\LDRD Final Report: Physical Simulation of Nonisothermal Multiphase Multicomponent Flow

This document reports on the accomplishments of a laboratory-directed research and development (LDRD) project whose objective was to initiate a research program for developing a fundamental understanding of multiphase multicomponent subsurface transport in heterogeneous porous media and to develop parallel processing computational tools for nwnerical simulation of such problems. The main achievement of this project was t5e successful development of a general-purpose, unstructured grid, multiphase thermal simulator for subsurface transport in heterogeneous porocs media implemented for use on massively parzllel (hPj zornputers via messagepassing and domain dwmiposition rechaiques. The numerical platform provides an excellent base for new and continuing project development in xcas of current interest to SNL ar,d the DOE complex including, subsurface nuclear waste disposal and cleanup, groundwater availability and contamination studies, fuel-spill transport for accident analysis, and DNAPL transport and remediation.