TY - JOUR
T1 - Vortex identification in turbulent flows past plates using the Lagrangian method
AU - Attiya, Bashar
AU - Liu, I. Han
AU - Altimemy, Muhannad
AU - Daskiran, Cosan
AU - Oztekin, Alparslan
N1 - Funding Information:
This work used the Extreme Science and Engineering Discovery Environment (XSEDE) supported by National Science Foundation grant No. TG-CTS170051. The authors would like to thank Guanyang Xue for help with optimizing the MATLAB code to determine LCS structures.
Publisher Copyright:
© 2019 Published by NRC Research Press.
PY - 2019
Y1 - 2019
N2 - Vortex identifications in turbulent flows past arrays of tandem plates are performed by employing the velocity field obtained by high-fidelity large eddy simulations. Lagrangian coherent structures (LCSs) are extracted to examine the evolution and the nonlinear interaction of vortices and to characterize the spatial and temporal characteristics of the flow. LCSs' identification method is based on the finite-time Lyapunov exponent (FTLE), which is evaluated using the instantaneous velocity data. The simulations are performed in three-dimensional geometries to understand the physics of fluid motion and the vortex dynamics in the vicinity of plates and surfaces at Reynolds number of 50 000. The instantaneous vorticity fields, Eulerian Q-criterion, and LCSs are presented to interpret and understand complex turbulent flow structures. The three-dimensional FTLE fields provide valuable information about the vortex generation, spatial location, evolution, shedding, decaying, and dissipation of vortices. It is demonstrated here that FTLE can be used together with Eulerian vortex identifiers to characterize the turbulent flow field effectively.
AB - Vortex identifications in turbulent flows past arrays of tandem plates are performed by employing the velocity field obtained by high-fidelity large eddy simulations. Lagrangian coherent structures (LCSs) are extracted to examine the evolution and the nonlinear interaction of vortices and to characterize the spatial and temporal characteristics of the flow. LCSs' identification method is based on the finite-time Lyapunov exponent (FTLE), which is evaluated using the instantaneous velocity data. The simulations are performed in three-dimensional geometries to understand the physics of fluid motion and the vortex dynamics in the vicinity of plates and surfaces at Reynolds number of 50 000. The instantaneous vorticity fields, Eulerian Q-criterion, and LCSs are presented to interpret and understand complex turbulent flow structures. The three-dimensional FTLE fields provide valuable information about the vortex generation, spatial location, evolution, shedding, decaying, and dissipation of vortices. It is demonstrated here that FTLE can be used together with Eulerian vortex identifiers to characterize the turbulent flow field effectively.
KW - Lagrangian coherent structures
KW - Large eddy simulations
KW - Turbulent flows
KW - Visualization and dynamics
KW - Vortex detection
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U2 - 10.1139/cjp-2018-0625
DO - 10.1139/cjp-2018-0625
M3 - Article
AN - SCOPUS:85070374638
SN - 0008-4204
VL - 97
SP - 895
EP - 910
JO - Canadian Journal of Physics
JF - Canadian Journal of Physics
IS - 8
ER -