One unsteady flow shown three ways at once, where streamlines, pathlines and a streakline all disagree.

A dye blob sheared into a spiral between two cylinders reassembles when the crank is turned back, because creeping flow runs in reverse.

A rod jiggled in layered water sends internal waves out along four tilted beams whose angle is fixed by the drive frequency.

In a fast-spinning tank a drift swerves around a tall invisible column standing over a tiny floor bump.

Two-tone GPU particles wind the shear layer into a glowing cat's-eye vortex, the shape of billow clouds.

A smooth stream necks down and snaps into a train of drops because any ripple longer than its circumference keeps growing.

A wave packet drifts at the group speed while its crests race through at twice that, born at the back and dying at the front.

A hundred thousand particles trace the swirl of two leapfrogging vortex pairs, each darting through the other in turn.

A wall boundary layer thickens, then peels away into a reverse-flow bubble on the back of a hump unless wall suction holds it on.

Vortices shedding off a rod radiate the Aeolian tone as a dipole, loud above and below and silent along the wind.

Dye folded across every scale by a synthetic turbulent field, with its energy spectrum measured against Kolmogorov's -5/3 slope.

A GPU particle stream past a cylinder from clean flow to the drag crisis, with a live Cd-vs-Reynolds curve showing why the drag suddenly drops.

A magnetic field across a liquid-metal duct flattens the flow profile into a plug with paper-thin Hartmann layers at the walls.

One flow over a hump shown three ways at once: a smoke streakline, hydrogen-bubble timelines, and wall tufts that flip red at separation.

Three lanes of GPU particle flow past a rod, a strut and a wire, making the wake-width contrast that collapses form drag immediate.

A converging-diverging nozzle where lowering the back pressure plants a normal shock in the diverging cone, then blows it out into a diamond jet.

A dense molecular gas forms a bow shock on a cylinder; thin the gas out and the molecules fly straight through, leaving only a shadow.

The tea-leaf paradox: a weak cross-stream circulation in a stirred cup sweeps the leaves into a neat pile at the centre.

A hundred thousand tracer particles stream past a cylinder, coloured by speed so the streamlines themselves show the pressure field.

Newtonian, shear-thinning and Bingham fluids pushed down one channel show blunt profiles and a rigid central plug instead of a clean parabola.

Round fluid blobs deform into spinning ellipses, showing that any flow is translation plus rigid rotation plus pure stretch.

Fast flow over a hydrofoil drops the pressure below vapour pressure, growing a frothy sheet cavity whose shed bubbles implode downstream.