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Evaluation of Modelling of Flow in Fractures

Hegde, C. and Rühaak, W. and Sass, I. (2013):
Evaluation of Modelling of Flow in Fractures.
In: 2013 Fourth International Conference on Advances in Civil Engineering - AETACE, ACEE, pp. 116-125, [Online-Edition: doi: 02.AETACE.2013.4.24],
[Article]

Official URL: doi: 02.AETACE.2013.4.24

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.

Item Type: Article
Erschienen: 2013
Creators: Hegde, C. and Rühaak, W. and Sass, I.
Title: Evaluation of Modelling of Flow in Fractures
Language: English
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.

Journal or Publication Title: 2013 Fourth International Conference on Advances in Civil Engineering - AETACE
Publisher: ACEE
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences
Date Deposited: 11 Nov 2015 18:14
Official URL: doi: 02.AETACE.2013.4.24
Additional Information:

Editor: Harish B S and Vinu V Das ISBN: 978-94-91587-04-7 Conference Venue: Delhi, India Conference Date: 13.-14.12.2013

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Alternative keywords:
Alternative keywordsLanguage
FracturesEnglish
Cubic LawEnglish
Discrete ElementsEnglish
Computational Fluid DynamicsEnglish
Finite Element MethodEnglish
Discrete Eleement MethodEnglish
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