|
Detailed Reference Information |
MacLachlan, S.P. and Moulton, J.D. (2006). Multilevel upscaling through variational coarsening. Water Resources Research 42: doi: 10.1029/2005WR003940. issn: 0043-1397. |
|
A new efficient multilevel upscaling procedure for single-phase saturated flow in porous media is presented. While traditional approaches to this problem have focused on the computation of an upscaled hydraulic conductivity, here the coarse-scale model is created explicitly from the fine-scale model through the application of operator-induced variational coarsening. This technique, which originated with robust multigrid solvers, has been shown to accurately capture the influence of fine-scale heterogeneous structure over the complete hierarchy of coarse-scale models that it generates. Moreover, implicit in this hierarchy is the construction of interpolation operators that provide a natural and complete multiscale basis for the fine-scale problem. Thus this new multilevel upscaling methodology is similar to the multiscale finite element method, and indeed, it attains similar accuracy in computations of the fine-scale hydraulic head and coarse-scale normal flux on a variety of problems; yet it is an order of magnitude faster on the examples considered here. |
|
|
|
BACKGROUND DATA FILES |
|
|
Abstract |
|
|
|
|
|
Keywords
Hydrology, Computational hydrology, Hydrology, Monitoring networks, Hydrology, Numerical approximations and analysis |
|
Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
|
|
|