Papers › An efficient multiscale multigrid preconditioner for Darcy flow in high-contrast media
An efficient multiscale multigrid preconditioner for Darcy flow in high-contrast media
Changqing Ye, Shubin Fu, Eric T. Chung, Jizu Huang
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In this paper, we develop a multigrid preconditioner to solve Darcy flow in highly heterogeneous porous media. The key component of the preconditioner is to construct a sequence of nested subspaces W_ℒ⊂W_(ℒ-1)⊂⋯⊂W₁=Wₕ. An appropriate spectral problem is defined in the space of Wᵢ₋₁, then the eigenfunctions of the spectral problems are utilized to form Wᵢ. The preconditioner is applied to solve a positive semidefinite linear system which results from discretizing the Darcy flow equation with the lowest order Raviart-Thomas spaces and adopting a trapezoidal quadrature rule. Theoretical analysis and numerical investigations of this preconditioner will be presented. In particular, we will consider several typical highly heterogeneous permeability fields whose resolutions are up to 1024³ and examine the computational performance of the preconditioner in several aspects, such as strong scalability, weak scalability, and robustness against the contrast of the media. We also demonstrate an application of this preconditioner for solving a two-phase flow benchmark problem.
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