Hegde, C. ; Rühaak, W. ; Sass, I.
Hrsg.: Harish, B. S. ; Vinu, V. Das (2013)
Evaluation of Modelling of Flow in Fractures.
Fourth International Conference on Advances in Civil Engineering - AETACE. Delhi, India (13.12.2013-14.12.2013)
Konferenzveröffentlichung, Bibliographie

Kurzbeschreibung (Abstract)

Heat-transport is important for geothermal exploration. The presence of fractures can have a pronounced effect on groundwater and heat transfer.The inclusion of fractures into geothermal reservoir models on different scales is often still a difficult task. A comparison of approaches for flow in fractures has been carried out. A very simple approach is to simulate fractures with thin but highly conductive layers, for instance by applying the Cubic-Law. A more sophisticated approach, typically in FEM codes, is the application of lower dimensional (1D/2D) high permeable discrete elements with specific flow properties, following e.g. Hagen-Poiseuille or Manning-Strickler. However, such an approach typically fails while studying only partly saturated fractures. For studying the applicability of simplified fracture modellingapproaches a comparison with a CFD (Computational Fluid Dynamics) solution was performed. Furthermore a DEM (Discrete Element Method)approach has been illuminated. The various methodologies are studied by varying roughnesses,this way studying the versatility of the approach. The sensitivity of flow in fractures to various numerical parameters can be studied this way. A detailed analysis of temperature and flow using Péclet and Reynolds numbers helps to quantify the contributions of the different transfer processes.

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