How do I track the vortex core in numerical simulations of 3D flow ?

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Domingo Tavella

There are several ways to do this, here is a paper with a nice summary:

https://www.cavs.msstate.edu/publications/docs/2005/01/3269visHandbook.pdf

Be careful with the apparently obvious idea of using the curl of the field, however.

Shrish Shukla

I would like to suggest you to plot either Lamda2 or Q-criteria components at negative value. It is most widely used to visualize the Vortex core structure.

S.Shukla