A 2.75 D Finite Element Model of 3D Fracture Network Systems
Moenickes, Sylvia, Takeo Taniguchi, Rene Kaiser, Werner Zielke
Proceedings, 11th International Meshing Roundtable, Springer-Verlag, pp.161-168, September 15-18 2002
11th International Meshing Roundtable
Ithaca, New York, USA.
September 15-18 2002
Sylvia Moenickes, Rene Kaiser, Werner Zielke
Institute for Fluid Mechanics, ISEB,
Universitat Hannover, Hannover, Germany.
Faculty of Environmental Science and Technology,
Okayama University, Okayama, Japan
The simulation of fluid flow and heat transport in fracture network systems requires new grid generation techniques.
A fractured subsurface domain may be regarded as a convex 3 d domain split up into convex subdomains. When it
comes to hexahedrally meshing it there is still no method which provides overall simplicity, uniqueness, and robustness,
and furthermore good mesh quality near those fracture planes as they govern the phenomena. For these cases we
propose 2.75 d meshes. The basic idea is that the regions with steady state conditions need not be considered and,
consequently they need not be meshed at all. Those regions are located far from the fractures. Accordingly, the
2.75 d mesh is a skeleton of 3 d elements covering the fracture planes in the domain. These can thus be analytically
computed as layered hexahedral elements. Pre-requisites are a topological analysis of the domain and expertise in
fluid dynamics in order to properly decide about the space to be omitted.
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