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Study of HVDC Grounding Systems Using Finite Element Methods
C. K. C. Arruda [1], A. A. Silveira [1], L. C. R. Vieira [1], F. C. Dart [1],
[1] CEPEL, Rio de Janeiro, RJ, Brazil
High Voltage Direct Current transmission (HVDC) is a suitable alternative for long distance transmission. During the years, the use of this technology has been increasing, which is one of the several reasons to improve methodologies in HVDC grounding systems. Unlike the usual approach in AC, a HVDC grounding system is distinguished by its operating procedures, which is, when it is configured ...
Benchmarking Tailored Formulations of Multiphase Flow in Porous Media
Á. Sainz [1,2], A. Nardi [1], E. Abarca [1], F. Grandía [1]
[1] Amphos 21 Consulting S.L., Barcelona, Spain
[2] 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 ...
Developments in a Coupled Thermal-Hydraulic-Chemical-Geomechanical Model for Soil and Concrete
S.C. Seetharam[1], D. Jacques[1]
[1]Performance Assessments Unit, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
This paper documents current status in the development of a coupled thermal-hydraulic-chemical-geomechanical numerical suite within COMSOL-MATLAB environment to address soil and concrete applications. The mathematical formulations are based on well-established continuum scale models unifying mass conservation, energy conservation, charge conservation, thermodynamic equilibrium and kinetics and ...
Submarine Gas Hydrate Reservoir Simulations - A Gas/Liquid Fluid Flow Model for Gas Hydrate Containing Sediments - new
S. Schlüter[1], T. Hennig[1], G. Janicki[1], G. Deerberg[1]
[1]Fraunhofer UMSICHT, Oberhausen, Germany
In the medium term, gas hydrate reservoirs in the subsea sediment are intended as deposits for carbon dioxide (CO2) from fossil fuel consumption. This idea is supported by the fact, that CO2 hydrates are more stable than methane hydrates at certain conditions. The potential of producing methane by depressurization and/or by injecting CO2 is studied in the frame of the research project SUGAR. ...
Integration of the DeProF Model for Two-Phase Flow in P.M. into the Subsurface Flow Module
M. S. Valavanides [1], E. D. Skouras [2], A. N. Kalarakis [3], V. N. Burganos [2],
[1] TEI Athens, Athens, Greece
[2] FORTH/ICE-HT, Patras, Greece
[3] TEI of Western Greece, Patras, Greece
Relative permeability maps for steady-state two-phase flow in porous media, delivered by implementing the DeProF model [1] algorithm, were integrated within COMSOL Multiphysics® software [2] to resolve field-scale flows in porous media. The mechanistic model DeProF [1], predicts the relative permeability of oil and water in terms of the capillary number, Ca, the oil/water flowrate ratio, r, ...
Development of a Thermo-Hydro-Geochemical Model for Low-Temperature Geoexchange Applications
F. Eppner [1], P. Pasquier [1], P. Baudron [1],
[1] École Polytechnique de Montréal, Montréal, QC, Canada
Standing column wells (SCW) are open-loop geoexchange systems used to provide space heating and cooling to buildings. As they use groundwater as heat carrier fluid and modify its thermo-chemical conditions along the year, they may favor calcite dissolution and precipitation, thus increasing maintenance costs. In order to predict the thermo-hydro-chemical (THC) processes occurring in a SCW and ...
Remote Sensing of Electromagnetically Penetrable Objects: Landmine and IED Detection
R. Eze [1], G. Sivulka [2], ,
[1] City University of New York - LaGuardia Community College, Long Island City, NY, USA
[2] Regis High School, New York, NY, USA
The detection, characterization, and classification of underground environmental hazardous objects [mines, IEDs, and other unexploded military hardware] is a worldwide problem that needs urgent attention and solution. While electromagnetic sensor technologies have been applied to identify these hazards, increasingly low dielectric contrast between newer, sophisticated landmines, and complex ...
Multiphysics Modelling of Standing Column Well and Implementation of Heat Pumps Off-Loading Sequence
A. Nguyen[1], P. Pasquier[1], D. Marcotte[1]
[1] Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montréal, QC, Canada
A fully coupled multiphysics model involving heat transfer and groundwater flow within a SCW and its surrounding ground was implemented in COMSOL Multiphysics 4.2a with MATLAB to simulate a 24-hour heating operation. The heat pumps were modeled using interpolation functions thereby allowing the effect of the pumped water temperature on the capacity and coefficient of performance of the heat ...
Numerical Study of Flux Models for CO2 - Enhanced Natural Gas Recovery and Potential CO2 Storage in Shale Gas Reservoirs - new
N. Prajapati[1], P. L. Mills[1]
[1]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.
Simulation of Heat Transfer during Artificial Ground Freezing Combined with Groundwater Flow
R. Hu [1], Q. Liu [1],
[1] School of Earth Science and Engineering, Hohai University, Nanjing, China
Based on the heat transfer and seepage theory in porous media, a 2D cross section of a horizontal AGF project is selected and a numerical model is set up, which is based on full coupling of temperature and flow fields by combining physical interfaces of Darcy's Law and Heat Transfer in Porous Media. The simulation results show that freezing wall appears in an asymmetrical shape as the ...
