SIMULATION OF THE ALCOHOL-OIL MIXTURE IN A T-SHAPED MICROCHANNEL USING THE DISSIPATIVE PARTICLE DYNAMICS METHOD ON GPU DEVICES

2014 ◽  
Vol 13 (1) ◽  
pp. 65
Author(s):  
A. A. Horta ◽  
L. O. S. Ferreira ◽  
E. L. Martinez ◽  
R. Maciel Filho
Keyword(s):  
Dissipative Particle Dynamics ◽  
Fluid Motion ◽  
Particle Dynamics ◽  
Immiscible Fluids ◽  
Biodiesel Production ◽  
Model Parameters ◽  
Processing Unit ◽  
Fluid Properties ◽  
Practical Engineering ◽  
Multiphase Fluid

Multiphase fluid motion in microchannnels involves complicated fluid dynamics and is fundamentally important to diverse practical engineering applications. Among several applications, the alcohol-oil mixture is particularly important due to its application for biodiesel production. In this work, the mixture of immiscible fluids alcohol-oil in a square T-shaped microchannel was investigated using the Dissipative Particle Dynamics (DPD) method available in the HOOMD simulator, which runs on a single graphic processing unit (GPU). The immiscible fluids were achieved by increasing the repulsive force between species. The fluid properties and hydrodynamic behavior were discussed in function of model parameters. The simulation results agree with data published in the literature showing that the DPD is appropriate for simulation of mass transport on complex geometries in microscale on a single GPU.

MIXING DRIVEN BY RAYLEIGH–TAYLOR INSTABILITY IN THE MESOSCALE MODELED WITH DISSIPATIVE PARTICLE DYNAMICS

2001 ◽  
Vol 12 (01) ◽  
pp. 91-118 ◽  
Author(s):  
WITOLD DZWINEL ◽  
DAVID A. YUEN
Keyword(s):  
Capillary Number ◽  
Large Scale ◽  
Dominant Role ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Feedback Mechanism ◽  
Immiscible Fluids ◽  
Macroscopic Models ◽  
Highly Nonlinear ◽  
Mixing Dynamics

In the mesoscale, mixing dynamics involving immiscible fluids is truly an outstanding problem in many fields, ranging from biology to geology, because of the multiscale nature which causes severe difficulties for conventional methods using partial differential equations. The existing macroscopic models incorporating the two microstructural mechanisms of breakup and coalescence do not have the necessary physical ingredients for feedback dynamics. We demonstrate here that the approach of dissipative particle dynamics (DPD) does include the feedback mechanism and thus can yield much deeper insight into the nature of immiscible mixing. We have employed the DPD method for simulating numerically the highly nonlinear aspects of the Rayleigh–Taylor (R–T) instability developed over the mesoscale for viscous, immiscible, elastically compressible fluids. In the initial stages, we encounter the spontaneous, vertical oscillations in the incipient period of mixing. The long-term dynamics are controlled by the initial breakup and the subsequent coalescence of the microstructures and the termination of the chaotic stage in the development of the R–T instability. In the regime with high capillary number, breakup plays a dominant role in the mixing whereas in the low capillary number regime, the flow decelerates and coalescence takes over and causes a more rapid turnover. The speed of mixing and the turnover depend on the immiscibility factor which results from microscopic interactions between the binary fluid components. Both the speed of mixing and the overturn dynamics depend not only on the mascrocopic fluid properties but also on the breakup and coalescent patterns, and most importantly on the nonlinear interactions between the microstructural dynamics and the large-scale flow.

scholarly journals Accelerating dissipative particle dynamics with graphic processing unit

2014 ◽  
Vol 63 (10) ◽  
pp. 104702
Author(s):  
Lin Chen-Sen ◽  
Chen Shuo ◽  
Li Qi-Liang ◽  
Yang Zhi-Gang
Keyword(s):  
Graphic Processing Unit ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Processing Unit ◽  
Graphic Processing

Microhydrodynamics with Dissipative Particle Dynamics

1995 ◽  
Vol 407 ◽  
Author(s):  
Pep Español ◽  
Ignacio Zúñiga
Keyword(s):  
Simple Model ◽  
Molecular Dynamic Simulation ◽  
Dynamic Simulation ◽  
Theoretical Foundation ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Coarse Grained ◽  
Model Parameters ◽  
Hydrodynamic Properties ◽  
Insight Into

ABSTRACTDissipative particle dynamics is essentially a coarse-grained molecular dynamic simulation technique that captures the essential physics with considerably less computer effort. We have given a sound theoretical foundation to the technique with respect to the equilibrium and hydrodynamic properties. In this paper we further explore the connection of the model parameters of DPD with the underlying microscopic dynamics for the case of a simple model of a solid. This provides some insight into the difficulties of interpretation of DPD simulations.

Using Dissipative Particle Dynamics to Model Binary Immiscible Fluids

1997 ◽  
Vol 08 (04) ◽  
pp. 909-918 ◽  
Author(s):  
Keir E. Novik ◽  
Peter V. Coveney
Keyword(s):  
Phase Separation ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Immiscible Fluids ◽  
Promising Method ◽  
Domain Growth ◽  
Immiscible Fluid ◽  
Two Dimensional ◽  
Fluid Systems

We investigate the domain growth and phase separation of two-dimensional binary immiscible fluid systems using dissipative particle dynamics. Our results are compared with similar simulations using other techniques, and we conclude that dissipative particle dynamics is a promising method for simulating these systems.

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