A NEW GHOST-NODE METHOD FOR LINKING DIFFERENT MODELS WITH VARIED GRID REFINEMENT

dickinson, J. ; James, S.C. ; Mehl, S. ; Hill, M.C. ; Leake, S. ; Zyvoloski, G.A.

United States. Department of Energy. Yucca Mountain Project Office.

关键词: 99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Hydrology;    Ground Water;    Coupling;    58 Geosciences;   

DOI  :  10.2172/884931
RP-ID  :  NA
RP-ID  :  NA
RP-ID  :  884931

美国|英语

来源: UNT Digital Library

【 摘 要 】

A flexible, robust method for linking grids of locally refined models that may be constructed using different types of numerical methods is needed to address a variety of hydrologic problems. This work outlines and tests a new ghost-node model-linking method based on the iterative method of Mehl and Hill (2002, 2004). It is applicable to steady-state solutions for ground-water flow. Tests are presented for a homogeneous two-dimensional system that facilitates clear analysis of typical problems. The coupled grids are simulated using the finite-difference and finite-element models MODFLOW and FEHM. Results indicate that when the grids are matched spatially so that nodes and control volume boundaries are aligned, the new coupling technique has approximately twice the error as coupling using two MODFLOW models. When the grids are non-matching; model accuracy is slightly increased over matching grid cases. Overall, results indicate that the ghost-node technique is a viable means to accurately couple distinct models.