Volume 19, Issue 1
Effect of Oscillation Structures on Inertial-Range Intermittence and Topology in Turbulent Field

Kun Yang, Zhenhua Xia, Yipeng Shi & Shiyi Chen

Commun. Comput. Phys., 19 (2016), pp. 251-272.

Published online: 2018-04

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  • Abstract

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.

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@Article{CiCP-19-251, author = {}, 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 = {

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.

}, issn = {1991-7120}, doi = {https://doi.org/10.4208/cicp.120515.280815a}, url = {http://global-sci.org/intro/article_detail/cicp/11088.html} }
TY - JOUR T1 - Effect of Oscillation Structures on Inertial-Range Intermittence and Topology in Turbulent Field JO - Communications in Computational Physics VL - 1 SP - 251 EP - 272 PY - 2018 DA - 2018/04 SN - 19 DO - http://doi.org/10.4208/cicp.120515.280815a UR - https://global-sci.org/intro/article_detail/cicp/11088.html KW - AB -

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.

Kun Yang, Zhenhua Xia, Yipeng Shi & Shiyi Chen. (2020). Effect of Oscillation Structures on Inertial-Range Intermittence and Topology in Turbulent Field. Communications in Computational Physics. 19 (1). 251-272. doi:10.4208/cicp.120515.280815a
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