scholarly journals Confined dynamics of a single DNA molecule

2011 ◽  
Vol 369 (1944) ◽  
pp. 2329-2336 ◽  
Author(s):  
M. Chinappi ◽  
E. De Angelis
Keyword(s):  
Mesoscale Model ◽  
Tangential Direction ◽  
Particle Collision ◽  
Navier Stokes ◽  
Gyration Radius ◽  
Channel Height ◽  
Collision Dynamics ◽  
Relaxation Dynamics ◽  
Confined Dynamics ◽  
Single Dna Molecule

The effect of a slit-like confinement on the relaxation dynamics of DNA is studied via a mesoscale model in which a bead and spring model for the polymer is coupled to a particle-based Navier–Stokes solver (multi-particle collision dynamics). The confinement is found to affect the equilibrium stretch of the chain when the bulk gyration radius is comparable to or smaller than the channel height and our data are in agreement with the ( R g,bulk / h ) 1/4 scaling of the polymer extension in the wall tangential direction. Relaxation simulation at different confinements indicates that, while the overall behaviour of the relaxation dynamics is similar for low and strong confinements, a small, but significant, slowing of the far-equilibrium relaxation is found as the confinement increases.

scholarly journals A numerical study on droplet-particle collision dynamics

2016 ◽  
Vol 61 ◽  
pp. 499-509 ◽  
Author(s):  
Ilias Malgarinos ◽  
Nikolaos Nikolopoulos ◽  
Manolis Gavaises
Keyword(s):  
Numerical Study ◽  
Particle Collision ◽  
Collision Dynamics

scholarly journals Multiscale Simulation of Non-Metallic Inclusion Aggregation in a Fully Resolved Bubble Swarm in Liquid Steel

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 517
Author(s):  
Jean-Sébastien Kroll-Rabotin ◽  
Matthieu Gisselbrecht ◽  
Bernhard Ott ◽  
Ronja May ◽  
Jochen Fröhlich ◽  
...  
Keyword(s):  
Particle Size ◽  
Shear Flow ◽  
Initial Conditions ◽  
Bubbly Flow ◽  
Multiscale Simulation ◽  
Particle Collision ◽  
Immersed Boundary ◽  
Collision Dynamics ◽  
Plane Shear ◽  
Boltzmann Method

Removing inclusions from the melt is an important task in metallurgy with critical impact on the quality of the final alloy. Processes employed with this purpose, such as flotation, crucially depend on the particle size. For small inclusions, the aggregation kinetics constitute the bottleneck and, hence, determine the efficiency of the entire process. If particles smaller than all flow scales are considered, the flow can locally be replaced by a plane shear flow. In this contribution, particle interactions in plane shear flow are investigated, computing the fully resolved hydrodynamics at finite Reynolds numbers, using a lattice Boltzmann method with an immersed boundary method. Investigations with various initial conditions, several shear values and several inclusion sizes are conducted to determine collision efficiencies. It is observed that although finite Reynolds hydrodynamics play a significant role in particle collision, statistical collision efficiency barely depends on the Reynolds number. Indeed, the particle size ratio is found to be the prevalent parameter. In a second step, modeled collision dynamics are applied to particles tracked in a fully resolved bubbly flow, and collision frequencies at larger flow scale are derived.

Defects around nanocolloids in nematic solvents simulated by Multi-particle Collision Dynamics

2020 ◽  
Vol 547 ◽  
pp. 123862 ◽  
Author(s):  
Denisse Reyes-Arango ◽  
Jacqueline Quintana-H. ◽  
Julio C. Armas-Pérez ◽  
Humberto Híjar
Keyword(s):  
Particle Collision ◽  
Collision Dynamics

Simulation of complex fluids by multi-particle-collision dynamics

2005 ◽  
Vol 169 (1-3) ◽  
pp. 326-330 ◽  
Author(s):  
R.G. Winkler ◽  
M. Ripoll ◽  
K. Mussawisade ◽  
G. Gompper
Keyword(s):  
Complex Fluids ◽  
Particle Collision ◽  
Collision Dynamics

Experimental measurements of particle collision dynamics in a pseudo-2D gas-solid fluidized bed

