| 近壁湍流边界层相干结构形成的动力学分析 |
| |
| 引用本文： | 沈露予,陆昌根,赵玲慧.近壁湍流边界层相干结构形成的动力学分析[J].南京气象学院学报,2012,4(4):330-333. |
| |
| 作者姓名： | 沈露予 陆昌根 赵玲慧 |
| |
| 作者单位： | 南京信息工程大学 大气科学学院,南京,210044;南京信息工程大学 大气科学学院,南京,210044;南京信息工程大学 大气科学学院,南京,210044 |
| |
| 基金项目： | 国家自然科学基金(10872097);国家863计划专项(2009AA03Z107) |
| |
| 摘 要： | 以壁面脉冲扰动来构建湍流边界层近壁区对称与非对称相干结构理论模式,采用直接数值模拟的方法,研究了湍流边界层近壁区对称与非对称相干结构形成的理论机制和演化规律.计算结果显示非对称相干结构比对称相干结构更容易增长,这是由于非对称型结构能在湍流边界层近壁区域诱导产生较大的展向扰动速度,且不同初始结构类型分布对湍流边界层近壁区相干结构形成的动力学机制不同所致,从而加深了对近壁湍流边界层单个相干结构形成的某种动力学机制的认识理解.
|
| 关 键 词： | 近壁湍流边界层 壁面脉冲扰动 相干结构 |
| 收稿时间： | 2011/5/19 0:00:00 |
Dynamic analysis of coherent structures formation in a near-wall turbulent boundary layer |
| |
| SHEN Luyu,LU Changgen and ZHAO Linghui.Dynamic analysis of coherent structures formation in a near-wall turbulent boundary layer[J].Journal of Nanjing Institute of Meteorology,2012,4(4):330-333. |
| |
| Authors: | SHEN Luyu LU Changgen and ZHAO Linghui |
| |
| Institution: | School of Atmospheric Science,Nanjing University of Information Science & Technology,Nanjing 210044;School of Atmospheric Science,Nanjing University of Information Science & Technology,Nanjing 210044;School of Atmospheric Science,Nanjing University of Information Science & Technology,Nanjing 210044 |
| |
| Abstract: | The theoretical model of symmetrical and asymmetrical coherent structures in a near-wall turbulent boundary layer is established through study into the impulsive disturbance on the wall in this paper.Theoretical mechanism and evolution process of the coherent structures formation are studied by Direct Numerical Simulation (DNS).The numerical result reveals that asymmetrical coherent structures are more likely to grow than symmetrical coherent structures,due to the larger span wise velocity induced by asymmetrical coherent structures in the near-wall area.And the dynamical mechanics of the coherent structures in the near-wall turbulent boundary layer vary with different distributions of initial structure.The proposed model relatively represents the real condition of fluid motion,and will help to improve the understanding of the dynamical mechanics of single coherent structure formation in the near-wall turbulent boundary layer. |
| |
| Keywords: | near-wall turbulent boundary layer impulsive disturbance coherent structure |
|
| 点击此处可从《南京气象学院学报》浏览原始摘要信息 |
| 点击此处可从《南京气象学院学报》下载免费的PDF全文 |
