581 Hits in 21.6 sec

Three-dimensional simulation of unstable gravity-driven infiltration of water into a porous medium

Hector Gomez, Luis Cueto-Felgueroso, Ruben Juanes
2013 Journal of Computational Physics  
We simulate, for the first time, unstable gravity-driven infiltration in three dimensions, and confirm that the new theory reproduces the fundamental features of water infiltration into a porous medium  ...  10 Infiltration of water in dry porous media is subject to a powerful gravity-driven instability.  ...  simulations of water infiltration into a porous medium.  ... 
doi:10.1016/ fatcat:5jva5bxvonfr3pypqxhvf22tra

Stability of gravity-driven multiphase flow in porous media: 40 Years of advancements

D. A. DiCarlo
2013 Water Resources Research  
Introduction [2] In hydrology, the classic case of gravity-driven multiphase flow in porous media is infiltration of water in soil.  ...  cell, flow in porous media is inherently three-dimensional.  ... 
doi:10.1002/wrcr.20359 fatcat:u6ys5psnk5f3fegn2ph6vniu5a

Prediction of fingering in porous media

Zhi Wang, Jan Feyen, David E. Elrick
1998 Water Resources Research  
Immiscible displacement, involving two fluids in a porous medium, can be unstable and fingered under certain conditions.  ...  Scenarios of water and nonaqueous-phase liquid infiltration into the vadose zone are examined to predict preferential flow and contamination of groundwater.  ...  for three-dimensional finger diameter.  ... 
doi:10.1029/98wr01472 fatcat:6gtinivl2bgt5csk7xtu4t3r5y

Non-equilibrium model for gravity-driven fingering in water repellent soils: Formulation and 2D simulations [chapter]

J. Nieber, A. Sheshukov, A. Egorov, R. Dautov
2003 Soil Water Repellency  
A numerical solution of the mass balance equation, based on a mass conservative scheme, is applied to the simulation of infiltrating flows in a vertical, two-dimensional plane region.  ...  Conditions of even slight water repellency are found to be sufficient to cause infiltrating flows to become unstable.  ...  -2-0014, the content of which does not necessarily reflect the position or the policy of the government, and no official endorsement should be inferred.  ... 
doi:10.1016/b978-0-444-51269-7.50025-4 fatcat:jmkjuw4ayvf7pfulmlnhdp3pdy

Simulation of two-dimensional gravity-driven unstable flow [chapter]

R.Z. Dautov, A.G. Egorov, J.L. Nieber, A.Y. Sheshukov
2002 Developments in Water Science  
A mass conservative and computational efficient numerical solution to the coupled equations in two space dimensions is derived and applied to the simulation of gravity-driven unstable flow.  ...  Simulated fingers have all the morphological features of fingers observed in laboratory experiments.  ...  Introduction There are two main requirements for modeling the phenomenon of gravity-driven fingering in unsaturated porous media: (i) the mathematical model must be capable of producing unstable perturbations  ... 
doi:10.1016/s0167-5648(02)80039-9 fatcat:wz52vurb4jfnnajo4wqqkdi7ku

Preferential flow systems amended with biogeochemical components: imaging of a two-dimensional study

Ashley R. Pales, Biting Li, Heather M. Clifford, Shyla Kupis, Nimisha Edayilam, Dawn Montgomery, Wei-zhen Liang, Mine Dogan, Nishanth Tharayil, Nicole Martinez, Stephen Moysey, Brian Powell (+1 others)
2018 Hydrology and Earth System Sciences  
This paper details the effects of simulated plant exudate and soil component solutions upon unstable flow patterns in a porous medium (ASTM silica sand; US Silica, Ottawa, IL, USA) through the use of two-dimensional  ...  </strong> The vadose zone is a highly interactive heterogeneous system through which water enters the subsurface system by infiltration.  ...  This material is based on work supported by the US Department of Energy Office of Science, Office of Basic Energy Sciences and Office of Biological and Environmental Research, under award number DE-SC-  ... 
doi:10.5194/hess-22-2487-2018 fatcat:ds7oockkrvevljfpfdo4zd4nri

Vadose Water [chapter]

J.R. Nimmo
2009 Encyclopedia of Inland Waters  
water After water has infiltrated, it redistributes, driven by gravity, matric pressure gradients, and possibly other forces.  ...  The high water content of a perched zone causes greater hydraulic conductivity and potentially faster transport through the three-dimensional system.  ... 
doi:10.1016/b978-012370626-3.00014-4 fatcat:7olfebj75zf7fmes6n3wlmbowm

Mechanistic modeling of fingering, nonmonotonicity, fragmentation, and pulsation within gravity/buoyant destabilized two-phase/unsaturated flow

Robert J. Glass, Lane Yarrington
2003 Water Resources Research  
medium; (2) upward buoyancy-driven migration of gas within a water saturated, heterogeneous, water-wettable, porous medium; and (3) downward gravity-driven fingering of water into a dry, water-wettable  ...  We present example simulations and compare them to experimental data for three very different situations: (1) downward gravity-driven fingering of water into a dry, homogeneous, water-wettable, porous  ...  Nicholl (University of Idaho) as well as the constructive reviews of two anonymous reviewers. This research was supported by the U.S.  ... 
doi:10.1029/2002wr001542 fatcat:7c7rb6amzjej7esnlatbizsfxy

