scholarly journals A formulation for decoupling components in reactive transport problems

2004 ◽  
Vol 40 (10) ◽  
Author(s):  
Sergi Molins ◽  
Jesús Carrera ◽  
Carlos Ayora ◽  
Maarten W. Saaltink
Keyword(s):  
Reactive Transport ◽  
Transport Problems

scholarly journals PROOST: object-oriented approach to multiphase reactive transport modeling in porous media

2015 ◽  
Vol 18 (2) ◽  
pp. 310-328 ◽  
Author(s):  
P. Gamazo ◽  
L. J. Slooten ◽  
J. Carrera ◽  
M. W. Saaltink ◽  
S. Bea ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Chemical Species ◽  
Object Oriented ◽  
Object Oriented Programming ◽  
Transport Modeling ◽  
Reactive Transport Modeling ◽  
Hydrodynamic Processes ◽  
Object Oriented Approach ◽  
Transport Problems ◽  
Oriented Approach

Reactive transport modeling involves solving several nonlinear coupled phenomena, among them, the flow of fluid phases, the transport of chemical species and energy, and chemical reactions. There are different ways to consider this coupling that might be more or less suitable depending on the nature of the problem to be solved. In this paper we acknowledge the importance of flexibility on reactive transport codes and how object-oriented programming can facilitate this feature. We present PROOST, an object-oriented code that allows solving reactive transport problems considering different coupling approaches. The code main classes and their interactions are presented. PROOST performance is illustrated by the resolution of a multiphase reactive transport problem where geochemistry affects hydrodynamic processes.

A modified batch reactor system to study equilibrium-reactive transport problems

2012 ◽  
Vol 129-130 ◽  
pp. 2-9 ◽  
Author(s):  
Gautham P. Jeppu ◽  
T. Prabhakar Clement ◽  
Mark O. Barnett ◽  
Kang-Kun Lee
Keyword(s):  
Reactive Transport ◽  
Batch Reactor ◽  
Reactor System ◽  
Transport Problems

On the Efficiency of the Direct Substitution Approach for Reactive Transport Problems in Porous Media

2008 ◽  
Vol 193 (1-4) ◽  
pp. 299-308 ◽  
Author(s):  
Marwan Fahs ◽  
Jérôme Carrayrou ◽  
Anis Younes ◽  
Philippe Ackerer
Keyword(s):  
Porous Media ◽  
Reactive Transport ◽  
Direct Substitution ◽  
Transport Problems

scholarly journals A procedure for the solution of multicomponent reactive transport problems

2005 ◽  
Vol 41 (11) ◽  
Author(s):  
M. De Simoni ◽  
J. Carrera ◽  
X. Sánchez-Vila ◽  
A. Guadagnini
Keyword(s):  
Reactive Transport ◽  
Transport Problems ◽  
Multicomponent Reactive Transport

Meshfree models for simulation of reactive transport in groundwater systems

2021 ◽  
Author(s):  
Aatish Anshuman ◽  
t i Eldho
Keyword(s):  
Reactive Transport ◽  
Hydrological Cycle ◽  
Operator Splitting ◽  
Meshfree Method ◽  
Anthropogenic Sources ◽  
Numerical Dispersion ◽  
Problem Domain ◽  
Point Collocation ◽  
Underground Waste Storage ◽  
Transport Problems

<p>Groundwater is the largest source for freshwater which plays an important role in the hydrological cycle. The pollution of groundwater is on the rise due to various natural and anthropogenic sources such as landfills, agricultural lands, and underground waste storage facilities etc. These pollutants can be subjected to reactions depending on the contaminant type and the subsurface environment along with advection and dispersion processes.  As groundwater is used in various human activities such as drinking, agriculture and industrial activities, it is essential to track the contaminants in groundwater for assessing possible environmental impacts. The complex phenomena of flow and contaminant transport are represented by partial differential equations (PDEs) which are solved numerically throughout the problem domain. Although Finite Difference method (FDM) and Finite Element Method (FEM) based models are conventionally used for these simulations, these methods suffer from certain instabilities due to the presence of mesh/grid, for example, numerical dispersion and artificial oscillation for advection and reaction dominant problems. Moreover, these methods are not suitable for adaptive analysis which requires meshing and re-meshing in each simulation making the problem highly computationally expensive. Here, we present a strong form meshfree method named Radial Point Collocation Method (RPCM) for modelling flow and transport in groundwater. In contrast to mesh-based methods, the problem domain is discretised using only nodes in the proposed method. Moreover, unlike the mesh-based methods, it produces stable solutions for advection and reaction dominant problems without using special techniques such as up-winding, adaptive re-meshing or, operator splitting. The performance of the model is tested against analytical solutions, FDM and FEM based models for different reactive transport problems in groundwater involving adsorption, decay, multi-species decay network and biodegradation.</p>

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