On coherent-vortex identification in turbulence

By Y. Dubief, F. Delcayre. 2000

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Wall-layer models for large-eddy simulations (2008, background): “which has been shown to be effective in highlighting coherent vortical structures [51,52].”
Implicit Large Eddy Simulation of transition to turbulence at low Reynolds numbers using a Discontinuous Galerkin method (2011, methodology): “A way of identifying vortical coherent structures in a flow is to use the q-criterion proposed by Dubeif and Delcayre [37] and defined as q≡ 2 ( ij ij−SijSij ) , (9)”
Large Eddy Simulations and Experiments of Flow Around Finite-Height Cylinders (2010, methodology): “criterion was preferred to the often used λ2-criterion, the Q-criterion or similar criteria [36].”
On the relationships between local vortex identification schemes (2005, background): “For example, Jeong & Hussain (1995) observe significant differences in various flow examples, whereas Dubief & Delcayre (2000) see remarkably similar looking structures for many turbulent flows.”
Geometry and clustering of intense structures in isotropic turbulence (2004, background): “However, Dubief & Delcayre (2000) showed that the results from these two criteria are indistinguishable in the particular case of homogeneous turbulence, and that they agree well for strong vortices with a simple thresholding of the vorticity field.”