Mathematical Formulation Requirements and Specifications for the Process Models

Steefel, C. ; Moulton, D. ; Pau, G. ; Lipnikov, K. ; Meza, J. ; Lichtner, P. ; Wolery, T. ; Bacon, D. ; Spycher, N. ; Bell, J. ; Moridis, G. ; Yabusaki, S. ; Sonnenthal, E. ; Zyvoloski, G. ; Andre, B. ; Zheng, L. ; Davis, J.

Lawrence Berkeley National Laboratory

关键词: Management;    58;    Waste Forms;    Computers;    54;   

DOI  :  10.2172/1000859
RP-ID  :  LBNL-4085E
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  1000859

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Advanced Simulation Capability for Environmental Management (ASCEM) is intended to be a state-of-the-art scientific tool and approach for understanding and predicting contaminant fate and transport in natural and engineered systems. The ASCEM program is aimed at addressing critical EM program needs to better understand and quantify flow and contaminant transport behavior in complex geological systems. It will also address the long-term performance of engineered components including cementitious materials in nuclear waste disposal facilities, in order to reduce uncertainties and risks associated with DOE EM's environmental cleanup and closure activities. Building upon national capabilities developed from decades of Research and Development in subsurface geosciences, computational and computer science, modeling and applied mathematics, and environmental remediation, the ASCEM initiative will develop an integrated, open-source, high-performance computer modeling system for multiphase, multicomponent, multiscale subsurface flow and contaminant transport. This integrated modeling system will incorporate capabilities for predicting releases from various waste forms, identifying exposure pathways and performing dose calculations, and conducting systematic uncertainty quantification. The ASCEM approach will be demonstrated on selected sites, and then applied to support the next generation of performance assessments of nuclear waste disposal and facility decommissioning across the EM complex. The Multi-Process High Performance Computing (HPC) Simulator is one of three thrust areas in ASCEM. The other two are the Platform and Integrated Toolsets (dubbed the Platform) and Site Applications. The primary objective of the HPC Simulator is to provide a flexible and extensible computational engine to simulate the coupled processes and flow scenarios described by the conceptual models developed using the ASCEM Platform. The graded and iterative approach to assessments naturally generates a suite of conceptual models that span a range of process complexity, potentially coupling hydrological, biogeochemical, geomechanical, and thermal processes. The Platform will use ensembles of these simulations to quantify the associated uncertainty, sensitivity, and risk. The Process Models task within the HPC Simulator focuses on the mathematical descriptions of the relevant physical processes.