scholarly journals Modelling Methods Attached to the Research of Groundwater Flow in Fractured Rocks – Theories, Laboratory and Numerical Modelling

2016 ◽  
pp. 437-448
Author(s):  
Gyöngyi Karay ◽  
◽  
Géza Hajnal ◽  
Keyword(s):  
Numerical Modelling ◽  
Groundwater Flow ◽  
Fractured Rocks ◽  
Modelling Methods

scholarly journals Flexible parallel implicit modelling of coupled thermal–hydraulic–mechanical processes in fractured rocks

Solid Earth ◽  
2017 ◽  
Vol 8 (5) ◽  
pp. 921-941 ◽  
Author(s):  
Mauro Cacace ◽  
Antoine B. Jacquey
Keyword(s):  
Groundwater Flow ◽  
Fractured Rocks ◽  
Object Oriented ◽  
Coupled System ◽  
Weak Sense ◽  
Rock Properties ◽  
Solid Matrix ◽  
Scaling Parameters ◽  
Active Processes ◽  
Element Technique

Abstract. Theory and numerical implementation describing groundwater flow and the transport of heat and solute mass in fully saturated fractured rocks with elasto-plastic mechanical feedbacks are developed. In our formulation, fractures are considered as being of lower dimension than the hosting deformable porous rock and we consider their hydraulic and mechanical apertures as scaling parameters to ensure continuous exchange of fluid mass and energy within the fracture–solid matrix system. The coupled system of equations is implemented in a new simulator code that makes use of a Galerkin finite-element technique. The code builds on a flexible, object-oriented numerical framework (MOOSE, Multiphysics Object Oriented Simulation Environment) which provides an extensive scalable parallel and implicit coupling to solve for the multiphysics problem. The governing equations of groundwater flow, heat and mass transport, and rock deformation are solved in a weak sense (either by classical Newton–Raphson or by free Jacobian inexact Newton–Krylow schemes) on an underlying unstructured mesh. Nonlinear feedbacks among the active processes are enforced by considering evolving fluid and rock properties depending on the thermo-hydro-mechanical state of the system and the local structure, i.e. degree of connectivity, of the fracture system. A suite of applications is presented to illustrate the flexibility and capability of the new simulator to address problems of increasing complexity and occurring at different spatial (from centimetres to tens of kilometres) and temporal scales (from minutes to hundreds of years).

Comparison of Numerical Modelling Methods of Innovative Materials for Ballistic Shields

2020 ◽  
pp. 119-127
Author(s):  
Adrianna Mackiewicz ◽  
Dariusz Pyka ◽  
Joanna Pach ◽  
Krzysztof Jamroziak ◽  
Mirosław Bocian
Keyword(s):  
Numerical Modelling ◽  
Innovative Materials ◽  
Modelling Methods

scholarly journals Modelling of Groundwater Flow in Fractured Rocks

2015 ◽  
Vol 25 ◽  
pp. 142-149 ◽  
Author(s):  
Gy. Karay ◽  
G. Hajnal
Keyword(s):  
Groundwater Flow ◽  
Fractured Rocks

Numerical modelling of groundwater flow and contaminant transport to Point Pelee marsh, Ontario, Canada

2004 ◽  
Vol 18 (2) ◽  
pp. 293-314 ◽  
Author(s):  
Allan S. Crowe ◽  
Steven G. Shikaze ◽  
Carol J. Ptacek
Keyword(s):  
Numerical Modelling ◽  
Groundwater Flow ◽  
Contaminant Transport ◽  
Point Pelee

scholarly journals Reviews of lnvestigation and Analysis methods for Groundwater Flow in Fractured Rocks

2002 ◽  
Vol 44 (2) ◽  
pp. 81-103 ◽  
Author(s):  
Masahito YOSHIMURA ◽  
Masayuki IMAIZUMI ◽  
Yasuo SAKURA ◽  
Changyuan TANG
Keyword(s):  
Groundwater Flow ◽  
Fractured Rocks ◽  
Analysis Methods

A High Temperature Heat Injection Test – Numerical Modelling and Sensitivity Analysis

2021 ◽  
Author(s):  
Stefan Heldt ◽  
Bo Wang ◽  
Sebastian Bauer
Keyword(s):  
Sensitivity Analysis ◽  
High Temperature ◽  
Temperature Distribution ◽  
Hydraulic Conductivity ◽  
Numerical Modelling ◽  
Groundwater Flow ◽  
Thermal Plume ◽  
Injection Test ◽  
Simulated Temperature ◽  
Heat Injection

<p>With the transition of the heating sector towards renewable energy sources technologies are needed to compensate for the seasonal mismatch between heat supply and demand. Aquifer thermal energy storage (ATES) is considered a promising candidate for that purpose. Especially high temperature ATES (HT-ATES) with temperatures up to 90 °C has the advantage of higher storage capacities and allows for the direct use of the stored heat without intermediate heat pumps. In order to improve the understanding of processes induced by HT-ATES and to validate numerical tools for the prediction of storage capacities, storage rates as well as thermal impacts, a heat injection field test with an injection temperature of 75 °C was conducted, densely monitored and numerically simulated. This work presents a sensitivity analysis of the governing processes and parameters, from which the parameters on which the simulation results are most dependent are derived and thus identified for future site characterization and monitoring studies.</p><p>The heat injection test took place at a shallow aquifer with a low natural groundwater flow velocity of 0.07 m/d. Hot water was injected at a borehole using flow rates of 14 l/min for 4.5 days and the resulting thermal plume was monitored by a dense arrangement of thermocouples. Previous to the experiment, the field site was thoroughly investigated for the thermal and hydraulic parameters by standard hydrogeological methods, such as pumping tests, hydraulic head measurements, Hydraulic Profiling Tool (HTP) employment, liner sampling and laboratory measurements.  A coupled heat transport and fluid flow model was set up and the heat injection test was simulated using high resolution numerical modelling of the coupled thermo-hydraulic processes using the OpenGeoSys (OGS) simulation code.</p><p>The comparison of measured and simulated temperature breakthrough curves showed a good correspondence, indicating the capability of the model to predict the general thermal behaviour of the heat injection test. The accuracy was higher for larger distances to the injection well and at the longer time scale, while the largest deviations occurred close to the injection well and shortly after the injection. The model was then used to estimate the sensitivity of the simulated temperature distribution on thermal and hydraulic aquifer parameters, which were varied according to the span of measurements. The thermal plume development is most sensitive on the hydraulic conductivity, since this parameter influences the intensity of buoyancy driven flow and was measured in the large range 3.00E-05 to 7.15 E-04 m/s. The dispersivity and the anisotropy in hydraulic conductivity effect the same process and show a significant impact on the result as well, together with the thermal conductivity. The sensitivity of the simulated temperature distribution on the groundwater flow velocity and the specific heat capacity is a little lower compared to the previously mentioned parameters, while the result is insensitive to the specific storage. It is shown, that a heat injection test in combination with numerical simulations is suitable for identifying parameter sensitivities also on small scales, thus showing the investigation needs for HT-ATES projects.</p>

Numerical Modelling Methods for Ultrasonic Wave Propagation Through Polycrystalline Materials

2019 ◽  
Vol 72 (11) ◽  
pp. 2923-2932 ◽  
Author(s):  
S. Shivaprasad ◽  
C. V. Krishnamurthy ◽  
Abhishek Pandala ◽  
Anuraag Saini ◽  
Adithya Ramachandran ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Numerical Modelling ◽  
Ultrasonic Wave ◽  
Polycrystalline Materials ◽  
Ultrasonic Wave Propagation ◽  
Modelling Methods
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