scholarly journals Hybrid fluid–particle modeling of shock-driven hydrodynamic instabilities in a plasma

2021 ◽  
Vol 6 (3) ◽  
pp. 035901
Author(s):  
Hong-bo Cai ◽  
Xin-xin Yan ◽  
Pei-lin Yao ◽  
Shao-ping Zhu
Keyword(s):  
Fluid Particle ◽  
Hydrodynamic Instabilities ◽  
Particle Modeling ◽  
Hybrid Fluid

scholarly journals A Penalty Method to Model Particle Interactions in DNA-Laden Flows

2008 ◽  
Vol 8 (7) ◽  
pp. 3749-3756
Author(s):  
D. Trebotich ◽  
G. H. Miller ◽  
M. D. Bybee
Keyword(s):  
Packed Bed ◽  
Thermal Fluctuations ◽  
Fluid Particle ◽  
Hydrodynamic Drag ◽  
Physical Parameters ◽  
Particle Interactions ◽  
Flow And Transport ◽  
A Chain ◽  
Hybrid Fluid ◽  
Geometric Variation

We present a hybrid fluid-particle algorithm to simulate flow and transport of DNA-laden fluids in microdevices. Relevant length scales in microfluidic systems range from characteristic channel sizes of millimeters to micron scale geometric variation (e.g., post arrays) to 10 nanometers for the length of a single rod in a bead-rod polymer representation of a biological material such as DNA. The method is based on a previous fluid-particle algorithm in which long molecules are represented as a chain of connected rods, but in which the physically unrealistic behavior of rod crossing occurred. We have extended this algorithm to include screened Coulombic forces between particles by implementing a Debye-Hückel potential acting between rods. In the method an unsteady incompressible Newtonian fluid is discretized with a second-order finite difference method in the interior of the Cartesian grid domain; an embedded boundary volume-of-fluid formulation is used near boundaries. The bead-rod polymer model is fully coupled to the solvent through body forces representing hydrodynamic drag and stochastic thermal fluctuations. While intra-polymer interactions are modeled by a soft potential, polymer-structure interactions are treated as perfectly elastic collisions. We demonstrate this method on flow and transport of a polymer through a post array microchannel in 2D where the polymer incorporates more realistic physical parameters of DNA, and compare to previous simulations where rods are allowed to cross. We also show that the method is capable of simulating 3D flow in a packed bed micro-column.

Coupled fluid-particle modeling of a slot die coating system

AIChE Journal ◽  
2016 ◽  
Vol 62 (6) ◽  
pp. 1933-1939 ◽  
Author(s):  
V. Akbarzadeh ◽  
A. N. Hrymak
Keyword(s):  
Fluid Particle ◽  
Coating System ◽  
Slot Die Coating ◽  
Particle Modeling ◽  
Slot Die

Hydrodynamic Instabilities

2009 ◽  
Author(s):  
Francois Charru ◽  
Patricia de Forcrand-Millard
Keyword(s):  
Hydrodynamic Instabilities
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