Abstract
A vortex core identification method based on instantaneous velocity field is outlined. A linear parameterization of velocity field within a tetrahedral cell enables us to find an analytic solution of streamline equation. Vortex core is identified as one of the streamline that passes through the centerline of a longitudinal vortex within a local tetrahedral computational cell. The formulation of the present approach is briefly described. Typical examples are also shown.
