Investigating the Impacts of Hydrogeological Parameters on DSI Efficiency through Numerical Simulation
Y. Jin, E. Holzbecher, S. Ebneth
Department of Applied Geology, GZG, Georg-August- University of Göttingen, Göttingen, Germany
Hölscher Wasserbau, Haren, Germany
Düsensauginfiltration (DSI),‘nozzle-suction-infiltration’, is a new method for dewatering that avoids groundwater abstraction from the aquifer. Drawdown is achieved via pumping of groundwater at upper abstraction section, meanwhile, all the pumped water is injected through the same borehole, but in greater depth. We use COMSOL Multiphysics® for the development of a 2D model that ...
E. Johansson, J. Acuña, B. Palm
Royal Institute of Technology KTH, Stockholm, Sweden
A field of connected boreholes can be used both for cooling, heating and storage purposes. The boreholes transfer heat to or from the ground, which over time changes the temperature in the ground. It is important that the borehole field is properly sized and evaluated before the construction. This study presents results from borehole field evaluations of inclined boreholes used for cooling ...
University of Dayton, Dayton, OH, USA
Geothermal heat pumps use the earth as a heat source and sink via a ground heat exchanger (GHX) that consists of a network of buried heat exchange pipes, which can either be installed in vertical boreholes or in shallow horizontal trenches or excavations. The main goal in GHX design is to determine the minimum length of pipe needed to provide adequate fluid temperatures to heat pumps over their ...
E. Abarca, A. Nardi, F. Grandia, J. Molinero
Amphos21 Consulting, Barcelona, Spain
The capture and storage of CO2 in deep geological formations is one of the proposed solutions to reduce CO2 emissions to the atmosphere. CO2 is injected as a supercritical fluid deep below a confining geological formation that prevents its return to the atmosphere. A configuration of denser CO2-enriched brine overlying lighter water leads to convective flow and the formation of gravity fingers of ...
D. Müller, H. Francke, G. Blöcher, H. Shao
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Potsdam, Brandenburg, Germany
Helmholtz-Zentrum für Umweltforschung UFZ, Leipzig, Saxony, Germany
The reactive transport simulation interface COMSOL-PHREEQC, developed by Wissmeier & Barry (2011), provides a MATLAB®-based coupling interface to combine COMSOL Multiphysics® for flow and heat transport simulations and PHREEQC as a geochemical batch reaction simulator. The functionality of the coupling tool is tested using the “calcite” example (Shao et al. 2010) as a benchmark. The results ...
E. Holzbecher, P. Oberdorfer, F. Maier, and Y. Jin
Georg-August Universität Göttingen
Geothermal heat production from deep reservoirs (5000-7000 m) is currently examined, not only in Germany. Our reference set-up consists of two pipes within a single borehole: one for pumping. We examine a design, where a single borehole splits into two legs at a certain depth. The two legs are connected by highly permeable geological, natural or artificial strata in the deep subsurface. The ...
The Simulation of Pore Scale Fluid Flow with Real World Geometries Obtained from X-Ray Computed Tomography
W. Fourie1, R. Said2, P. Young3, and D. L. Barnes1
1Department of Civil and Environmental Engineering, Water
and Environmental Research Center, University of Alaska, Fairbanks, AK, USA
2Simpleware, Ltd. Exeter, UK
3Computer Science and Mathematics, School of Engineering, University of Exeter, Exeter, UK
With the recent improvement of X-ray Computed Tomography and robust modeling tools, it is now possible to show that pore scale fluid flow modeled by the Navier-Stokes equation can be used to derive macro parameters of Darcy’s Law, such as the hydraulic conductivity. The model allows calculation of isotropy, tortuosity and dispersivity of the soil in all directions. These parameters, which are ...
R. Nopper, J. Clark, C. Miller
DuPont Company, Wilmington, DE, USA
DuPont Company, Beaumont, TX, USA
Stress and failure in the earth have long been observed to couple to hydrogeology. Poroelastic models, introduced by soil scientists, can account for strong two-way coupling between porous crustal rock formations and their pore fluids. Current efforts to provide new energy resources (water injection in EGS, enhanced oil recovery) and to reduce pollution (CO2 sequestration, deepwell disposal) ...
E. Evgin, J. A. Infante Sedano, Z. Fu
University of Ottawa, Ottawa, ON, Canada
A pile transfers structural load to the ground at the surface of its shaft and at its toe. In the calculation of these two components of load, both the deformation characteristics and the strength properties of the soil are needed. In unsaturated soils, matric suction changes the stress-strain-strength behavior of the soil. Similarly, the adhesion and the friction angle at the contact area ...
T. Fong, M. Chui, and D. L. Freyberg
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, USA
Hydrological processes and components are intrinsically coupled, and thus must often be modeled as an integrated system. Unfortunately, although a few modeling codes are available, integrated hydrological modeling remains a challenge.The objective of this paper is to explore the feasibility of using COMSOL Multiphysics for integrated hydrological modeling; in particular, using the generic ...