Numerical simulations of gravity-driven fingering in unsaturated porous media using a nonequilibrium model

Michael Chapwanya, John M. Stockie
2010 Water Resources Research  
This is a computational study of gravity-driven fingering instabilities in unsaturated porous media. The governing equations and corresponding numerical scheme are based on the work of Nieber et al.  ...  [Ch. 23 in Soil Water Repellency, eds. C. J. Ritsema and L. W.  ...  Acknowledgments This work was funded by research grants from the Natural Sciences and Engineering Research Council of Canada and the MITACS Network of Centres of Excellence.  ... 
doi:10.1029/2009wr008583 fatcat:mdhgxvmxsrgkbhcdmyxq4gdqmm

Infiltration in a double-porosity medium: Experiments and comparison with a theoretical model

Jolanta Lewandowska, Adam Szymkiewicz, Wioletta Gorczewska, Michel Vauclin
2005 Water Resources Research  
The calculated time evolutions of both water infiltrating into and flowing out from the double-porosity medium were compared with the experimental results.  ...  A series of one-dimensional infiltration experiments was carried out in a column filled with a double-porosity medium composed of a mixture of sand and sintered clayey spheres arranged in a periodic manner  ...  Numerical Simulation of the Infiltration Into the Double-Porosity Medium [36] The numerical simulation of the infiltration experiments was performed according to the mathematical model presented in section  ... 
doi:10.1029/2004wr003504 fatcat:7h2ughxsorf23hd5q6s5fqwsoy

A phase field model of unsaturated flow

L. Cueto-Felgueroso, R. Juanes
2009 Water Resources Research  
We thank John Selker for leading an insightful review process, which led to an improved presentation of the material.  ...  Schematic of vertical infiltration of water into a porous medium. Initially, the soil is almost dry (water saturation S 0 ).  ...  Two-Dimensional Simulations [68] We present 2-D simulations of gravity fingering during constant-flux infiltration in heterogeneous soils.  ... 
doi:10.1029/2009wr007945 fatcat:jv336jxvxbhh7h2lzesptjrare

Interplay between Fingering Instabilities and Initial Soil Moisture in Solute Transport through the Vadose Zone

Luis Cueto-Felgueroso, María José Suarez-Navarro, Xiaojing Fu, Ruben Juanes
2020 Water  
We present numerical simulations of passive solute transport during unstable infiltration of water into sandy soils that are prone to wetting front instability.  ...  We study the impact of the initial soil state, in terms of spatial distribution of water content, on the infiltration of a solute-rich water pulse.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/w12030917 fatcat:io2x4xnvrzcbdgltjywnqm7p64

Evolution of fluid flow and heat distribution over geological time scales at the margin of unconfined and confined carbonate sequences - A numerical investigation based on the Buda Thermal Karst analogue

T. Havril, J.W. Molson, J. Mádl-Szőnyi
2016 Marine and Petroleum Geology  
The limited thickness of the cover allowed sufficient water infiltration into the system, which led to increased cooling. Further uplifting led to a prevalence of gravity-driven groundwater flow.  ...  Applying an equivalent porous medium (EPM) approach using the Heatflow-Smoker finite element model, scenario modelling of three evolutionary steps was carried out between the fully-confined carbonate stage  ...  L aszl o Fodor (Geological, Geophysical and Space Science Research Group of the Hungarian Academy of Sciences, ELTE, Budapest, Hungary) helped place the simulations into a geological evolutionary framework  ... 
doi:10.1016/j.marpetgeo.2016.10.001 fatcat:v6fc5eej2fgnhlod7y3vhp3toq

Adaptive rational spectral methods for the linear stability analysis of nonlinear fourth-order problems

Luis Cueto-Felgueroso, Ruben Juanes
2009 Journal of Computational Physics  
Our model equation is a phase-field model of infiltration, but the proposed discretization can be directly extended to similar equations arising in thin film flows.  ...  We discuss the effectiveness and conditioning of the proposed discretization, and show that it allows the computation of accurate traveling waves and eigenvalues for small values of the initial water saturation  ...  Mathematical model of gravity-driven infiltration Consider constant-flux infiltration into a porous medium (Fig. 1) .  ... 
doi:10.1016/ fatcat:sh53ccxfazge7bo2fbtwhbqhgy

The interaction of two fluid phases in fractured media

Robert J Glass, Harihar Rajaram, Michael J Nicholl, Russell L Detwiler
2001 Current Opinion in Colloid & Interface Science  
In fractured porous media, interactions between immiscible fluid phases within the fractures place a critical control on system behavior.  ...  A key component of the interactions is the geometry, or structure, of the respective phases.  ...  Three-dimensional simulation of Stokes flow in a range of synthetic aperture fields has demonstrated that the Reynolds equation may overestimate flow by as much as a w ⅷ x factor of two 35 .  ... 
doi:10.1016/s1359-0294(01)00086-3 fatcat:6uti3e2strgwpiplmjgsqeme7q
« Previous Showing results 1 — 15 out of 581 results