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Digitale Medien

Wavelet upscaling based on piecewise bilinear approximation of the permeability field (1996)

Nilsen, Stein ; Espedal, Magne S.

Springer

Transport in porous media 23 (1996), S. 125-134

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ISSN: 1573-1634

Schlagwort(e): permeability ; upscaling ; flow prediction

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Technik allgemein

Notizen: Abstract A method for upscaling of permeability in heterogeneous porous media is presented. The upscaled field takes the form K = e Y , where Y, in two dimensions, is a piecewise bilinear function. The method is tested on a number of random permeability fields, with different integral scale/correlation length and variance. The numerical results show that this method conserves much more of the heterogeneous fingering than classical block-based upscaling methods, e.g., geometric mean.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00178122

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Digitale Medien

On the numerical solution of non-linear reservoir flow models with gravity (1995)

Hansen, Ragnhild ; Espedal, Magne S.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 38 (1995), S. 2017-2032

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ISSN: 0029-5981

Schlagwort(e): reservoir flow ; non-linear model ; gravity ; operator-splitting ; method of characteristics ; Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: Based on a two-phase fluid model for immiscible displacement in a porous medium, we develop and analyse numerical solution techniques for certain non-linear phenomena. Two different solution strategies for the treatment of gravity effects, which are non-trivial to model by existing solution techniques and may be of great influence in many practical flow situations, are presented. The solution procedures are based on an operator-splitting technique, combining the modified method of characteristics with finite element techniques and adaptive grid refinement.

Zusätzliches Material: 10 Ill.