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FY2023 Site Sustainability Plan

Shu-Nyamboli, Chemanji M.

The Sandia National Laboratories site sustainability plan and its associated DOE Sustainability Dashboard data entries encompass Sandia National Laboratories contributions toward meeting the DOE sustainability goals. This site sustainability plan fulfills the contractual requirement for National Technology & Engineering Solutions of Sandia, LLC, the management and operating contractor for Sandia National Laboratories, to deliver an annual sustainability plan to the DOE National Nuclear Security Administration Sandia Field Office.

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TYPE Other Report YEAR 2022
DOIDOIOSTIOSTI

Xyce™ Parallel Electronic Simulator Users' Guide (V.7.6)

Keiter, Eric R.; Russo, Thomas V.; Schiek, Richard S.; Thornquist, Heidi K.; Mei, Ting M.; Verley, Jason V.; Aadithya, Karthik V.; Schickling, Joshua D.

This manual describes the use of the Xyce™ Parallel Electronic Simulator. Xyce™ has been designed as a SPICE-compatible, high-performance analog circuit simulator, and has been written to support the simulation needs of the Sandia National Laboratories electrical designers. This development has focused on improving capability over the current state-of-the-art in the following areas: (1) Capability to solve extremely large circuit problems by supporting large-scale parallel computing platforms (up to thousands of processors). This includes support for most popular parallel and serial computers. (2) A differential-algebraic-equation (DAE) formulation, which better isolates the device model package from solver algorithms. This allows one to develop new types of analysis without requiring the implementation of analysis-specific device models. (3) Device models that are specifically tailored to meet Sandia's needs, including some radiation-aware devices (for Sandia users only). (4) Object-oriented code design and implementation using modern coding practices. Xyce™ is a parallel code in the most general sense of the phrase—a message passing parallel implementation—which allows it to run efficiently a wide range of computing platforms. These include serial, shared-memory and distributed-memory parallel platforms. Attention has been paid to the specific nature of circuit-simulation problems to ensure that optimal parallel eficiency is achieved as the number of processors grows.

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TYPE SAND Report YEAR 2022
DOIOSTI

A general framework for substructuring-based domain decomposition methods for models having nonlocal interactions

Numerical Methods for Partial Differential Equations

D'Elia, Marta D.; Bochev, Pavel B.; Gunzburger, Max D.; Capodaglio, Giacomo; Klar, Manuel; Vollmann, Christian

A mathematical framework is provided for a substructuring-based domain decomposition (DD) approach for nonlocal problems that features interactions between points separated by a finite distance. Here, by substructuring it is meant that a traditional geometric configuration for local partial differential equation (PDE) problems is used in which a computational domain is subdivided into non-overlapping subdomains. In the nonlocal setting, this approach is substructuring-based in the sense that those subdomains interact with neighboring domains over interface regions having finite volume, in contrast to the local PDE setting in which interfaces are lower dimensional manifolds separating abutting subdomains. Key results include the equivalence between the global, single-domain nonlocal problem and its multi-domain reformulation, both at the continuous and discrete levels. These results provide the rigorous foundation necessary for the development of efficient solution strategies for nonlocal DD methods.

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TYPE Other Report YEAR 2022
DOIOSTIScopus
Results 2901–2925 of 96,771
Results 2901–2925 of 96,771