A spring model for suspended particles in dissipative particle dynamics

Phan-Thien, N. and Mai-Duy, N. and Khoo, B. C. (2014) A spring model for suspended particles in dissipative particle dynamics. Journal of Rheology, 58 (4). pp. 839-867. ISSN 0148-6055

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Abstract

This paper is concerned with the use of oscillating particles instead of the usual frozen particles to model a suspended particle in the Dissipative Particle Dynamics (DPD) method. A suspended particle is represented by a set of basic DPD particles connected to reference sites by linear springs of very large stiffness. The reference sites, collectively modelling a rigid body, move as a rigid body motion calculated through their Newton-Euler equations, using data from the previous time step, while the velocities of their associated DPD particles are found by solving the DPD equations at the current time step.
In this way, a specified Boltzmann temperature (specific kinetic energy of the particles) can be maintained throughout the computational domain, including the region occupied by the suspended particles. This parameter can also be used to adjust the size of the suspended and solvent particles, which in turn affect the strength of the shear-thinning behaviour and the effective maximal packing fraction. Furthermore, the suspension, comprised of suspended particles in a set of solvent particles all interacting under a quadratic soft repulsive potential, can be simulated using a relatively large time step. Several numerical examples are presented to demonstrate attractiveness of the proposed model.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publihser copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 03 Dec 2014 04:28
Last Modified: 23 Jan 2018 06:06
Uncontrolled Keywords: dissipative particle dynamics, particulate suspensions, spring model, soft potential, thermodynamic temperature, reduced viscosity, particle migration
Fields of Research : 01 Mathematical Sciences > 0102 Applied Mathematics > 010207 Theoretical and Applied Mechanics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970101 Expanding Knowledge in the Mathematical Sciences
Identification Number or DOI: 10.1122/1.4874679
URI: http://eprints.usq.edu.au/id/eprint/26365

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