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Polymers 2018, 10(11), 1224; https://doi.org/10.3390/polym10111224

Thinning Approximation for Calculating Two-Dimensional Scattering Patterns in Dissipative Particle Dynamics Simulations under Shear Flow

1
Department of Applied Physics, National Defense Academy, Yokosuka 239-8686, Japan
2
Department of Physics, Tohoku University, Sendai 980-8578, Japan
3
Department of Creative Engineering, Tsuruoka College, National Institute of Technology, Yamagata 997-8511, Japan
*
Author to whom correspondence should be addressed.
Received: 5 October 2018 / Revised: 26 October 2018 / Accepted: 1 November 2018 / Published: 3 November 2018
(This article belongs to the Special Issue Simulations of Polymers)
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Abstract

Modifications to improve thinning approximation (TA) were considered in order to calculate two-dimensional scattering patterns (2DSPs) for dissipative particle dynamics (DPD) simulations of polymer melts under a shear flow. We proposed multipoint TA and adaptive TA because the bond lengths in DPD chains vary widely when compared to those in Kremer–Grest (KG) chains, and the effectiveness of these two types of TA for the two major DPD parameter sets were investigated. In this paper, we report our findings on the original DPD model with soft bonds and that with rigid bonds. Based on the behavior of the 2DSPs and the distribution of orientations of the bond vectors, two spot patterns originating from the oriented chain correlations were observed when distinct distributions of the highly oriented bond vectors in the shear direction were obtained. For multipoint TA, we concluded that at least two additional midpoints ( n mid 2 ) are required to clearly observe the two spot patterns. For adaptive TA, a dividing distance of l ATA 0.4 is sufficient for clear observation, which is consistent with the requirement of n mid 2 for multipoint TA. View Full-Text
Keywords: dissipative particle dynamics (DPD) simulations; two-dimensional scattering patterns (2DSPs); thinning approximation (TA); shear deformation dissipative particle dynamics (DPD) simulations; two-dimensional scattering patterns (2DSPs); thinning approximation (TA); shear deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hagita, K.; Murashima, T.; Iwaoka, N. Thinning Approximation for Calculating Two-Dimensional Scattering Patterns in Dissipative Particle Dynamics Simulations under Shear Flow. Polymers 2018, 10, 1224.

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