@Article{AAMM-9-429,
author = {Shen , Luyu and Lu , Changgen},
title = {On the Generation of Instability Tollmien-Schlichting Waves by Free-Stream Turbulence},
journal = {Advances in Applied Mathematics and Mechanics},
year = {2018},
volume = {9},
number = {2},
pages = {429--438},
abstract = {<p style="text-align: justify;">The beginning of the transition from the laminar to a turbulent flow is usually
the generation of instability Tollmien-Schlichting (T-S) waves in the boundary
layer. Previously, most numerical and experimental researches focused on generating
instability T-S waves through the external disturbances such as acoustic waves and
vortical disturbances interacting with wall roughness or at the leading-edge of flat-plate,
whereas only a few paid attention to the excitation of the T-S waves directly by
free-stream turbulence (FST). In this study, the generating mechanism of the temporal
mode T-S waves under free-stream turbulence is investigated by using direct numerical
simulation (DNS) and fast Fourier transform. Wave packets superposed by a group
of stability, neutral and instability T-S waves are discovered in the boundary layer. In
addition, the relation between the amplitude of the imposed free-stream turbulence
and the amplitude of the excited T-S wave is also obtained.</p>},
issn = {2075-1354},
doi = {https://doi.org/10.4208/aamm.2015.m998},
url = {http://global-sci.org/intro/article_detail/aamm/12157.html}
}