in turbulent channel flow显示文摘The evolution of two spanwise-aligned low-speed streaks in a wall turbulent flow, triggered by the instability of the subharmonic varicose(SV) mode, is studied by a direct numerical simulation(DNS) method in a small spatial-periodic channel. The results show that the SV low-speed streaks are self-sustained at the early stage, and then transform into subharmonic sinuous(SS) low-speed streaks. Initially, the streamwise vortex sheets are formed by shearing, and then evolve into zigzag vortex sheets due to the mutual induction. As the intensification of the SV low-speed streaks becomes prominent,the tilted streamwise vortex tubes and the V-like streamwise vortex tubes can be formed simultaneously by increasing +? u? x. When the SV low-speed streaks break down, new zigzag streamwise vortices will be generated, thus giving birth to the next sustaining cycle of the SV low-speed streaks. When the second breakdown happens, new secondary V-like streamwise vortices instead of zigzag streamwise vortices will be generated. Because of the sweep motion of the fluid induced by the secondary V-like streamwise vortices, each decayed low-speed streak can be divided into two parts, and each part combines with the part of another streak, finally leading to the formation of SS low-speed streaks. | Jian LI Gang DONG Jianlei ZHANG | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，3： | 2 |
| 2 | 湍流大涡模拟的时空关联方法显示文摘本文介绍了湍流大涡模拟的时空关联方法,它用于检验和发展大涡模拟的亚格子尺度模型,其目的是提高大涡模拟方法对于欧拉和拉格朗日时空关联的预测准确度.现在广泛使用的湍流涡黏亚格子模型的理论基础是能量平衡方程,它们能够正确预测湍流的空间能量谱,但不能正确预测湍流的时间能量谱.本文针对大涡模拟的时间尺度问题,从时空耦合的观点出发,综述了作者近年来在时空关联方法方面的研究工作.理论分析和数值模拟结果表明,大涡模拟总是高估湍流的时间尺度,其物理机制是涡黏亚格子模型仅能耗散小尺度能量,但不能反映亚格子涡对大尺度涡的随机反馈作用.小尺度湍流会影响颗粒的聚集程度和相对扩散.建立亚格子湍流的拉格朗日时间尺度模型,为携带颗粒湍流大涡模拟中基于随机微分方程的颗粒相亚格子模型提供封闭参数,并用于颗粒湍流扩散的大涡模拟. | 晋国栋 陈进财 时北极 何国威 | 2015 | 中国科学:物理学、力学、天文学2015，45，12： | 0 |
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