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The subsurface is being increasingly utilized both as a resource and as an energy and waste repository. Historically, there have been few issues of concern related to competition between resources, with groundwater contamination being a notable exception. However, with increasing exploitation, resource conflicts are becoming increasingly common and complex. Current issues in this regard include, for example, the long-range impact of mechanical, chemical and thermal energy storage on groundwater resources, and the complex effects surrounding hydraulic fracturing in both geothermal and shale gas production. To analyze and predict the mutual influence of subsurface projects and their impact on groundwater reservoirs, advanced numerical models are necessary. In general, these subsurface systems include processes of varying complexity occurring in different parts of the domain of interest. These processes mostly take place on different spatial and temporal scales. It is extremely challenging to model such systems in an adequate way, accounting for the spatially varying and scale-dependent character of these processes. In this lecture, we will: · give an overview of possible utilization conflicts in subsurface systems and of how the groundwater is affected; · review several model coupling concepts with a focus on the author’s work in this field. The concepts are divided into temporal and spatial coupling concepts, where the latter are sub-divided into multi-process, multi-scale, multi-dimensional, and multi-compartment coupling strategies; · escribe the fundamental properties and functions of a compositional multi-phase system in a porous medium. The basic multi-scale and multi-physics concepts are introduced and conservation laws formulated; · explain the numerical solution procedures for both decoupled and coupled model formulations. Two applications of multi-physics and multi-scale algorithms will be presented and discussed; |
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תאריך 25/02/2018 12:00 23:00 |
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