11.4.1 Block-Centered Cells

Block-centered cells are cells with no corner nodes and no explicit geometry. In other words, the grid is indexed as described in Section 11.3 Grid Topology , but no geometry is attached to any of the nodes of the cells of the grid.

This grid type is used to represent the newest reservoir simulation formats, but also the oldest. Instead of an explicit geometry, equivalent properties are specified on the grid, for example, pore volume and transmissibility, or perhaps equivalent cell dimensions: DX, DY, and DZ. Any grid class may be block-centered, with the exception of the two truncated grids, which are constrained to have explicit geometry.