The Local Grid Refinement (LGR) option allows enhanced grid definition in areas needing a higher level of simulation accuracy, such as near wells or in areas of complex geology. Grid coarsening may be used to amalgamate cells in regions of the reservoir which are less important to speed up simulation run times.
Local grid refinements may be 2D radial, 3D radial, or 3D Cartesian, and the local models may have more layers than the global model. The properties of the cells in the local grid can be inherited from the global grid or specified explicitly. Transmissibilities between the local model and the global model are computed automatically by the Eclipse simulator.