Detecting vortical structures in time-resolved volumetric flow fields

The detection of three-dimensional coherent vortical structures that get advected as well deformed with time is a challenge. However, it critical for the statistical analysis these vortices, example, quasi-streamwise vortices (QSVs) in near field turbulent shear layer, where cavitation inception typically occurs. These exhibit underlying correlations among different properties can be derived from velocity gradients. Exploiting correlations, pseudo-Lagrangian vortex method proposed uses k-means clustering based on vorticity magnitude and direction, values λ2, strain rate structure, axial stretching, location. facilitates finding QSVs have pressure minima are lower than those surrounding flow, including primary spanwise vortices. appear after period stretching before contraction events.