Discretization on non-matching quadrilaterals in anisotropic and heterogeneous porous media

Use of non-matching quadrilateral grid cells within reservoir simulation occurs in connection witti local grid refinement and may also occur when modelmg faults. Accurate simulation of multi-phase porous-media flow also requires discretization techniques able to handle non-orthogonal grid cells, strong heterogeneities, and anisotropy witti arbitrary principal directions, in combination.