Research into a theoretical mode of coherent structures in the wall region of a turbulent boundary layer induced by a wall local disturbance |
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Authors: | Changgen Lu Qinjuan Qi |
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Institution: | 1. College of Atmospheric Sciences,Nanjing University of Information Science & Technology,Nanjing 210044,China 2. College of Public Management,Nanjing University of Information Science & Technology,Nanjing 210044,China |
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Abstract: | 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. |
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Keywords: | Turbulent boundary layer Wall region Coherent structure Local disturbance |
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