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Transient-time correlation function applied to mixed shear and elongational flows

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posted on 2024-07-09, 14:08 authored by Remco Hartkamp, Stefano Bernardi, Billy ToddBilly Todd
The transient-time correlation function (TTCF) method is used to calculate the nonlinear response of a homogeneous atomic fluid close to equilibrium. The TTCF response of the pressure tensor subjected to a time-independent planar mixed flow of shear and elongation is compared to directly averaged non-equilibrium molecular dynamics (NEMD) simulations. We discuss the consequence of noise in simulations with a small rate of deformation. The generalized viscosity for planar mixed flow is also calculated with TTCF. We find that for small rates of deformation, TTCF is far more efficient than direct averages of NEMD simulations. Therefore, TTCF can be applied to fluids with deformation rates which are much smaller than those commonly used in NEMD simulations. Ultimately, TTCF applied to molecular systems is amenable to direct comparison between NEMD simulations and experiments and so in principle can be used to study the rheology of polymer melts in industrial processes.

Funding

Technology Foundation STW

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ISSN

0021-9606

Journal title

Journal of Chemical Physics

Volume

136

Issue

6

Article number

article no. 064105

Pagination

064105-

Publisher

American Institute of Physics

Copyright statement

Copyright © 2012 American Institute of Physics. The published version is reproduced with the permission of the publisher.

Language

eng

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