Georg-August University, Göttingen, Germany
Energy piles, i.e. heat exchangers located within the foundation piles of buildings, are used for heating of cooling purposes. Although the absolute values of deformations and temperature gradients are low or moderate, the entire setting can be influenced by thermo-hydro-mechanical coupling. The fluctuating thermal regime may affect the deformation of pile and surrounding ground as effect of ...
E. Dagher, G. Su, T. S. Nguyen
Canadian Nuclear Safety Commission, Ottawa, ON, Canada
COMSOL® software was used to simulate the conductive heat transfer with phase change in the geological formations encompassed in permafrost surrounding a shallow thaw lake. The purpose of the simulation was to verify the adequacy of COMSOL to model such phenomena by comparing the COMSOL results to those obtained by another FEM model (Ling and Zhang, 2003). The graphical comparison of the ...
Georg-August Universität Göttingen, Göttingen, Germany
We examine the poroelastics mode, which couples hydraulics and mechanics by some basic benchmarks. For cases with analytical solutions we check the accuracy for changing meshes and calculate the convergence rate.
Á. Sainz [1,2], A. Nardi , E. Abarca , F. Grandía 
 Amphos 21 Consulting S.L., Barcelona, Spain
 Université Toulouse III - Paul Sabatier, Toulouse, France
Nowadays, gas and nuclear waste storage, shale gas and EOR exploitation rise the need to understand and predict the fate of multiphase flows in the underground. Various formulations for multiphase flow arise from different linear combinations of governing equations and choice of associated unknowns. Each formulation has its own benefits and drawbacks; and the optimal may vary depending on the ...
Numerical Study of Flux Models for CO2 - Enhanced Natural Gas Recovery and Potential CO2 Storage in Shale Gas Reservoirs - new
N. Prajapati, P. L. Mills
Department of Chemical & Natural Gas Engineering, Texas A&M University, Kingsville, TX, USA
This work encompasses different physics involved in fluid flow in shale gas reservoir. Non-linear equations for fluid flow are solved with COMSOL Multiphysics® PDE module. It focuses on comparing the performance of various species transport flux models by accounting for inter-molecular interactions and gas-rock interactions.
M. Mokhtari , S. A. Madani , A. Seibi ,
 Department of Petroleum Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA
Accurate estimation of rock permeability and porosity play a crucial role in the evaluation of oil and gas reservoirs. This evaluation is, however, challenging in tight formations such as shale due to the slow transition of fluid in such formations with extremely-low permeability. To overcome the long experimental time of conventional technique for permeability measurement (steady-state method), ...
F. Bergeron, P. Pasquier
École Polytechnique de Montréal, Montréal, QC, Canada
Ground freezing techniques using liquid nitrogen are commonly used in order to increase the mechanical properties of the soils. This article presents a new ground heat exchanger using aluminum to increase the effective radius of the heat exchanger. Simulation results indicate that the current design generates a significant thermal short-circuit between the circulation pipes that must be ...
J. Perko, S. C. Seetharam, and D. Mallants
Belgian Nuclear Research Centre
Knowledge of the effect of fractures on fluid flow and transport is of great interest in many fields. In radioactive waste disposal the interest in fractures within concrete structure is because they are mostly more permeable than the matrix, there is less or no sorption and because long-term chemical concrete degradation could progress faster. Assessment of long-term transport processes is ...
A. Nardi, L. M. de Vries, P. Trinchero, A. Enrique Idiart , J. Molinero
Amphos 21, Barcelona, Spain
Phreeqc is a program for simulating chemical reactions and 1D transport processes in aqueous systems. Several couplings between conservative transport codes and PHREEQC already exist. The methodology used here is based on the operator splitting concept: the transport of the aqueous components and the chemical reactions are solved in two different steps. The Java interface uses the COMSOL Java ...
T. K. Chou, M. Chouteau, M. J. Yi
Department of Civil, Geological & Mining Engineering, École Polytechnique de Montréal, Montreal, QC, Canada
Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea
Time-lapse electrical resistivity tomography (ERT) method provides a non-invasive way to monitor subtle sub-surface changes caused by water flow such as in an infiltration test. Problems arise when the inversion models contain artifacts due to measurement errors, rapid change in soil electrical property during measurement time, etc. A new approach was developed by Kim et al. (2004) and (2009) ...