Journal Article

PreJuSER-23194

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of fluid-density correlations in hydrodynamics: a multiparticle collision dynamics simulation study

Belushkin, M.FZJ* ; Winkler, R. G.FZJ* ; Foffi, G.FZJ*

2012
Royal Society of Chemistry (RSC) Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/7616  doi:10.1039/C2SM26107C

Abstract: 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.

Keyword(s): J

Note: MB and GF acknowledge the financial support by the Swiss National Science Foundation (grant no. PP0022_119006).

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Contributing Institute(s):

1. Theorie der weichen Materie und Biophysik (ICS-2)
2. Theorie der Weichen Materie und Biophysik (IAS-2)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)

Appears in the scientific report 2012

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Database coverage:
; ; Allianz-Lizenz / DFG ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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