TY  - JOUR
AU  - Tao, Y.-G.
AU  - Götze, I.O.
AU  - Gompper, G.
TI  - Multiparticle collision dynamics modeling of viscoelastic fluids
JO  - The journal of chemical physics
VL  - 128
SN  - 0021-9606
CY  - Melville, NY
PB  - American Institute of Physics
M1  - PreJuSER-61756
SP  - 144902-1 - 144902-12
PY  - 2008
N1  - Record converted from VDB: 12.11.2012
AB  - In order to investigate the rheological properties of viscoelastic fluids by mesoscopic hydrodynamics methods, we develop a multiparticle collision (MPC) dynamics model for a fluid of harmonic dumbbells. The algorithm consists of alternating streaming and collision steps. The advantage of the harmonic interactions is that the integration of the equations of motion in the streaming step can be performed analytically. Therefore, the algorithm is computationally as efficient as the original MPC algorithm for Newtonian fluids. The collision step is the same as in the original MPC method. All particles are confined between two solid walls moving oppositely, so that both steady and oscillatory shear flows can be investigated. Attractive wall potentials are applied to obtain a nearly uniform density everywhere in the simulation box. We find that both in steady and oscillatory shear flows, a boundary layer develops near the wall, with a higher velocity gradient than in the bulk. The thickness of this layer is proportional to the average dumbbell size. We determine the zero-shear viscosities as a function of the spring constant of the dumbbells and the mean free path. For very high shear rates, a very weak "shear thickening" behavior is observed. Moreover, storage and loss moduli are calculated in oscillatory shear, which show that the viscoelastic properties at low and moderate frequencies are consistent with a Maxwell fluid behavior. We compare our results with a kinetic theory of dumbbells in solution, and generally find good agreement.
KW  - Colloids: chemistry
KW  - Computer Simulation
KW  - Elasticity
KW  - Microfluidics: methods
KW  - Models, Chemical
KW  - Models, Molecular
KW  - Molecular Conformation
KW  - Shear Strength
KW  - Viscosity
KW  - Colloids (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:18412477
UR  - <Go to ISI:>//WOS:000255470300061
DO  - DOI:10.1063/1.2850082
UR  - https://juser.fz-juelich.de/record/61756
ER  -