Tutorials

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This tutorial presents the application of the open-source software OpenGeoSys(OGS) with a geochemical solver PHREEQC for ​ ​hydrological simulation concerning reactive transport modeling. It contains general information regarding reactive transport modeling and a step-by-step model set-up with OGS and PHREEQC, and related components such as GINA, Data Explorer, and ParaView. A code verification with Engesgaard benchmark and two application examples (Nitrate reduction and Treatment wetland) are presented in detail.

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Thermal energy storage is of high strategic relevance for the establishment of a sustainable energy system. The development of next-generation storage systems like thermochemical solutions is accompanied by major scientific and engineering challenges. Due to the complexity of the considered storage systems and the exceptional efforts for the development of storage materials as well as for the implementation of large-scale experiments, modelling and numerical simulation are of outstanding importance for the prediction of the operational behaviour and the optimization of thermochemical heat storage systems. The deployment of the necessary simulation tools is thus one of the key research topics in the area of thermal energy storage systems.

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In this book, effective computational methods to facilitate those pivotal simulations using open-source software are introduced and discussed with a special focus on the coupled thermo-mechanical behavior of the rock salt. A cohesive coverage of applying geotechnical modeling to the subsurface storage of hydrogen produced from renewable energy sources is accompanied by specific, reproducible example simulations to provide the reader with direct access to this fascinating and important field. Energy carriers such as natural gas, hydrogen, oil, and even compressed air can be stored in subsurface geological formations such as depleted oil or gas reservoirs, aquifers, and caverns in salt rock. Many challenges have arisen in the design, safety and environmental impact assessment of such systems, not the least of which is that large-scale experimentation is not a feasible option. Therefore, simulation techniques are central to the design and risk assessment of these and similar geotechnical facilities.

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This book explores the application of the open-source software OpenGeoSys (OGS) for hydrological numerical simulations concerning conservative and reactive transport modeling. It provides general information on the hydrological and groundwater flow modeling of a real case study and step-by-step model set-up with OGS, while also highlighting related components such as the OGS Data Explorer. The material is based on unpublished manuals and the results of a collaborative project between China and Germany (SUSTAIN H2O). Though the book is primarily intended for graduate students and applied scientists who deal with hydrological modeling, it also offers a valuable source of information for professional geoscientists wishing to expand their knowledge of the numerical modeling of hydrological processes including nitrate reactive transport modeling. This book is the second in a series that showcases further applications of computational modeling in hydrological science.

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This tutorial presents the introduction of the open-source software OpenGeoSys for enhanced geothermal reservoir modeling. There are various commercial software tools available to solve complex scientific questions in geothermics. This book will introduce the user to an open source numerical software code for geothermal modeling which can even be adapted and extended based on the needs of the researcher.

The book explains basic mathematical equations and numerical methods to modeling flow and heat transport in fractured porous rock formations. In order to help readers gain a system-level understanding of the necessary analysis, the authors include two benchmark examples and two case studies of real deep geothermal test-sites located in Germany and France.

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This book is dedicated to the numerical modeling of shallow geothermal systems. The utilization of shallow geothermal energy involves the integration of multiple Borehole Heat Exchangers (BHE) with Ground Source Heat Pump (GSHP) systems to provide heating and cooling. The modeling practices explained in this book can improve the efficiency of these increasingly common systems. The book begins by explaining the basic theory of heat transport processes in man-made as well as natural media. These techniques are then applied to the simulation of borehole heat exchangers and their interaction with the surrounding soil. The numerical and analytical models are verified against analytical solutions and measured data from a Thermal Response Test, and finally, a real test site is analyzed through the model and discussed with regard to BHE and GSHP system design and optimization.

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This introduction to geothermal modeling deals with flow and heat transport processes in porous and fractured media related to geothermal energy applications. Following background coverage of geothermal resources and utilization in several countries, the basics of continuum mechanics for heat transport processes, as well as numerical methods for solving underlying governing equations are discussed. This examination forms the theoretical basis for five included step-by-step OpenGeoSys exercises, highlighting the most important computational areas within geothermal resource utilization, including heat diffusion, heat advection in porous and fractured media, and heat convection. The book concludes with an outlook on practical follow-up contributions investigating the numerical simulation of shallow and deep geothermal systems.

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This tutorial on the application of the open-source software OpenGeoSys (OGS) in computational hydrology is based on a one-week HIGRADE-course at the Helmholtz Centre for Environmental Research in Leipzig, Germany. The book contains general information regarding hydrological and groundwater flow modelling and the pre-processing and step-by-step model set-up of a case study with OGS and related components such as the OGS Data Explorer. In addition, it also illustrates the application of pre- and post-processing tools such as ArcGIS or ParaView for the preparation of input data as well as the optimal presentation of simulation results.