scholarly journals A transient backward erosion piping model based on laminar flow transport equations

2021 ◽  
Vol 132 ◽  
pp. 103992
Author(s):  
Manuel Wewer ◽  
Juan Pablo Aguilar-López ◽  
Matthijs Kok ◽  
Thom Bogaard
Keyword(s):  
Laminar Flow ◽  
Transport Equations ◽  
Model Based ◽  
Flow Transport ◽  
Backward Erosion Piping

A transient backward erosion piping model based on laminar flow transport equations

2021 ◽  
Author(s):  
Manuel Wewer ◽  
Juan Pablo Aguilar-López ◽  
Matthijs Kok ◽  
Thom Bogaard
Keyword(s):  
Sediment Transport ◽  
Laminar Flow ◽  
Particle Motion ◽  
Model Performance ◽  
Conservation Equation ◽  
Transport Equations ◽  
Bedload Transport ◽  
Internal Erosion ◽  
Backward Erosion Piping ◽  
Sandy Aquifers

<p>Backward erosion piping (BEP) has been proven to be one of the main failure mechanisms of water-retaining structures worldwide. Dikes, which are often built on sandy aquifers, are particularly vulnerable to this special type of internal erosion. In this research, we propose a numerical solution that combines a 2D Darcy groundwater solution with Exner’s 1D sediment transport mass conservation equation. The inclusion of criteria for incipient particle motion, as well as the linkage of the bedload transport rate to the pipe progression, enables us to build a stable time-dependent piping model. As an estimate of sediment transport, we tested four different empirical transport equations for laminar flow. The model performance was evaluated based on the results of a real-scale dike failure experiment. Through this, we were able to demonstrate the applicability of existing sediment transport equations to the description of particle motion during piping erosion. The proposed transient piping model not only predicts the pipe progression in time, it also allows for an identification of pore pressure transitions due to the erosion process. The main finding of the study is that from the four different modeling approaches for laminar flow, it is recommended to follow the approach of Yalin et al. (1963, 1979) to simulate backward erosion piping in dikes.</p>

scholarly journals Transition model based design method investigation on laminar flow nacelle

2020 ◽  
Vol 1592 ◽  
pp. 012006
Author(s):  
Yang Tao ◽  
Neng Xiong ◽  
Kang Huang ◽  
Lin Jun ◽  
Junqiang Wu
Keyword(s):  
Laminar Flow ◽  
Design Method ◽  
Transition Model ◽  
Model Based

New generalized model based on Onsager's transport equations for describing PDLC's morphology

2004 ◽  
Author(s):  
Vincent Rachet ◽  
Patrick Feneyrou ◽  
Pierre L. Le Barny ◽  
Brigitte Loiseaux ◽  
Jean-Pierre Huignard
Keyword(s):  
Transport Equations ◽  
Generalized Model ◽  
Model Based

scholarly journals A seamless hybrid RANS-LES model based on transport equations for the subgrid stresses and elliptic blending

2010 ◽  
Vol 22 (5) ◽  
pp. 055104 ◽  
Author(s):  
Atabak Fadai-Ghotbi ◽  
Christophe Friess ◽  
Rémi Manceau ◽  
Jacques Borée
Keyword(s):  
Transport Equations ◽  
Model Based ◽  
Subgrid Stresses ◽  
Les Model

scholarly journals The mechanics of a glacier snout

2015 ◽  
Vol 61 (230) ◽  
pp. 1118-1120 ◽  
Author(s):  
J.F. Nye
Keyword(s):  
Laminar Flow ◽  
Strain Rate ◽  
Longitudinal Strain ◽  
Simple Shearing ◽  
Model Based ◽  
Flow Law ◽  
Longitudinal Strain Rate

AbstractMeasurements made on a temperate glacier within 200 m of its wedge-shaped terminus cannot be interpreted as simple laminar flow. Instead they are fully explained by a model based on the nonlinear (n ≈ 3) Glen flow law that superposes longitudinal strain rate and simple shearing.

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