Research into a theoretical mode of coherent structures in the wall region of a turbulent boundary layer induced by a wall local disturbance  

作　　者：Changgen Lu Qinjuan Qi 

机构地区：[1]College of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China [2]College of Public Management, Nanjing University oflnformation Science & Technology, Nanjing 210044, China

出　　处：《Progress in Natural Science:Materials International》2009年第9期1119-1124,共6页自然科学进展·国际材料（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10672052);the Natural Science Foundation of the Jiangsu Province of China(Grant No. BK2007178);the Science Foundation of Nanjing University of Information Science & Technology(20080101)

摘　　要：The idea of applying direct numerical simulation (DNS), a theoretical mode of coherent structures in the wall region of a turbulent boundary layer, has been discussed in the literature. The various aspects of the formation mechanism of the coherent structures agree well with both DNS and experimental results. In addition, a close relationship has been found between the evolutional characteristics and factors such as the magnitude and structural distribution of the wall local impulse disturbance, and the amount of energy a local disturbance introduces into the wall region. Moreover, these parameters play key roles in the formation of coherent structures near the wall region of a turbulent boundary layer. Therefore, the wall local impulse disturbance provides a theoretical model for triggering the formation of coherent structures in the wall region of a turbulent boundary layer.The idea of applying direct numerical simulation （DNS）, a theoretical mode of coherent structures in the wall region of a turbulent boundary layer, has been discussed in the literature. The various aspects of the formation mechanism of the coherent structures agree well with both DNS and experimental results. In addition, a close relationship has been found between the evolutional characteristics and factors such as the magnitude and structural distribution of the wall local impulse disturbance, and the amount of energy a local disturbance introduces into the wall region. Moreover, these parameters play key roles in the formation of coherent structures near the wall region of a turbulent boundary layer. Therefore, the wall local impulse disturbance provides a theoretical model for triggering the formation of coherent structures in the wall region of a turbulent boundary layer.

关 键 词：Turbulent boundary layer Wall region Coherent structure Local disturbance 

分 类 号：O357.52[理学—流体力学] O357.5[理学—力学]