2017 ◽  
Vol 167 ◽  
pp. 297-316 ◽  
Author(s):  
Zhaochen Jiang ◽  
Thomas Hagemeier ◽  
Andreas Bück ◽  
Evangelos Tsotsas
Keyword(s):  
Fluidized Bed ◽  
Particle Collision ◽  
Experimental Measurements ◽  
Collision Dynamics

Development of Numerical Code to Predict Three-Dimensional Sand Erosion Phenomena

2003 ◽  
Author(s):  
Kuki Junichi ◽  
Kazuyuki Toda ◽  
Makoto Yamamoto
Keyword(s):  
Flow Field ◽  
Stokes Equations ◽  
Suspended Particle ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Numerical Code ◽  
Particle Collision ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Sand Erosion

This paper presents a numerical procedure to predict a three-dimensional sand erosion phenomenon and the interaction between the flow field and the eroded surface. To simulate this phenomenon, the turbulent flow field, the particle trajectory and the amount of erosion on the eroded wall are calculated repeatedly. In computations of the flow field, compressible Navier-Stokes equations and low-Reynolds-number type k–ε turbulence model are adopted. Assuming that the concentration of suspended particle is dilute, particle-particle collision and the influence of particle motions on the flow field are neglected. The Neilson-Gilchrist erosion model is used to estimate the weight loss due to erosion. To verify the developed code, two types of 90-degree bends are computed. The results show that the present procedure can reasonably reproduce the sand erosion process and the temporal change of both the flow field and the wall surface qualitatively.

Numerical Investigation on Wavy Streak Formation Due to Sand Erosion

2005 ◽  
Author(s):  
Masaya Suzuki ◽  
Kazuyuki Toda ◽  
Makoto Yamamoto
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
Stokes Equations ◽  
Numerical Procedure ◽  
Particle Collision ◽  
Navier Stokes ◽  
Two Phase ◽  
Sand Erosion ◽  
Wall Deformation ◽  
Turbulent Flow Field

It is well known that sand erosion is a typical multi-physic problem, that is, the interactions among flow field, particle motions and wall deformation are important. To simulate this phenomenon, turbulent flow field, particle trajectories and amount of erosion on an eroded wall are calculated repeatedly. In the computations of the flow field, compressible Navier-Stokes equations and low-Reynolds-number type k-ε turbulence model are adopted. Assuming that the concentration of suspended particles is dilute, particle-particle collision and the influence of particle motions on the flow field are neglected. The Neilson-Gilchrist erosion model is used to estimate the weight loss due to erosion. Based on this numerical procedure, the gas-particle two-phase turbulent flow field in 90-degree bend with a square cross-section is simulated, in order to clarify erosion pattern formation by fluid/particle/wall interaction.

On the Dynamics of Particle-Particle Interaction

Tribology ◽  
2005 ◽  
Author(s):  
W. Cheng ◽  
K. Farhang ◽  
Y. Kwon
Keyword(s):  
Particle System ◽  
Particle Interaction ◽  
Viscoelastic Model ◽  
Approximate Equation ◽  
Conservative System ◽  
Particle Collision ◽  
Elastic Model ◽  
Collision Dynamics ◽  
Interacting Particles ◽  
Jkr Theory

In numerous engineering and science applications understanding the dynamic behavior of two interacting particles plays an indispensable role as it is the foundation based upon which the behavior of a large number of particles may be predicted. When two particles interact, two prominent forces of adhesion and elasticity are at work and, in some respect, in competition. This is especially true when particle-particle collision dynamics is of interest. Upon collision, two particles either develop physical bond, coalesce to form an agglomeration or rebound, each following a distinct path. A promising theory to address particle-particle collision dynamics is due to Johnson, Kendal and Roberts [1] referred to as the JKR method. However, JKR suffers from two main shortcomings in application to particle dynamics. These are (1) implicit relations between force and displacement and (2) representation of a two-particle system as a conservative system. These shortcomings were treated in [2] by first deriving a highly accurate approximate equation based on the JKR theory in which force and displacement are explicitly related and the extension of the JKR theory wherein the Kelving-Voigt viscoelastic model is used instead of the elastic model. This formulation provides an opportunity to study particle-particle collision dynamics, which is the study in the present paper.

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