... on the use of a generalized diffusivity equation, the validity of which has been the subject of recent debate. 2 In that formulation, the diffusivity was taken to be position-dependent. This reflects the long memory associated with random walks (diffusion) on fractal objects. Alternative approaches...

...D. Morel; B. Bourbiaux; M. Latil; B. Thiébot SUMMARY The combined effects of gas diffusion and stripping in the matrix blocks of light-oil fractured reservoirs subjected to methane or nitrogen gas flooding are experimentally studied with a specific automated apparatus. 1D and 3D experiments...

... finite difference or finite element methods. The large linear system arising from the mixed finite element discretization is solved efficiently by a multigrid method 11 . The equation for the saturation has a convection and diffusion part. The diffusion models the effect of capillary pressure...