“…flow-path constriction), is a fundamental and widely investigated flow process characterized by a wide range of three-dimensional instabilities. Hence, complex, perturbationsensitive, recirculating-flow topologies are common to arise even in the laminar-flow regime and concerning simplified geometrical configurations (Wilhelm et al 2003). In reference to high-velocity, turbulent liquid flows, onset of a recirculating-flow pattern having a significant vorticity magnitude is possible to cause enough tension at its core, so as to force the liquid to nucleate, hence, giving rise to a vortical cavity.…”