75 citations · 599 across the 29 of their papers we have counts for
29 papers
Evanescent Gels: Competition Between Sticker Dynamics and Single Chain Relaxation
Dominic Robe, Aritra Santra, Gareth H. McKinley +1
Solutions of polymer chains are modelled using non-equilibrium Brownian dynamics simulations, with physically associative beads which form reversible crosslinks to establish a syst…
Shear viscosity for finitely extensible chains with fluctuating internal friction and hydrodynamic interactions
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
An exact solution of coarse-grained polymer models with fluctuating internal friction and hydrodynamic interactions has not been proposed so far due to a one-to-all coupling betwee…
Universality of dilute solutions of ring polymers in the thermal crossover region between and athermal solvents
Aritra Santra, J. Ravi Prakash
Due to their unique topology of having no chain ends, dilute solutions of ring polymers exhibit behaviour distinct from their linear chain counterparts. The universality of their s…
How important are fluctuations in the treatment of internal friction in polymers?
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
The Rouse model with internal friction (RIF), a widely used theoretical framework to interpret the effects of internal friction on conformational transitions in biomolecules, is sh…
Heterogeneous interactions and polymer entropy decide organization and dynamics of chromatin domains
Kiran Kumari, J. Ravi Prakash, Ranjith Padinhateeri
Chromatin is known to be organized into multiple domains of varying sizes and compaction. While these domains are often imagined as static structures, they are highly dynamic and s…
Rouse model with fluctuating internal friction
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
A coarse-grained bead-spring-dashpot chain model with the dashpots representing the presence of internal friction, is solved exactly numerically, for the case of chains with more t…
Universal scaling and characterisation of gelation in associative polymer solutions
Aritra Santra, B. Dünweg, J. Ravi Prakash
A Brownian dynamics algorithm is used to describe the static behaviour of associative polymer solutions. Predictions for the fractions of stickers bound by intra-chain and inter-ch…
Viscometric Functions and Rheo-optical Properties of Dilute Polymer Solutions: Comparison of FENE-Fraenkel Dumbbells with Rodlike Models
I. Pincus, A. Rodger, J. Ravi Prakash
Rigid macromolecules or polymer chains with persistence length on the order of the contour length (or greater) have traditionally been modelled as rods or very stiff springs. The F…
Computing 3D chromatin configurations from contact probability maps by Inverse Brownian Dynamics
K. Kumari, B. Duenweg, R. Padinhateeri +1
The three-dimensional organization of chromatin, on the length scale of a few genes, is crucial in determining the functional state - accessibility and the amount of gene expressio…
Wet and dry internal friction can be measured with the Jarzynski equality
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
The existence of two types of internal friction wet and dry is revisited, and a simple protocol is proposed for distinguishing between the two types and extracting the appropriate…
Universality of the collapse transition of sticky polymers
Aritra Santra, Kiran Kumari, R. Padinhateeri +2
The universality of the swelling of the radius of gyration of a homopolymer relative to its value in the state, independent of polymer-solvent chemistry, in the crossover regim…
Rheological consequences of wet and dry friction in a dumbbell model with hydrodynamic interactions and internal viscosity
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
The effect of fluctuating internal viscosity and hydrodynamic interactions on a range of rheological properties of dilute polymer solutions is examined using a finitely extensible…
Equilibrium binding energies from fluctuation theorems and force spectroscopy simulations
Emma Hodges, B. M. Cooke, E. M. Sevick +3
Brownian dynamics simulations are used to study the detachment of a particle from a substrate. Although the model is simple and generic, we attempt to map its energy, length and ti…
Size, shape and diffusivity of a single Debye-Hückel polyelectrolyte chain in solution
W. Chamath Soysa, B. Dünweg, J. Ravi Prakash
Brownian dynamics simulations of a coarse-grained bead-spring chain model, with Debye-Hückel electrostatic interactions between the beads, are used to determine the root-mean-squar…
Significance of thermal fluctuations and hydrodynamic interactions in receptor-ligand mediated adhesive dynamics of a spherical particle in wall bound shear flow
K. V. Ramesh, R. Thaokar, J. Ravi Prakash +1
The dynamics of adhesion of a spherical micro-particle to a ligand-coated wall, in shear flow, is studied using a Langevin equation that accounts for thermal fluctuations, hydrodyn…
Dynamic crossover scaling in polymer solutions
Aashish Jain, B. Duenweg, J. Ravi Prakash
The crossover region in the phase diagram of polymer solutions, in the regime above the overlap concentration, is explored by Brownian Dynamics simulations, to map out the universa…
Optimisation of a Brownian dynamics algorithm for semidilute polymer solutions
Aashish Jain, P. Sunthar, B. Dünweg +1
Simulating the static and dynamic properties of semidilute polymer solutions with Brownian dynamics (BD) requires the computation of a large system of polymer chains coupled to one…
Collapse dynamics of copolymers in a poor solvent: Influence of hydrodynamic interactions and chain sequence
Tri Thanh Pham, Burkhard Duenweg, J. Ravi Prakash
We investigate the dynamics of the collapse of a single copolymer chain, when the solvent quality is suddenly quenched from good to poor. We employ Brownian dynamics simulations of…
Implicit and explicit solvent models for the simulation of a single polymer chain in solution: Lattice Boltzmann vs Brownian dynamics
Tri T. Pham, Ulf D. Schiller, J. Ravi Prakash +1
We present a comparative study of two computer simulation methods to obtain static and dynamic properties of dilute polymer solutions. The first approach is a recently established…
Coil-Stretch Transition and the Break Down of Continuum Models
Mohit Bajaj, Matteo Pasquali, J. Ravi Prakash
The breakdown of finite element (FEM) computations for the flow of an Oldroyd-B fluid around a cylinder confined between parallel plates, at Weissenberg numbers Wi = O(1), is shown…
Gaussian approximation for finitely extensible bead-spring chains with hydrodynamic interaction
R. Prabhakar, J. Ravi Prakash
The Gaussian Approximation, proposed originally by Ottinger [J. Chem. Phys., 90 (1) : 463-473, 1989] to account for the influence of fluctuations in hydrodynamic interactions in Ro…
The origin of dynamic scaling in dilute polymer solutions
P. Sunthar, J. Ravi Prakash
The hydrodynamic radius of a polymer chain, obtained using Brownian dynamics simulations of the continuum Edwards model, is found to obey a crossover in the excluded volume paramet…
Universal consequences of the presence of excluded volume interactions in dilute polymer solutions undergoing shear flow
K. Satheesh Kumar, J. Ravi Prakash
The role of solvent quality in determining the universal material properties of dilute polymer solutions undergoing steady simple shear flow is examined. A bead-spring chain repres…
Equilibrium swelling and universal ratios in dilute polymer solutions: Exact Brownian dynamics simulations for a delta function excluded volume potential
K. Satheesh Kumar, J. Ravi Prakash
A narrow Gaussian excluded volume potential, which tends to a delta-function repulsive potential in the limit of a width parameter d* going to zero, has been used to examine the un…