My research interests are broadly classified into three categories
1. Driven Soft matter
Micron-scaled soft particles such as polymers, filaments, colloids and soft shells, driven by an external flow display rich dynamical behaviors in various physical environments. We study these systems using a hybrid stochastic-hydrodynamic simulation scheme, called Multiparticle Collision Dynamics (MPC).
2. Active matter
The individual components of active matter propel themselves using a continuous supply of energy, either generated internally or absorbed from the environment, and display highly dynamic, out-of-equilibrium patterns and structures. Collection of swimming bacteria, motor driven intercellular filaments, oscillating cilia and flagella and synthetic self propelling colloidal particles are a few examples of these systems. In many cases, their collective behavior can be studied from a condensed matter perspective, by including an ‘active’ term to each individual elements and by taking care of their interactions. We study these systems by a combination of analytical and numerical techniques.
3. Physics of sentient systems
Many of the biological systems in nature actively respond to sensory inputs and regulate their movements (such as growth and locomotion) accordingly. However, their response is limited by their intrinsic physical and mechanical constraints. In many cases the observed growth shape or locomotive behavior of a given organism is a result of these two factors, namely the sensitivity to the external input and the physical constraints. We are interested to study the diverse active movements observed in nature and try to understand them from this perspective.
Flagellar dynamics of a connected chain of active, polar, Brownian particles. Raghunath Chelakkot, Arvind Gopinath, L. Mahadevan and Michael F. Hagan, J. R. Soc. Interface, 11, 20130884 (2014).
Flow induced helical coiling of semiflexible polymer in structured microchannels.- Raghunath Chelakkot, Roland G. Winkler, Gerhard Gompper, Phys. Rev. Lett., 109, 178101 (2012).
Length dependence of crosslinker induced network formation of rods: a Monte Carlo study. Raghunath Chelakkot, Thomas Gruhn. Soft Matter, 8, 11746 (2012)
Semiflexible polymer conformation, distribution and migration in microcapillary flows Raghunath Chelakkot, Roland G. Winkler, Gerhard Gompper, J. Phys. Cond. Matter. 23, 184117 (2011)
Migration of semiflexible polymers in microcapillary flows, Raghunath Chelakkot, Roland G. Winkler, Gerhard Gompper, EPL, 91, 14001 (2010).