Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.2360421
Title: Flow around spheres by dissipative particle dynamics
Authors: Chen, S.
Phan-Thien, N. 
Khoo, B.C. 
Fan, X.J.
Keywords: Boundary layers
Drag
External flows
Laminar flow
Pipe flow
Shear flow
Two-phase flow
Issue Date: Oct-2006
Source: Chen, S., Phan-Thien, N., Khoo, B.C., Fan, X.J. (2006-10). Flow around spheres by dissipative particle dynamics. Physics of Fluids 18 (10) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.2360421
Abstract: The dissipative particle dynamics (DPD) method is used to study the flow behavior past a sphere. The sphere is represented by frozen DPD particles while the surrounding fluids are modeled by simple DPD particles (representing a Newtonian fluid). For the surface of the sphere, the conventional model without special treatment and the model with specular reflection boundary condition proposed by Revenga [Comput. Phys. Commun. 121-122, 309 (1999)] are compared. Various computational domains, in which the sphere is held stationary at the center, are investigated to gage the effects of periodic conditions and walls for Reynolds number (Re)=0.5 and 50. Two types of flow conditions, uniform flow and shear flow are considered, respectively, to study the drag force and torque acting on the stationary sphere. It is found that the calculated drag force imposed on the sphere based on the model with specular reflection is slightly lower than the conventional model without special treatment. With the conventional model the drag force acting on the sphere is in better agreement with experimental correlation obtained by Brown and Lawler [J. Environ. Eng. 129, 222 (2003)] for the case of larger radius up to Re of about 5. The computed torque also approaches the analytical Stokes value when Re<1. For a force-free and torque-free sphere, its motion in the flow is captured by solving the translational and rotational equations of motion. The effects of different DPD parameters (a, γ, and σ) on the drag force and torque are studied. It shows that the dissipative coefficient (γ) mainly affects the drag force and torque, while random and conservative coefficient have little influence on them. Furthermore the settling of a single sphere in square tube is investigated, in which the wall effect is considered. Good agreement is found with the experiments of Miyamura [Int. J. Multiphase Flow 7, 31 (1981)] and lattice-Boltzmann simulation results of Aidun [J. Fluid Mech. 373, 287 (1998)]. © 2006 American Institute of Physics.
Source Title: Physics of Fluids
URI: http://scholarbank.nus.edu.sg/handle/10635/60341
ISSN: 10706631
DOI: 10.1063/1.2360421
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

58
checked on Dec 6, 2017

WEB OF SCIENCETM
Citations

53
checked on Nov 22, 2017

Page view(s)

41
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.