Conformal Hexahedral Mesh Coarsening by Agglomeration
Cargemel, Pierre, Youssef Mesri, Herve Guillard
23rd International Meshing Roundtable, Elsevier Ltd., pp.Research Note, October 12-15 2014
23rd International Meshing Roundtable
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Reservoir simulation involves to compute dynamic flow of different phases in a porous medium.
The initial state of the reservoir is usually precomputed via geo-statistics methods,
extrapolating measures of the terrain. so, the input of reservoir simulation is given as a
fine mesh containing heterogeneous data. However, due to the complexity of the system of partial
differential equations (PDE) governing the flow dynamic, the use of this fine mesh is impracticable.
Nowadays, industrial software uses upscaled model  a coarse mesh is generated homogenizing fine
properties from the fine mesh.
In this paper, we will describe an agglomeration strategy, to dynamically coarsen the fine mesh
without loss of the fine properties. The adaptivity may be driven by physics and/or geometric
estimators. Ideally, the coars- ening should be applied locally in low gradient regions, whereas
high gradient regions keep the fine mesh.
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