@Article{CiCP-19-251,
author = {Kun Yang, Zhenhua Xia, Yipeng Shi and Shiyi Chen},
title = {Effect of Oscillation Structures on Inertial-Range Intermittence and Topology in Turbulent Field},
journal = {Communications in Computational Physics},
year = {2018},
volume = {19},
number = {1},
pages = {251--272},
abstract = {<p style="text-align: justify;">Using the incompressible isotropic turbulent fields obtained from direct numerical
simulation and large-eddy simulation, we studied the statistics of oscillation
structures based on local zero-crossings and their relation with inertial-range intermittency
for transverse velocity and passive scalar. Our results show that for both
the velocity and passive scalar, the local oscillation structures are statistically scale-invariant
at high Reynolds number, and the inertial-range intermittency of the overall
flow region is determined by the most intermittent structures characterized by one
local zero-crossing. Local flow patterns conditioned on the oscillation structures are
characterized by the joint probability density function of the invariants of the filtered
velocity gradient tensor at inertial range. We demonstrate that the most intermittent
regions for longitudinal velocity tend to lay at the saddle area, while those for the transverse
velocity tend to locate at the vortex-dominated area. The connection between the
ramp-cliff structures in passive scalar field and the corresponding saddle regions in the
velocity field is also verified by the approach of oscillation structure classification.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.120515.280815a},
url = {http://global-sci.org/intro/article_detail/cicp/11088.html}
}