I have been interested in microscale effects on the bulk response of materials. Most materials have
features at smaller length scales which affect their mechanical behaviour. However, models which
incorporate such microscale effects are only recently being developed. The problems I have been working
on fall into three main areas:

Microstructure Evolution

Polycrsytalline grain growth

I have used phase field models to study the kinetics of polycrystalline grain growth in the presence of
mobile second phase particles. Currently, we are working on incorporating grain rotation into phase field
models as well as studying recrystallization kinetics and modeling grain boundary engineering.

Solid-solid transformations in shape memory alloys

The kinetics of twin boundary motion show stick slip behaviour which originates from lattice vibrations.
Discrete models and phase field approaches have proved useful to study such kinetics and the effect on
mechanical behaviour of shape memory alloys.

Microfluidics

We have been modeling the fluid flow in microchannels using Dissipative Particle Dynamics. In collaboration with
Prof. BSV Patnaik we have developed
new approaches of incorporating boundary conditions in DPD to minimize density fluctuations at walls and
also studied the effect of finite slip boundary conditions on flow in microchannels. We have used a
particular configuration to model separation of DNA strands of different lengths in straight microchannels.

Granular Slurries

In collaboration with Prof. Mahesh Panchagnula, we have been modelling flow of wet granular slurries
in a square cavity. Our model of the slurry is novel (Granular Matter, 2015) and applicable to cases in which the fluid inertia
is small relative to the particle inertia in any representative area element. The video below shows how
mixing of the granular slurry happens in the square cavity driven by a belt at the bottom. The belt is moving
to the right and a value of a mixing parameter is being tracked in the figure on the right.