scholarly journals Anisotropic Diffusion in Driven Convection Arrays

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 343
Author(s):  
Yunyun Li ◽  
Vyacheslav R. Misko ◽  
Fabio Marchesoni ◽  
Pulak K. Ghosh
Keyword(s):  
Laminar Flow ◽  
External Force ◽  
Anisotropic Diffusion ◽  
Nonlinear Response ◽  
Colloidal Particle ◽  
Diffusion Constant ◽  
Sharp Contrast ◽  
Rotating Convection ◽  
Convection Rolls ◽  
Square Array

We numerically investigate the transport of a Brownian colloidal particle in a square array of planar counter-rotating convection rolls at high Péclet numbers. We show that an external force produces huge excess peaks of the particle’s diffusion constant with a height that depends on the force orientation and intensity. In sharp contrast, the particle’s mobility is isotropic and force independent. We relate such a nonlinear response of the system to the advection properties of the laminar flow in the suspension fluid.

Generation of Mean Flows in a Rotating Convection Layer

1982 ◽  
Vol 37 (8) ◽  
pp. 752-758 ◽  
Author(s):  
F. H. Busse
Keyword(s):  
Numerical Experiments ◽  
Fluid Layer ◽  
Horizontal Component ◽  
Rotation Vector ◽  
Reynolds Stresses ◽  
Mean Flow ◽  
Rotating Convection ◽  
Convection Layer ◽  
The Mean ◽  
Convection Rolls

The instability of convection rolls in a fluid layer heatet from below is studied in the case where the layer rotates about an axis slightly inclined with respect to the vertical. The inclination destroys the horizontal isotropy of the layer, but the instability of rolls found by Küppers and Lortz [1] is little affected as long as the angle of inclination is small. A new effect is the generation of mean Reynolds stresses by rolls not aligned with the horizontal component of the rotation vector. The mean flow exhibits a vorticity of the same sign as the horizontal component of rotation and agrees qualitatively with the mean flow found in the numerical experiments of Hathaway and Somerville [2]

Diffusion of Active Particles in Convective Flows

Soft Matter ◽  
2020 ◽  
Author(s):  
Pulak Kumar Ghosh ◽  
Debajyoti Debnath ◽  
Yunyun Li ◽  
Fabio Marchesoni
Keyword(s):  
Janus Particle ◽  
Convective Flows ◽  
Rotating Convection ◽  
Periodic Arrays ◽  
Active Particles ◽  
Convection Patterns ◽  
Convection Rolls

We numerically investigated the diffusion of an active Janus particle in periodic arrays of planar counter-rotating convection rolls at high P\'eclet numbers. We considered convection patterns with distinct longitudinal and...

The Unassailable Self: Freud's Image Among Post-war American Intellectuals

2017 ◽  
Vol 19 (1) ◽  
pp. 55-75 ◽  
Author(s):  
Katherine Jenness
Keyword(s):  
World War Ii ◽  
Cold War ◽  
External Force ◽  
Sigmund Freud ◽  
Human Being ◽  
World War ◽  
The Us ◽  
Post War ◽  
The Cold War ◽  
The Way

This paper explores the way American intellectuals depicted Sigmund Freud during the peak of popularity and prestige of psychoanalysis in the US, roughly the decade and a half following World War II. These intellectuals insisted upon the unassailability of Freud's mind and personality. He was depicted as unsusceptible to any external force or influence, a trait which was thought to account for Freud's admirable comportment as a scientist, colleague and human being. This post-war image of Freud was shaped in part by the Cold War anxiety that modern individuality was imperilled by totalitarian forces, which could only be resisted by the most rugged of selves. It was also shaped by the unique situation of the intellectuals themselves, who were eager to position themselves, like the Freud they imagined, as steadfastly independent and critical thinkers who would, through the very clarity of their thought, lead America to a more robust democracy.

Properties of turbulence driven by random external force in the Burgers model

2016 ◽  
Vol 186 (12) ◽  
pp. 1349-1353
Author(s):  
Kirill P. Zybin ◽  
Anton S. Il'yn
Keyword(s):  
External Force ◽  
Burgers Model
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