Mixed and hybrid finite element methods
Mixed and hybrid finite element methods
Iterative solution methods
The numerical solution of diffusion problems in strongly heterogeneous non-isotropic materials
Journal of Computational Physics
SIAM Journal on Numerical Analysis
Enhanced Cell-Centered Finite Differences for Elliptic Equations on General Geometry
SIAM Journal on Scientific Computing
SIAM Journal on Scientific Computing
Journal of Computational Physics
Use of coordinate-free numerics in elastic wave simulation
Applied Numerical Mathematics
A Multipoint Flux Mixed Finite Element Method
SIAM Journal on Numerical Analysis
Journal of Computational Physics
A quasi-positive family of continuous Darcy-flux finite-volume schemes with full pressure support
Journal of Computational Physics
Coordinate-free numerics: all your variation points for free?
International Journal of Computational Science and Engineering
SIAM Journal on Scientific Computing
Journal of Computational Physics
Journal of Computational and Applied Mathematics
An improved monotone finite volume scheme for diffusion equation on polygonal meshes
Journal of Computational Physics
Hi-index | 31.45 |
A new family of cell-centered finite-volume schemes is presented for solving the general full-tensor pressure equation of subsurface flow in porous media on arbitary unstructured triangulations. The new schemes are flux continuous and have full pressure support (FPS) over each subcell with continuous pressure imposed across each control-volume sub-interface, in contrast to earlier formulations. The earlier methods are point-wise continuous in pressure and flux with triangle-pressure-support (TPS) which leads to a more limited quadrature range. An M-matrix analysis identifies bounding limits for the schemes to posses a local discrete maximum principle. Conditions for the schemes to be positive definite are also derived. A range of computational examples are presented for unstructured triangular grids, including highly irregular grids, and the new FPS schemes are compared against the earlier pointwise continuous TPS formulations. The earlier pointwise TPS methods can induce strong spurious oscillations for problems involving strong full-tensor anisotropy where the M-matrix conditions are violated, and can lead to decoupled solutions in such cases. Unstructured cell-centered decoupling is investigated. In contrast to TPS, the new FPS formulation leads to well resolved solutions that are essentially free of spurious oscillations. A substantial degree of improved convergence behavior, for both pressure and velocity, is also observed in all convergence tests. This is particularly important for problems involving high anisotropy ratios. Also the new formulation proves to be highly beneficial for an upscaling example, where enhancement of convergence is highly significant for certain quadrature points, clearly demonstrating further advantages of the new formulation.