1995
DOI: 10.1029/94wr02422
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Calculation of Internodal Transmissivities in Finite Difference Models of Flow in Heterogeneous Porous Media

Abstract: We present an analytical and numerical investigation of the finite difference computation of the equivalent conductivity of heterogeneous porous media. The customary harmonic scheme to evaluate finite difference internodal transmissivities produces a systematic bias in the numerical results unless an extremely fine grid is used. In order to quantify such effects, we have developed an analytical approach in the form of a series expansion of the equivalent numerical conductivity in powers of the conductivity var… Show more

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Cited by 98 publications
(53 citation statements)
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“…If the orientation of the fracture network is systematically skewed to the grid, or if the shapes of coarse blocks are irregular, a more advanced technique (i.e., one compatible with a multipoint flux approximation) may be required. Permeability upscaling and subsequent calculation of upscaled transmissibility (via weighted harmonic averaging of upscaled permeability) could also be applied, though direct transmissibility upscal-ing has been shown to provide better accuracy for highly heterogeneous systems [Romeu and Noetinger, 1995;Chen et al, 2003].…”
Section: Connections Between Coarse Blocksmentioning
confidence: 99%
“…If the orientation of the fracture network is systematically skewed to the grid, or if the shapes of coarse blocks are irregular, a more advanced technique (i.e., one compatible with a multipoint flux approximation) may be required. Permeability upscaling and subsequent calculation of upscaled transmissibility (via weighted harmonic averaging of upscaled permeability) could also be applied, though direct transmissibility upscal-ing has been shown to provide better accuracy for highly heterogeneous systems [Romeu and Noetinger, 1995;Chen et al, 2003].…”
Section: Connections Between Coarse Blocksmentioning
confidence: 99%
“…The numerical discretisation of these equation leads to the solution of the following linear system: (25) Romeu and Noetinger (1995) studied numerically and theoretically the preceding formulations on log normal uncorrelated media (i.e. in the present case, situations where the permeabilities of two distinct grid blocks are independent).…”
Section: About Numerical Determinations Of the Upscaled Parametersmentioning
confidence: 99%
“…The simplest idea was implemented in Romeu and Noetinger (1995), i.e. dividing each original grid block into r 2 equal square grid blocks of size δx/r having equal permeabilities, as sketched in Figure 3.…”
Section: About Numerical Determinations Of the Upscaled Parametersmentioning
confidence: 99%
“…On the other hand, it is generally recognized that upscaling of transmissibility is more accurate than upscaling of permeability for coarse scale flow simulation (Romeu and Noetinger, 1995;Urgelli, 1998). According to Darcy's law, the equivalent transmissibility T ij between two coarse gridblocks i and j can be determined by the quotient of equivalent flux F ij and the difference in coarse grid pressure p j -p i :…”
Section: Upscaling Of Absolute Permeabilitymentioning
confidence: 99%