Left heart simulator
Left heart simulator

Flexible-walled physical model of the human left ventricle illuminated using a green laser sheet for visualization of fluid flow.

Wing-wing interaction in flapping flight of tiny insects
Wing-wing interaction in flapping flight of tiny insects

A robotic platform of 'clap and fling' interaction is used to provide kinematics corresponding to flapping flight in tiny insects with bristled wings. Leading edge vortices (at the top) are observed when the wings rotate about their trailing edges (at the bottom).

Metachronal swimming in crustaceans
Metachronal swimming in crustaceans

High-speed videos are used to obtain pleopod kinematics in ghost shrimp individuals. This data is used to drive robotic models for mechanistic studies of metachronal swimming.

Feeding currents generated by upside-down jellyfish
Feeding currents generated by upside-down jellyfish

Dye injected along sandy surface is pulled sideways by pulsing jellyfish and moved vertically into the water column. Oral arms of the medusa aid in breakup of coherent large-scale vortices.

Flapping flight using bristled wings
Flapping flight using bristled wings

Many tiny insects (size < 1 mm) that fly use bristled wings. We examine the underlying aerodynamics using physical models.

Pore water pumping by upside-down jellyfish
Pore water pumping by upside-down jellyfish

Fluorescent dye buried underneath sandy substrate is released into the water column by bell pulsations of upside-down jellyfish.

Robotic model studies of metachronal paddling
Robotic model studies of metachronal paddling

Hydrodynamic interactions in between neighboring swimming limbs (pleopods) in metachrony are studied using a robotic platform (inset image) that is outfitted with physical models of hinged pleopods.

Vertical mixing by upside-down jellyfish
Vertical mixing by upside-down jellyfish

Vertical mixing effected by pulsing activity of upside-down jellyfish is visualized using planar laser induced fluorescence.

Intraventricular filling vortex in diastolic dysfunction
Intraventricular fi lling vortex in diastolic dysfunction

Intraventricular filling flows are examined using flexible-walled physical models incorporated into a left heart simulator. Comparison of flow patterns in normal left ventricle morphology (left) versus obstructive hypertrophic cardiomyopathy (right) at a heart rate of 100 bpm is shown here. Flows are visualized using particle image velocimetry (PIV).