The Mechanism for the Production of Coherent Structures near Wall of a Turbulent Boundary Layer Excited by Wall Local Impulse Disturbance

Wei Guo Wu; Chang Gen Lu; Shi Feng Xue

doi:10.4028/www.scientific.net/AMR.668.521

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 668The Mechanism for the Production of Coherent...

The Mechanism for the Production of Coherent Structures near Wall of a Turbulent Boundary Layer Excited by Wall Local Impulse Disturbance

Abstract:

Origins of coherent structures near wall of a turbulent boundary layer has been studied by direct numerical simulation (DNS). Forming mechanism of coherent structures agrees well with DNS results. A close relationship has been found between the evolutional characteristics and factors such as the magnitude and structural distribution of the wall local impulse, and the amount of energy and the length of loading time that the initial local impulse disturbance introduces into the wall region. Moreover, these parameters play key roles in the formation of coherent structures near wall of a turbulent boundary layer. So, the wall local impulse disturbance provides the origins for inducing the formation of coherent structures in wall region of a turbulent boundary layer.

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Periodical:

Advanced Materials Research (Volume 668)

Pages:

521-524

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.668.521

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Online since:

March 2013

Authors:

Wei Guo Wu, Chang Gen Lu, Shi Feng Xue

Keywords:

Coherent Structure, Local Impulse Disturbance, Near Wall, Turbulent Boundary Layer

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