Resolution Effects in Dissipative Particle Dynamics Simulations

Edo S. Boek () and Paul Van Der Schoot ()
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Edo S. Boek: Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge CB3 0EL, United Kingdom
Paul Van Der Schoot: Max Planck Institute for Colloids and Interfaces, Kantstrasse 55, D-14513 Teltow-Seehof, Germany

International Journal of Modern Physics C (IJMPC), 1998, vol. 09, issue 08, 1307-1318

Abstract: Dissipative Particle Dynamics (DPD) simulations were performed to investigate resolution or "coarse graining" effects on the simulation results. Fluid flow through a periodic array of spheres has been studied as a model for fluid filtration into a porous medium. In our model system, it appears that quantitatively correct results for the dimensionless drag can be obtained for relatively small system sizes. For higher solid volume fractions, it is necessary to increase the system size to avoid finite size and resolution effects. Simulations of colloidal spheres suspended in a DPD fluid show effective attraction between the large colloid particles, causing depletion aggregation. This effect may be expected as a consequence of the coarse-grained nature of the DPD fluid. By imposing a steady shear rate the aggregation can be suppressed. The results show that for dilute suspensions, the Brownian noise in the particle interactions causes an effective colloid polydispersity, which suppresses aggregation effects.

Keywords: Dissipative Particle Dynamics (DPD); Mesoscopic Simulation; Coarse Graining; Finite Size Effects; Colloidal Suspensions; Porous Media; Depletion Aggregation (search for similar items in EconPapers)
Date: 1998
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DOI: 10.1142/S0129183198001187

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