Three-Dimensional Pitching Panel Wake: Lagrangian Analysis and Momentum Distribution from Experiments

Kumar, Rahul; King, Justin T.; Green, Melissa A.

doi:10.2514/1.j056621

Cited by 5 publications

(2 citation statements)

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“…In the present study, the FTLE fields for all cases are computed using the backward time integration for a better visualization of the vortex shedding. The LCS visualization is presented in comparison with the Q-criterion in order to be consistent with previously published studies [3,13,22]. 196 descriptions of these discretization methods can be found in Ref.…”

Section: Lagrangian Coherent Structures Analysismentioning

confidence: 78%

“…In contrast, Lagrangian coherent structures (LCS) methods proposed by Haller [6] and studied by 49 Shadden et al [12] and several other investigators [13,14,15] that it is relatively insensitive to the anomalies in the velocity data as long as the anomalies remain spatially and temporarily localized [13,14,15]. LCS methods have been used successfully for experimental and computational studies.…”

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confidence: 99%

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Vortex identification in turbulent flows past plates using the Lagrangian method

et al. 2019

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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.

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Section: Lagrangian Coherent Structures Analysismentioning

confidence: 78%