This title appears in the Scientific Report :
2019
Please use the identifier:
http://hdl.handle.net/2128/23440 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.5126082 in citations.
Hydrodynamic correlations of viscoelastic fluids by multiparticle collision dynamics simulations
Hydrodynamic correlations of viscoelastic fluids by multiparticle collision dynamics simulations
The emergent fluctuating hydrodynamics of a viscoelastic fluid modeled by the multiparticle collision dynamics (MPC) approach is studied. The fluid is composed of flexible, Gaussian phantom polymers that interact by local momentum-conserving stochastic MPCs. For comparison, the analytical solution o...
Saved in:
Personal Name(s): | Toneian, David |
---|---|
Kahl, Gerhard / Gompper, Gerhard (Corresponding author) / Winkler, Roland G. (Corresponding author) | |
Contributing Institute: |
Theorie der Weichen Materie und Biophysik; IAS-2 |
Published in: | The journal of chemical physics, 151 (2019) 19, S. 194110 |
Imprint: |
Melville, NY
American Institute of Physics
2019
|
PubMed ID: |
31757142 |
DOI: |
10.1063/1.5126082 |
Document Type: |
Journal Article |
Research Program: |
Functional Macromolecules and Complexes |
Link: |
Published on 2019-11-20. Available in OpenAccess from 2020-11-20. Published on 2019-11-20. Available in OpenAccess from 2020-11-20. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.5126082 in citations.
The emergent fluctuating hydrodynamics of a viscoelastic fluid modeled by the multiparticle collision dynamics (MPC) approach is studied. The fluid is composed of flexible, Gaussian phantom polymers that interact by local momentum-conserving stochastic MPCs. For comparison, the analytical solution of the linearized Navier-Stokes equation is calculated, where viscoelasticity is taken into account by a time-dependent shear relaxation modulus. The fluid properties are characterized by the transverse velocity autocorrelation function in Fourier space as well as in real space. Various polymer lengths are considered—from dumbbells to (near-)continuous polymers. Viscoelasticity affects the fluid properties and leads to strong correlations, which overall decay exponentially in Fourier space. In real space, the center-of-mass velocity autocorrelation function of individual polymers exhibits a long-time tail, independent of the polymer length, which decays as t−3/2, similar to a Newtonian fluid, in the asymptotic limit t → ∞. Moreover, for long polymers, an additional power-law decay appears at time scales shorter than the longest polymer relaxation time with the same time dependence, but negative correlations, and the polymer length dependence L−1/2. Good agreement is found between the analytical and simulation results |