Numerical study of polymer tumbling in linear shear flows
arXiv:nlin/0509002 · doi:10.1016/j.physd.2005.07.016
Abstract
We investigate numerically the dynamics of a single polymer in a linear shear flow. The effects of thermal fluctuations and randomly fluctuating velocity gradients are both analyzed. Angular, elongation and tumbling time statistics are measured numerically. We perform analytical calculations and numerical simulations for a linear single-dumbbell polymer model comparing the results with previous theoretical and experimental studies. For thermally driven polymers the balance between relaxation and thermal fluctuations plays a fundamental role, whereas for random velocity gradients the ratio between the intensity of the random part and the mean shear is the most relevant quantity. In the low-noise limit, many universal aspects of the motion of a polymer in a shear flow can be understood in this simplified framework.
12 pages, 17 figures, accepted to Physica D
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- Dynamical Slowdown of Polymers in Laminar and Random Flows
- Tumbling motion of a single chain in shear flow: a crossover from Brownian to non-Brownian behavior
- Dynamics and Scission of Rodlike Cationic Surfactant Micelles in Shear Flow
- Orientation of non-spherical particles in an axisymmetric random flow
- Accurate statistics of a flexible polymer chain in shear flow
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- Dynamics of flexible filaments in oscillatory shear flows
- Spherical Ornstein-Uhlenbeck processes
- Single polymer dynamics in elongational flow and the confluent Heun equation
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- Polymer rheology simulations at the meso- and macroscopic scale
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- Two-dimensional active polar semiflexible polymer under shear flow