The original votrex core alogrithm as described in Identification of Swirling Flow in 3-D Vector Fields is used on a turbine rotor calculation.

Note: Critical point theory gives one classification for the flow based on the local flow quantities. 3D points can display a limited number of flow topologies including swirling flow, expansion and compression (with either acceleration or deceleration). The flow outside this local view may be more complex and have aspects of all of these components. The local classification will depend on the strongest type. Also if there are two (strong) axes of swirl, the scheme will indicate a rotation that is a combination of these rotation vectors based on the relative strength of each. The vortices in this case are lost going aroung the crown of the blade where the flow accelaration is stronger than the swirl. After this region, the core is again marked.

Image courtesy of GE CR&D.