On the Taylor column driven motion of a buoyant sphere in a free-surface vortex core: An experimental study

The added drag on a buoyant body traveling in a solid-body rotation flow has been rigorously studied over the last century with G.I. Taylor being the first one to describe it in 1922, a hundred years ago. A recent publication by Duinmeijer (2021) investigated the capacity of free-surface vortices to transport solids as a practical application to...

Experimental study on the 3D-flow field of a free-surface vortex using stereo PIV

In order to analyse the flow characteristics of free-surface vortexes and to validate the Burgers vortex model by using stereo particle image velocimetry, experiments are conducted in a 600 mm diameter vortex tank. Measured axial velocities indicate that 10–25% of the flow is transported through the vortex core. The velocity profiles show that...

Assessment of Viscous Energy Loss and the Association with Three-Dimensional Vortex Ring Formation in Left Ventricular Inflow: In Vivo Evaluation Using Four-Dimensional Flow MRI

Purpose To evaluate viscous energy loss and the association with three-dimensional (3D) vortex ring formation in left ventricular (LV) blood flow during diastolic filling. Theory and Methods Thirty healthy volunteers were compared with 32 patients with corrected atrioventricular septal defect as unnatural mitral valve morphology and inflow are...

Three-dimensional flow and load characteristics of flexible revolving wings at low Reynolds number

Increasing interest in the field of micro air vehicles has stimulated research activities regarding biological flapping-wing flight. An important characteristic of biological flapping-wing flight that is not commonly taken into account in mechanical model simulations is the influence of wing flexibility. This experimental study explores the flow...

Three-dimensional flow and load characteristics of flexible revolving wings at low Reynolds number

This study explores the flow field and fluid-dynamic loads generated by revolving low-aspect-ratio flat plate wings undergoing a revolving motion starting from rest. Three wings with different degree of chordwise flexural stiffness (i.e., rigid, moderate flexibility and high flexibility) have been tested in order to investigate the influence of...

Propeller and inflow vortex interaction: vortex response and impact on the propeller performance

The aerodynamic operating conditions of a propeller can include complex situations where vorticity from sources upstream can enter the propeller plane. In general, when the vorticity enters in a concentrated form of a vortex, the interaction between the vortex and blade is referred to as blade–vortex interaction or BVI. The interaction may...

Vortex flow during early and late left ventricular filling in normal subjects: Quantitative characterization using retrospectively-gated 4D flow cardiovascular magnetic resonance and three-dimensional vortex core analysis

Background LV diastolic vortex formation has been suggested to critically contribute to efficient blood pumping function, while altered vortex formation has been associated with LV pathologies. Therefore, quantitative characterization of vortex flow might provide a novel objective tool for evaluating LV function. The objectives of this study...

DG and MUSCL approaches: Comparison of some recent variants

In this preliminary study, we compare the behavior of two classical numerical approaches in compressible fluid dynamics , the MUSCL and the Discontinuous Galerkin (DG) method, applied to aeroacoustics and vortex computation, these two fields being related as noise is often produced from vortex fluctuations. The calculation of the unsteady...

Vortex flow and Vortex breakdown above delta wing in high subsonic flow

Modelling of separation using Euler methods