rankine This dataset is an analytical model of a vortex street. The data is a set of four Rankine vortices in a left-to-right horizontal flow. The vortex strength decreases from left to right. rankine.ds: density, velocity, and energy values on an implicit rectangular grid (density and energy are dummy values) rankine.swirl.ds: scalar swirl-parameter values on an implicit rectangular grid rankine.sm: the corresponding segmentation map (segmented by hand)