We investigate fluids and continua using computational methods

Key Words: Eulerian methods, compressible flows, continuum mechanics, fluid mechanics, computational multi-phase and -component flow dynamics, diffused interfaces, non-linear viscoelasticity, cavitation bubble dynamics, droplets, high-strain-rate flow physics, fluid-structure interactions, high-performance computing, hybrid computing

Shock-induced bubble collapse near a viscoelastic solid

Flow-induced, high-strain-rate material deformations

In extreme conditions, fluid flow induces high-strain-rate deformations of materials. We study materials ranging from biological (soft, low stress) tissues to materials with strength (hard, high stress), e.g., metals in naval hydraulic and energy science applications.

Developed an Eulerian, high-order accurate interface-capturing model for gas, liquids and viscoelastic solids
Applied model to the Advected Upstream Method (AUSM) approach for shock-viscoelastic droplet interactions
Applied this framework to study cavitation bubble collapse near compliant materials

Viscoelastic (hyperelastic) stresses due to delta impulse bubble growth

Spherical bubble dynamics in soft matter

The manipulation of cavitating and bubbly flows is critical to prevent or enhance deleterious effects in naval hydraulic, energy science, and biomedical applications. It is assumed that the bubble remains spherical and oscillates in volume in response to its contents and the surrounding material forces.

Collaborated with experimental researchers to study laser- and ultrasound-generated spherical bubbles
Studied spherical, single bubble dynamics in viscoelastic environments pertinent to modeling tissue damage and ultrasound wave form in biomedical applications
Studying the non-linear wave energy losses due to laser-induced cavitation bubbles

Shock-induced collapse of a bubble near a model kidney stone

Non-spherical bubble/droplet dynamics near objects

The manipulation of cavitating, bubbly flows is critical to prevent or enhance deleterious effects in naval hydraulic, energy science, and biomedical applications. Below are my contributions to this area:

We studied the inertia-driven bubble collapse dynamics in a channel to determine the effect of confinement
We developed a potential flow model to study asymmetric cylinder collapse for 3D Eulerian-Eulerian sub-grid bubble cloud models
Our implementation is in the open-source solver MFC to study cavitating bubbles undergoing phase change