scholarly journals Particle simulation algorithms with short-range forces in MHD and fluid flow

1992 ◽  
Author(s):  
S. Cable ◽  
T. Tajima ◽  
K. Umegaki
Keyword(s):  
Fluid Flow ◽  
Short Range ◽  
Particle Simulation ◽  
Simulation Algorithms

Numerical Investigation of Fiber Flocculation in the Air Flow of an Asymmetric Diffuser

2014 ◽  
Author(s):  
Jelena Andric ◽  
Stefan B. Lindström ◽  
Srdjan Sasic ◽  
Håkan Nilsson
Keyword(s):  
Fluid Flow ◽  
Short Range ◽  
Stokes Equations ◽  
Equations Of Motion ◽  
Navier Stokes ◽  
Forming Process ◽  
Navier Stokes Equations ◽  
Flow Fluctuations ◽  
Dry Forming ◽  
Particle Level

A particle-level rigid fiber model is used to study flocculation in an asymmetric planar diffuser with a turbulent Newtonian fluid flow, resembling one stage in dry-forming process of pulp mats. The fibers are modeled as chains of rigid cylindrical segments. The equations of motion incorporate hydrodynamic forces and torques from the interaction with the fluid, and the fiber inertia is taken into account. The flow is governed by the Reynolds-averaged Navier–Stokes equations with the standard k–ω turbulence model. A one-way coupling between the fibers and the flow is considered. A stochastic model is employed for the flow fluctuations to capture the fiber dispersion. The fibers are assumed to interact through short-range attractive forces, causing them to interlock as the fiber-fiber contacts occur during the flow. It is found that the formation of fiber flocs is driven by both the turbulence-induced dispersion and the gradient of the averaged flow field.

scholarly journals Time-Step Considerations in Particle Simulation Algorithms for Coulomb Collisions in Plasmas

2010 ◽  
Vol 38 (9) ◽  
pp. 2394-2406 ◽  
Author(s):  
Bruce I. Cohen ◽  
Andris M. Dimits ◽  
Alex Friedman ◽  
Russel E. Caflisch
Keyword(s):  
Particle Simulation ◽  
Time Step ◽  
Coulomb Collisions ◽  
Simulation Algorithms
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