Gallery

Sound produced by the head-on collision of two ring vortices

A comparison of the sound predicted by the similation of the head-on collision of two ring vortices (see below) with the measured data of Kambe & Minota. The Lamb Vector and Mohring results are for two different ways of computing the sound from the vorticity, while the Dyson results are for a vortex filament model employed by Kambe & Minota. Note that the experimental results cease to be axisymmetric at about a dimensionless time of 105. (Uhlman 2003)

DNS of particle dispersion from the core of a turbulent vortex flow

Traditional stochastic models disperse particles randomly in turbulent flows. Experiments and DNS show that particles cluster in high concentration sheets due to centrifugal action of turbulent eddies.

Interaction of a supercritical vortex with a blade

Showing contours of the z-component of vorticity. The vorticity increases and core radius decreases on the bottom of the blade (opposite on top). Vortex-induced separation occurs on the bottom surface (not the leading edge). There is incomplete cutting of vortex.

Reentrant Jet Cavity Behind a Disk

Cut-away view of an axisymmetric cavity with a reentrant jet behind a disk cavitator with l/d = 5. Shades represent the disturbance potential. Solution has been revolved about the axis of symmetry to obtain cut-away view. (Uhlman 2006)

Drag Coefficient for a Conical Cavitator

Comparison of predicted and experimental drag coefficients for a 15 degree half angle cone cavitator for 2<l/d<10 (data from May 1975).

Adaptive box structure

Visualization of the box structure resulting from an Adaptive Fast Multipole Method (AFMM) as applied to a nonuniform distribution of points (the blue dots).

Cutaway View of Vorticity

Cutaway View of Pressure

Cutaway View of Radial Velocity

Cutaway View of Axial Velocity

Lagrangian Vortex Elements

Pressure on sampling grid