Arbitrary flow boundary conditions in smoothed dissipative particle dynamics: A generalized virtual rheometer

2021 ◽  
Vol 33 (1) ◽  
pp. 012006
Author(s):  
N. Moreno ◽  
M. Ellero
Keyword(s):  
Boundary Conditions ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Flow Boundary ◽  
Arbitrary Flow

scholarly journals Forced Convection Heat Transfer Simulation Using Dissipative Particle Dynamics With Energy Conservation

2011 ◽  
Author(s):  
Toru Yamada ◽  
Anurag Kumar ◽  
Yutaka Asako ◽  
Mohammad Faghri
Keyword(s):  
Heat Flux ◽  
Energy Conservation ◽  
Boundary Conditions ◽  
Forced Convection ◽  
Flow Direction ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Coarse Grained ◽  
Channel Cross Section ◽  
Difference Approximation

Dissipative particle dynamics (DPD) with energy conservation was applied to simulate forced convection in parallel-plate channels with boundary conditions of constant wall temperature (CWT) and constant wall heat flux (CHF). DPD is a coarse-grained version of molecular dynamics. An additional governing equation for energy conservation was solved along with conventional DPD equations where inter-particle heat flux accounts for changes in mechanical and internal energies when particles interact with surrounding particles. The solution domain was considered to be two-dimensional with periodic boundary condition in the flow direction. Additional layers of particles on top and bottom of the channel were utilized to apply no-slip velocity and temperature boundary conditions. The governing equations for energy conservation were modified based on periodic fully developed velocity and temperature conditions. The results were shown via velocity and temperature profiles across the channel cross section. The Nusselt numbers were calculated from the temperature gradient at the wall using a second order accurate forward difference approximation. The results agreed well with the exact solutions to within 2.3%.

Boundary conditions in dissipative particle dynamics

1999 ◽  
Vol 121-122 ◽  
pp. 309-311 ◽  
Author(s):  
M. Revenga ◽  
I. Zúñiga ◽  
P. Español
Keyword(s):  
Boundary Conditions ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics

Extendable outflow boundary conditions for dissipative particle dynamics simulation

2017 ◽  
Vol 28 (06) ◽  
pp. 1750071
Author(s):  
Z. G. Huang ◽  
T. M. Yue ◽  
Y. Deng ◽  
Z. N. Guo
Keyword(s):  
Boundary Conditions ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Dynamics Simulation ◽  
Navier Stokes ◽  
Boundary Method ◽  
Outflow Boundary Condition ◽  
Outflow Rate ◽  
The Stability ◽  
Outflow Boundary

This paper presents a systematic study on a basic kind of outflow boundary condition for Dissipative Particle Dynamics (DPD) simulation, in which the flow near the outlet can be assumed as fully developed. The boundary conditions are expressed in Neumann-type constraints due to the zero gradients of hydrodynamic quantities on the boundary. The flow rate is included as an additional constraint to ensure the stability of a simulation. The boundary conditions are imposed through a reservoir, which is a replica of the simulation domain in the vicinity of the outlet. All the particle configurations are conserved in the reservoir. A velocity adjusting scheme is developed for the reservoir in order to control the deviation of the outflow rate and to remove the pressure discontinuity across the boundary. The effectiveness of the boundary method is examined through the simulations of a uniform flow and a laminar flow in a bifurcated tunnel. The outflow rates, as well as the velocity profile and pressure distribution, all agree well with the Navier–Stokes solution by comparison. The assumption of the fully developed outflow is validated by measuring the gradients of the flow rates. It is expected that this boundary method can be used in the simulation of flows with heterogeneous particle distribution, without having to evaluate the distribution function in advance.

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