Adaptive split-operator methods for modeling transport phenomena in porous medium systems |
| |
| Authors: | Sarah E Gasda |
| |
| Institution: | a Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599-7431, USA
b US Army Engineer Research and Development Station, ATTN: CEERD-HF-HG, 3900 Halls Ferry Rd., Vicksburg, MS 39180-6133, USA |
| |
| Abstract: | Split-operator methods are commonly used to approximate environmental models. These methods facilitate the tailoring of different approximation approaches to different portions of the differential operator and provide a means to split large coupled problems into pieces that are more amenable to parallel computation than the original fully-coupled problem. However, split-operator methods introduce an additional source of approximation error into the solution, which is typically either ignored or controlled heuristically. In this work, we develop two methods to estimate and control the error in split-operator methods, which lead to a dynamic adjustment of the temporal splitting step based upon the error estimators. The proposed methods are shown to yield robust solutions that provide the desired control of error. In addition, for a typical nonlinear reaction problem, the new methods are shown to reduce the solution error by more than two orders of magnitude compared to standard methods for an identical level of computational effort. The algorithms introduced and evaluated have widespread applicability in environmental modeling. |
| |
| Keywords: | Reactive transport Error estimation Error control Algorithms |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
