Simulation of Vortex Flows for Airplanes in Ground Operations

2006 ◽  
Author(s):  
Yoram Yadlin ◽  
Arvin Shmilovich
Keyword(s):  
Vortex Flows

VORTEX FLOWS OF A MICROPOLAR FLUID

2010 ◽  
Vol 41 (4) ◽  
pp. 437-449 ◽  
Author(s):  
M. A. Brutyan ◽  
V. E. Kovalev
Keyword(s):  
Micropolar Fluid ◽  
Vortex Flows

scholarly journals Numerical Analysis of Air Vortex Interaction with Porous Screen

Fluids ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 70
Author(s):  
Xudong An ◽  
Lin Jiang ◽  
Fatemeh Hassanipour
Keyword(s):  
Physical Properties ◽  
Vortex Ring ◽  
Numerical Study ◽  
Flow Behavior ◽  
Industrial Applications ◽  
Moving Mesh ◽  
Vortex Flows ◽  
Vortex Interaction ◽  
Piston Cylinder ◽  
Porous Screen

In many industrial applications, a permeable mesh (porous screen) is used to control the unsteady (most commonly vortex) flows. Vortex flows are known to display intriguing behavior while propagating through porous screens. This numerical study aims to investigate the effects of physical properties such as porosity, Reynolds number, inlet flow dimension, and distance to the screen on the flow behavior. The simulation model includes a piston-cylinder vortex ring generator and a permeable mesh constructed by evenly arranged rods. Two methods of user-defined function and moving mesh have been applied to model the vortex ring generation. The results show the formation, evolution, and characteristics of the vortical rings under various conditions. The results for vorticity contours and the kinetic energy dissipation indicate that the physical properties alter the flow behavior in various ways while propagating through the porous screens. The numerical model, cross-validated with the experimental results, provides a better understanding of the fluid–solid interactions of vortex flows and porous screens.

Flow structures and wave-number selection in spiraling vortex flows

1985 ◽  
Vol 32 (1) ◽  
pp. 655-658 ◽  
Author(s):  
S. Zaleski ◽  
P. Tabeling ◽  
P. Lallemand
Keyword(s):  
Wave Number ◽  
Flow Structures ◽  
Vortex Flows

scholarly journals Dynamical Particle Motions in Vortex Flows

10.5772/66315 ◽  
2017 ◽  
Author(s):  
Steven Wang ◽  
Naoto Ohmura
Keyword(s):  
Vortex Flows

scholarly journals Spatial confinement of active microtubule networks induces large-scale rotational cytoplasmic flow

2017 ◽  
Vol 114 (11) ◽  
pp. 2922-2927 ◽  
Author(s):  
Kazuya Suzuki ◽  
Makito Miyazaki ◽  
Jun Takagi ◽  
Takeshi Itabashi ◽  
Shin’ichi Ishiwata
Keyword(s):  
Fluid Flow ◽  
Cytoplasmic Streaming ◽  
Large Scale ◽  
Random Network ◽  
Hydrodynamic Interactions ◽  
Length Scale ◽  
Vortex Flows ◽  
Directed Flow ◽  
Collective Behaviors ◽  
In Cells

Collective behaviors of motile units through hydrodynamic interactions induce directed fluid flow on a larger length scale than individual units. In cells, active cytoskeletal systems composed of polar filaments and molecular motors drive fluid flow, a process known as cytoplasmic streaming. The motor-driven elongation of microtubule bundles generates turbulent-like flow in purified systems; however, it remains unclear whether and how microtubule bundles induce large-scale directed flow like the cytoplasmic streaming observed in cells. Here, we adopted Xenopus egg extracts as a model system of the cytoplasm and found that microtubule bundle elongation induces directed flow for which the length scale and timescale depend on the existence of geometrical constraints. At the lower activity of dynein, kinesins bundle and slide microtubules, organizing extensile microtubule bundles. In bulk extracts, the extensile bundles connected with each other and formed a random network, and vortex flows with a length scale comparable to the bundle length continually emerged and persisted for 1 min at multiple places. When the extracts were encapsulated in droplets, the extensile bundles pushed the droplet boundary. This pushing force initiated symmetry breaking of the randomly oriented bundle network, leading to bundles aligning into a rotating vortex structure. This vortex induced rotational cytoplasmic flows on the length scale and timescale that were 10- to 100-fold longer than the vortex flows emerging in bulk extracts. Our results suggest that microtubule systems use not only hydrodynamic interactions but also mechanical interactions to induce large-scale temporally stable cytoplasmic flow.

scholarly journals Finite-dimensional description of non-newtonian vortex flows

1996 ◽  
Vol 1 ◽  
pp. 241-253 ◽  
Author(s):  
Roger E. Khayat
Keyword(s):  
Vortex Flows ◽  
Finite Dimensional

Singular vortex flows in plasmas with anisotropic pressure

1989 ◽  
Vol 138 (3) ◽  
pp. 127-130 ◽  
Author(s):  
V.Yu. Bychenkov ◽  
V.P. Silin ◽  
V.T. Tikhonchuk
Keyword(s):  
Anisotropic Pressure ◽  
Vortex Flows ◽  
Singular Vortex

scholarly journals Vortex Flows in the Solar Atmosphere: Automated Identification and Statistical Analysis

2018 ◽  
Vol 869 (2) ◽  
pp. 169 ◽  
Author(s):  
Ioannis Giagkiozis ◽  
Viktor Fedun ◽  
Eamon Scullion ◽  
David B. Jess ◽  
Gary Verth
Keyword(s):  
Statistical Analysis ◽  
Solar Atmosphere ◽  
Vortex Flows ◽  
Automated Identification
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