Darcy’s model with optimized permeability distribution for the simulation of Stokes flow and contaminant transport in karst aquifers

Citation

Material Information

Title:
Darcy’s model with optimized permeability distribution for the simulation of Stokes flow and contaminant transport in karst aquifers
Series Title:
Hydrogeology Journal
Creator:
Jamal, Mohammad S.
Awotunde, Abeeb A.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Numerical Modeling ( local )
Karst ( local )
Brinkman’S Equation ( local )
Contaminant Transport ( local )
Darcy’S Model ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Simulation of fluid flow in karst aquifers is challenging because of the presence of porous and free-flow regions within a single aquifer system. One simple but less accurate approach to model such a system is to use Darcy’s model. This model has much lower computational overhead than many other more rigorous approaches. The results obtained from the Darcy model are accurate for the porous regions of the aquifer, but it produces inaccurate results inside the caves. An approach is proposed called the Darcy model with optimized permeability distribution (DMOPD) for modeling accurate pressure and velocity distributions within the aquifer while retaining almost the same computational cost as the Darcy model. This method comprises three main steps. First, at the first time-step, the pressure and velocity distribution of the entire aquifer is solved using the Brinkman model. Then each cave is divided into an odd number of zones, with the middle zone assigned a maximum permeability value. Subsequently, the permeability ratios of the other surrounding zones are estimated using a global optimization technique. The permeability ratio is the ratio of permeability in that zone to the maximum permeability within the cave. Finally, the Darcy model is run for the remaining time steps using the optimized values of permeability obtained in the second step. Example applications presented show that this method is able to approximate the Brinkman model very well and much faster when compared to the Brinkman model.
Original Version:
Hydrogeology Journal, Vol. 28 (2020-02-15).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

USFLDC Membership

Aggregations:
University of South Florida
Karst Information Portal

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serial

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