Abstract
In this paper we study the problem of determining the effective permeability on a coarse scale level of problems with strongly varying and discontinuous coefficients defined on a fine scale. The upscaled permeability is defined as the solution of an optimization problem, where the difference between the fine scale and the coarse scale velocity field is minimized. We show that it is not necessary to solve the fine scale pressure equation in order to minimize the associated cost‐functional. Furthermore, we derive a simple technique for computing the derivatives of the cost‐functional needed in the fix‐point iteration used to compute the optimal permeability on the coarse mesh. Finally, the method is illustrated by several analytical examples and numerical experiments.
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Nielsen, B.F., Tveito, A. An upscaling method for one‐phase flow in heterogeneous reservoirs. A weighted output least squares (WOLS) approach. Computational Geosciences 2, 93–123 (1998). https://doi.org/10.1023/A:1011541917701
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DOI: https://doi.org/10.1023/A:1011541917701