A Modified Time Domain Random Walk Approach for Simulating Colloid Behavior in Fractures: Method Development and Verification

2020 ◽  
Vol 56 (7) ◽  
Author(s):  
Ahmed Yosri ◽  
Sarah Dickson‐Anderson ◽  
Wael El‐Dakhakhni
Keyword(s):  
Random Walk ◽  
Time Domain ◽  
Method Development

scholarly journals Solute transport in aquifers of arbitrary variability: A time-domain random walk formulation

2014 ◽  
Vol 50 (7) ◽  
pp. 5759-5773 ◽  
Author(s):  
Vladimir Cvetkovic ◽  
Aldo Fiori ◽  
Gedeon Dagan
Keyword(s):  
Random Walk ◽  
Solute Transport ◽  
Time Domain

scholarly journals Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Yuexiu Wu ◽  
Quansheng Liu ◽  
Andrew H. C. Chan ◽  
Hongyuan Liu
Keyword(s):  
Random Walk ◽  
Time Domain ◽  
Fractured Rock ◽  
Fracture Network ◽  
External Stress ◽  
Matrix Diffusion ◽  
Rock Masses ◽  
The Matrix ◽  
Nuclide Transport ◽  
Fractured Rock Masses

It is essential to study nuclide transport with underground water in fractured rock masses in order to evaluate potential radionuclide leakage in nuclear waste disposal. A time-domain random-walk (TDRW) method was firstly implemented into a discrete element method (DEM), that is, UDEC, in this paper to address the pressing challenges of modelling the nuclide transport in fractured rock masses such as massive fractures and coupled hydromechanical effect. The implementation was then validated against analytical solutions for nuclide transport in a single fracture and a simple fracture network. After that, the proposed implementation was applied to model the nuclide transport in a complex fracture network investigated in the DECOVALEX 2011 project to analyze the effect of matrix diffusion and stress on the nuclide transport in the fractured rock masses. It was concluded that the implementation of the TDRW method into UDEC provided a valuable tool to study the nuclide transport in the fractured rock masses. Moreover, it was found that the total travel time of the nuclide particles in the fractured rock masses with the matrix diffusion and external stress modelled was much longer than that without the matrix diffusion and external stress modelled.

A New Time Domain Random Walk Method for Solute Transport in 1-D Heterogeneous Media

Ground Water ◽  
1997 ◽  
Vol 35 (6) ◽  
pp. 1008-1013 ◽  
Author(s):  
Olivier Banton ◽  
Frederick Delay ◽  
Gilles Porel
Keyword(s):  
Random Walk ◽  
Solute Transport ◽  
Time Domain ◽  
Heterogeneous Media ◽  
Random Walk Method ◽  
New Time

Warp Effects Studied by a Time-Domain Strip Model and Compared to Model Experiments

2020 ◽  
Author(s):  
Karl Garme
Keyword(s):  
Model Test ◽  
Time Domain ◽  
Method Development ◽  
Experimental Methods ◽  
Test Results ◽  
Regular Waves ◽  
Model Experiments ◽  
Strip Method ◽  
Calm Water ◽  
Research And Design

A time-domain strip method, in the Zarnick tradition, is used to discuss the modeling implications when alongships geometrical variations are studied, eg. warp or motion with frequent bow submergence. Results from simulations and published model test results for three warped hulls and their parent prismatic hull, in calm water and regular waves are presented. It is concluded that warp can be modelled by the strip approach. Non-the less, method development is proposed and the importance of combining different numerical end experimental methods both in research and design is stressed.

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