Vortex Identification in a Free-Surface Flow Problem Solved Using SPH

This article focuses on vortex structure identification methods and their implementation into smoothed particle hydrodynamics (SPH) framework. The most common criteria based the local velocity gradient tensor analysis like Q-criterion, Δ-criterion, λ 2 -criterion are introduced together with for SPH data. A two-dimensional ‘double dam break’ problem was chosen as a test case because it results in violent transient free-surface flow emerging vanishing eddies of various sizes intensities. Q-criterion Δ-criterion were virtually identical, whereas appeared to be restrictive identification, so best suppressing incorrect findings due numerical solution imperfection. therefore conducted using -criterion.