TY  - JOUR
AU  - Belushkin, M.
AU  - Winkler, R.G.
AU  - Foffi, G.
TI  - Role of fluid-density correlations in hydrodynamics: a multiparticle collision dynamics simulation study
JO  - Soft matter
VL  - 8
SN  - 1744-683X
CY  - Cambridge
PB  - Royal Society of Chemistry (RSC)
M1  - PreJuSER-23194
SP  - 9886 - 9891
PY  - 2012
N1  - MB and GF acknowledge the financial support by the Swiss National Science Foundation (grant no. PP0022_119006).
AB  - Hydrodynamic interactions play a pivotal role in the dynamical behaviour of mesoscale systems such as colloidal suspensions, yet isolating their contribution from other effects remains a key challenge. Hydrodynamic correlations within a fluid are a consequence of local momentum conservation. Hence, as is commonly believed, violation of local momentum conservation should lead to non-hydrodynamic behaviour, where long-range correlations in the fluid are absent. Here, we demonstrate that generally this is a necessary but not sufficient criterion to achieve non-hydrodynamic behaviour. The motion of a massive particle leads to density modulations within the fluid. When the mechanisms underlying the relaxation processes of such modulations are removed, the dynamical behaviour of the system becomes unphysical. We show how the density relaxation mechanisms can be reintroduced in multiparticle collision dynamics (MPC) simulations, providing a consistent description of a system without hydrodynamic interactions.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000308661700019
DO  - DOI:10.1039/c2sm26107c
UR  - https://juser.fz-juelich.de/record/23194
ER  -