Pham, TT;
Schiller, UD;
Prakash, JR;
Dünweg, B;
(2009)
Implicit and explicit solvent models for the simulation of a single polymer chain in solution: Lattice Boltzmann versus Brownian dynamics.
Journal of Chemical Physics
, 131
(16)
, Article 164114. 10.1063/1.3251771.
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Abstract
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 hybrid algorithm based on dissipative coupling between molecular dynamics and lattice Boltzmann (LB), while the second is standard Brownian dynamics (BD) with fluctuating hydrodynamic interactions. Applying these methods to the same physical system (a single polymer chain in a good solvent in thermal equilibrium) allows us to draw a detailed and quantitative comparison in terms of both accuracy and efficiency. It is found that the static conformations of the LB model are distorted when the box length L is too small compared to the chain size. Furthermore, some dynamic properties of the LB model are subject to an L(-1) finite-size effect, while the BD model directly reproduces the asymptotic L-->infinity behavior. Apart from these finite-size effects, it is also found that in order to obtain the correct dynamic properties for the LB simulations, it is crucial to properly thermalize all the kinetic modes. Only in this case, the results are in excellent agreement with each other, as expected. Moreover, Brownian dynamics is found to be much more efficient than lattice Boltzmann as long as the degree of polymerization is not excessively large.
Type: | Article |
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Title: | Implicit and explicit solvent models for the simulation of a single polymer chain in solution: Lattice Boltzmann versus Brownian dynamics |
Location: | United States |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1063/1.3251771 |
Publisher version: | http://dx.doi.org/10.1063/1.3251771 |
Language: | English |
Additional information: | © 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (Pham, TT; Schiller, UD; Prakash, JR; Dünweg, B; (2009) Implicit and explicit solvent models for the simulation of a single polymer chain in solution: Lattice Boltzmann versus Brownian dynamics. Journal of Chemical Physics , 131 (16) , Article 164114 and may be found at http://dx.doi.org/10.1063/1.3251771. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/1460211 |
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