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Mesh Infrastructure for Coupled Multiprocess Geophysical Simulations

Garimella, Rao V. and William A. Perkins, Mike W. Buksas, Markus Berndt, Konstantin Lipnikov, Ethan Coon, John D. Moulton, Scott L. Painter

23rd International Meshing Roundtable, Elsevier Ltd., October 12-15 2014

IMR
PROCEEDINGS

23rd International Meshing Roundtable
London, UK
October 12-15,2014

Los Alamos National Laboratory, Los Alamos, NM USA
Pacific Northwest National Laboratory, Richland, WA USA
Stellar Science Ltd. Co., Albuquerque, NM USA
Email: rao@lanl.gov

Summary
We have developed a sophisticated mesh infrastructure capability to support large scale multiphysics simulations such as subsurface flow and reactive contaminant transport at storage sites as well as the analysis of the e ects of a warming climate on the terrestrial arctic. These simulations involve a wide range of coupled processes including overland flow, subsurface flow, freezing and thawing of ice rich soil, accumulation, redistribution and melting of snow, biogeochemical processes involving plant matter and finally, microtopography evolution due to melting and degradation of ice wedges below the surface. In addition to supporting the usual topological and geometric queries about the mesh, the mesh infrastructure adds capabilities such as identifying columnar structures in the mesh, enabling deforming of the mesh subject to constraints and enabling the simultaneous use of meshes of di erent dimensionality for subsurface and surface processes. The generic mesh interface is capable of using three di erent open source mesh frameworks (MSTK, MOAB and STKmesh) under the hood allowing the developers to directly compare them and choose one that is best suited for the applicationís needs. We demonstrate the results of some simulations using these capabilities as well as present a comparison of the performance of the di erent mesh frameworks.

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