scholarly journals Comparison of Flexible and Rigid Vegetation Induced Shear Layers in Partly Vegetated Channels

2021 ◽  
Author(s):  
Gerardo Caroppi ◽  
Kaisa Västilä ◽  
Paola Gualtieri ◽  
Juha Järvelä ◽  
Maurizio Giugni ◽  
...  
Keyword(s):  
Shear Layers ◽  
Rigid Vegetation ◽  
Vegetated Channels

Shear layers in partially vegetated channels

Shallow Flows ◽  
2004 ◽  
pp. 267-274 ◽  
Author(s):  
M Ghisalberti ◽  
B White ◽  
H Nepf
Keyword(s):  
Shear Layers ◽  
Vegetated Channels

The Structures of the Shear Layers in Box Shear Test of Soil

Landslides ◽  
1994 ◽  
Vol 31 (1) ◽  
pp. 10-20_1
Author(s):  
Ryojiro KISHIMOTO
Keyword(s):  
Shear Test ◽  
Shear Layers

Analysis of shear bands in slow granular flows using a frictional Cosserat model

2000 ◽  
Vol 627 ◽  
Author(s):  
Prabhu R. Nott ◽  
K. Kesava Rao ◽  
L. Srinivasa Mohan
Keyword(s):  
Scaling Laws ◽  
Shear Bands ◽  
Shear Layers ◽  
Theoretical Description ◽  
Field Variable ◽  
Cosserat Continuum ◽  
Momentum Balance ◽  
Rigid Plastic ◽  
Independent Field ◽  
Cosserat Model

ABSTRACTThe slow flow of granular materials is often marked by the existence of narrow shear layers, adjacent to large regions that suffer little or no deformation. This behaviour, in the regime where shear stress is generated primarily by the frictional interactions between grains, has so far eluded theoretical description. In this paper, we present a rigid-plastic frictional Cosserat model that captures thin shear layers by incorporating a microscopic length scale. We treat the granular medium as a Cosserat continuum, which allows the existence of localised couple stresses and, therefore, the possibility of an asymmetric stress tensor. In addition, the local rotation is an independent field variable and is not necessarily equal to the vorticity. The angular momentum balance, which is implicitly satisfied for a classical continuum, must now be solved in conjunction with the linear momentum balances. We extend the critical state model, used in soil plasticity, for a Cosserat continuum and obtain predictions for flow in plane and cylindrical Couette devices. The velocity profile predicted by our model is in qualitative agreement with available experimental data. In addition, our model can predict scaling laws for the shear layer thickness as a function of the Couette gap, which must be verified in future experiments. Most significantly, our model can determine the velocity field in viscometric flows, which classical plasticity-based model cannot.

Vortical substructures in the shear layers forming leading-edge vortices

AIAA Journal ◽  
2002 ◽  
Vol 40 ◽  
pp. 1689-1692 ◽  
Author(s):  
A. M. Mitchell ◽  
P. Molton
Keyword(s):  
Leading Edge ◽  
Shear Layers ◽  
Leading Edge Vortices

A preliminary study of optical properties of inhomogeneous shear layers

1984 ◽  
Author(s):  
H. JOHARI ◽  
H. POLING ◽  
D. BOGDANOFF ◽  
W. CHRISTIANSEN
Keyword(s):  
Optical Properties ◽  
Shear Layers ◽  
Preliminary Study
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